~"CREATE_MESSAGE_MODULE OSM$SYSTEM_ATTRIBUTE$US_ENGLISH
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEFAULT_ATTRIBUTE_HELP
                  Generic NEPTUN System Attribute Help

  There is no individual Help for System Attribute ~P1.
  Please contact the SPAM Manual or contact the person responsable for
  the NEPTUN Development.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ABORTED_TASK_THRESHOLD
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of tasks that can abort in a given CPU before the
  system attempts to discontinue the use of that CPU in a multiple-CPU
  environment or attempts to execute a STEP_SYSTEM command in a single-CPU
  environment.

  Use this system attribute when detected uncorrected errors (DUEs) are
  encountered in NEPTUN job mode.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ADVISE_IN_LIMIT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum number of Active IO Requests for a job.
  Memory Manager skips the rest of the current advise in user request, when
  a process ends up having over ~P2 Active IO Requests.
  The system does not try to readvise remaining pages. A normal page fault
  will occure when they are used.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AGE_INTERVAL_CEILING
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  ~P1 is now maintainable by the CHANGE_MEMORY_ATTRIBUTE
  subcommand of the MANAGE_MEMORY utility.

  ~P1 is used in Aging the Job Working Set.
  Every page in the JWS with a higher age than ~P2 will be removed
  during JWS aging.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AGE_INTERVAL_FLOOR
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  ~P1 is now maintainable by the CHANGE_MEMORY_ATTRIBUTE
  subcommand of the MANAGE_MEMORY utility.

  ~P1 is used in Aging the Job Working Set.
  A maximum of one page in the JWS with a higher age than ~P2 will be
  removed during JWS aging.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ALLOW_JR_TEST
               ~P1 NEPTUN System Attribute Help

  Internal System Attribute ~P1:

  ~P1 can be used to cause hangs and crashes during job recovery and
  other situations for testing purposes.

  When this attribute is set to 1, the system or the job will crash or hang
  at several locations. Each individual situation can additionally be
  enabled/disabled by the syv$test_jr_system and syv$test_jr_job
  variables or set_job_recovery_test command.

  Additionally, most of the code that checks the attribute is NOT
  included in a normal system build and must be compiled with the
  DEBUG compile variable set to ON.
  Also some parts are only available through the TEST_HARNESS template.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ACCOUNT_LOG_CRITICAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the action NEPTUN takes when it is unable to record an entry
  in the account log.

  If the value of this system attribute is 1, NEPTUN terminates any time
  the system is unable to record an entry.

  If the value of this system attribute is 0, NEPTUN discards the entry
  and informs the operator by way of a message in the critical display window.

  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ACCOUNT_LOG_MAXIMUM_SIZE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum size, in megabytes, of the account log.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ACQUIRE_PP_FOR_REDUNDANT_CH
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether a peripheral processor (PP) is assigned to every mass
  storage channel defined in the physical configuration.

  If the value of this system attribute is 1, a PP is assigned to every
  mass storage channel defined in the physical configuration.

  If the value of this system attribute is 0, a PP is assigned to mass
  storage channels that have an active path to a mass storage unit.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AGE_BEFORE_SWAP_PERCENTAGE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the percentage of the job's minimum working set that is aged
  to free memory for another job.

  If enough memory is retrieved from the job's minimum working set, the
  job is not swapped.

  If the value of this attribute is 0, the job's minimum working set is not
  used when freeing memory.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AGE_JWS_BEFORE_SWAP
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether an attempt is made to age the job working set to retrieve
  memory before swapping the job.

  If the attribute is set to TRUE, the working set of the job selected to be
  swapped out is aged to try to free enough memory. A job working set is
  not aged below its minimum working set unless the AGE_BEFORE_SWAP_PERCENTAGE
  system attribute is set to a non-zero value.

  In some instances the PAGE_AGING_INTERVAL and other aging parameters
  effectively turn off aging job working sets by setting the parameters
  to large values. As a result, working sets can be artificially high,
  containing pages that are no longer used.
  Aging such a job working set frees memory without causing the job's page
  faults to increase. To reduce swapping overhead, set the ~P1
  attribute to TRUE.
  To leave all pages in the working set, set the ~P1
  attribute to FALSE.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AUTO_RECONFIGURATION
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the action taken when a PP driver requests the disabling of a
  disk channel, controller, or mass storage unit.

  If the value of this system attribute is 1, NEPTUN attempts to locate
  redundant and/or alternate paths to the mass storage units affected by
  disabling the element. The configuration is modified to route future
  I/O requests along the redundant path. A message informs the operator
  what configuration changes are made.

  If the value of this system attribute is 0, NEPTUN disables all mass
  storage units affected by disabling the element. If any of the affected
  units are considered critical, the system is stepped.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AUTOMATIC_PP_RELOAD
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether the system is to reload a hung PP.

  A value of 0 disables dynamic reloading of a PP.

  The system reloads SCI or a disk driver only into the PP that hangs.
  The system reloads a communication driver into any available PP.
  If a hung PP cannot be reloaded, the operator is notified or the system
  is stepped. Each time a PP is hung and dynamically reloaded, the system
  records a statistic in the engineering log.

  The system automatically disables dynamic reloading of hung PPs if you
  reconfigure the PPs. The system also disables dynamic reloading if the
  same PP fails three times during an hour.

  If a PP repeatedly hangs, disable dynamic reloading so the next
  time the PP hangs a system dump can be taken and the condition
  analyzed.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AUTOMATIC_SYSTEM_RESTART
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies automatic or manual mode of system restart on a CYBER 2000
  mainframe.

  When this attribute is set to automatic, the service processor
  automatically restarts NEPTUN when a system interruption that is caused by
  a transient, system-level failure occurs.

  When this attribute is set to manual, the operator or analyst must restart
  the system.

  If the value of this system attribute is 1, the system is set to automatic.
  If the value is 0, the system is set to manual.

  A service processor menu specifies the default value for this system
  attribute.


  NOTE:
    I do not recommend to change this value! I haven't figured out what
    the Service Processor is really doing. Sometimes it seems to try to
    restart anyway but I haven't seen a case, where it worked at all!


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AUTOMATIC_UNSTEP_RESUME
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies automatic or manual mode of system resumption.

  When this attribute is set to automatic, the system automatically resumes
  operations after an environmental condition has caused system suspension.

  When this attribute is set to manual, resumption of operations is left up
  to the operator or analyst.

  For further information about system suspension and resumption, see the
  NEPTUN Operations manual.

  If the value of this system attribute is 1, the system is set to automatic.
  If the value is 0, the system is set to manual.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CHECK_IDLE_DISPATCHING_INTERVAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the interval at which the system checks whether any dispatching
  priority queues are idle (nondispatchable) and whether any previously
  idle dispatching queues are now dispatchable.

  A dispatching priority queue is considered idle if the dispatcher has not
  tried to dispatch any tasks of that dispatching priority in the length of
  time defined by the IDLE_DISPATCHING_QUEUE_TIME scheduling attribute
  (described in SPAM chapter 4, Job Scheduling).
  The dispatcher does not attempt to dispatch tasks of a certain dispatching
  priority if tasks with a higher dispatching priority are CPU-bound.
  All jobs in an idle dispatching priority queue are swapped out.

  If a dispatching priority queue was previously idle and is now dispatchable,
  jobs of that dispatching priority that were swapped out will be swapped back
  in.

  The interval defined by this system attribute is checked within the NEPTUN
  memory manager, which is called at intervals established by the
  PERIODIC_CALL_INTERVAL memory attribute (described in SPAM chapter 3,
  Managing Memory).
  Accordingly, the value of the ~P1 system
  attribute should always be greater than the value of the
  PERIODIC_CALL_INTERVAL memory attribute.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CLUSTER_ATTACH_JOB_ENABLED
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether, for sites configured in a cluster, a job executing
  on one mainframe can attach a disconnected job for the same user on
  another mainframe.

  If the value for this attribute is 1, the disconnected job can be attached.
  If the value is 0, the disconnected job cannot be attached.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=COMMAND_STATISTICS_ENABLED
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether the command resources statistic (CL2) can be
  activated and collected.
  (The CL2 statistic is described in SPAM chapter 9, Statistics Facility.)

  If the value of this system attribute is 1, the CL2 statistic can be
  collected.
  If its value is 0, the CL2 statistic is not collected.

  NOTE:
    Activating the CL2 statistic generates a large amount of data;
    the resulting overhead can degrade system performance.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CONSTRAIN_MEAPE_SEGMENTS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether to allow any MEASURE_PROGRAM_EXECUTION task
  to continue processing after it has filled one segment with
  collected data. The MEASURE_PROGRAM_EXECUTION task is documented
  in the NEPTUN Object Code Management manual.

  If the value of this system attribute is 1, the MEASURE_PROGRAM_EXECUTION
  task aborts at the point where it requests its second segment.

  If the value of this system attribute is 0, the MEASURE_PROGRAM_EXECUTION
  task is allowed to open and write data to as many segments as are necessary
  for completion.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CRITICAL_WINDOW_LOG_CRITICAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the action NEPTUN takes when it is unable to record an entry
  in the critical window log.

  If the value of this system attribute is 1, NEPTUN terminates any time
  the system is unable to record an entry.
  If the value of this system attribute is 0, NEPTUN discards the entry.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CRITICAL_WINDOW_LOG_MAX_SIZE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum size, in megabytes, for the critical window log.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEFAULT_DEBUG_OUTPUT_DISPOSAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the disposition of output generated by system core debugger
  commands.

  This attribute can be set to one of the following values:

  0: Output is sent to the system console during execution of a command.
     This is the default.
  1: Output is sent to the printer upon completion of the session or command.
  2: Output is retained in the $SYSTEM.DUMPS catalog upon completion of the
     session or command.
  3: Output is sent to the printer and is also retained in the
     $SYSTEM.DUMPS catalog on completion of the session or command.

  Disposition of output from a DUMPJOB session or the AUTO command is
  handled differently from that produced by other commands.
  If the value of the ~P1 system attribute is 0,
  output is handled according to the disposition selected for the DUMPJOB
  session or the AUTO command.
  For all other values of the ~P1 system attribute,
  the attribute takes precedence.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DELETE_OLD_TEMPLATES
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether the system deletes the current disk image of the system
  and recreates it from the deadstart tape. Deleting the current disk image
  includes deleting the system binding and code segments.

  If the value of this attribute is 0, the system keeps the current disk
  image of the system.

  If the value is 1, the system deletes the current disk image of the system
  and then recreates it from the deadstart tape. Specify a value of 1 when
  unrecovered read errors for system binding or code segments are logged
  in the job or system log.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DELETE_UNRECONCILED_FILES
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether NEPTUN deletes catalogs and permanent file cycles
  that are known either to permanent file management or to device management,
  but not to both, during the permanent file recovery phase of a continuation
  deadstart.
  This system attribute applies to all mass storage sets that are active
  at deadstart time.

  If the value of this system attribute is 1, NEPTUN deletes unreconciled
  catalogs and permanent file cycles during permanent file recovery.

  If the value is 0, catalogs and file cycles are not deleted as a result of
  being unreconciled.

  If this system attribute is set to 1, it is possible that more disk space
  will be available following deadstart than if the attribute were set to 0.
  Set this system attribute to 1 only when all disks in the set are set to ON
  and can be accessed through channels and controllers that are also set to
  ON; otherwise files or catalogs may be lost.

  If you set the ~P1 system attribute to 1 when a
  catalog volume is missing, you delete all catalogs subordinate to the
  missing catalogs and all files described by the missing catalogs and
  deleted catalogs.

  If you do a continuation deadstart following a system crash that did not
  recover the memory image (see the IGNORE_IMAGE system attribute), there
  may be catalogs and permanent files that are known to device management
  but not to permanent file mangement. This is more likely to happen if
  the system crashes while attempting to deadstart without recovering
  active jobs (see the JOB_RECOVERY_OPTION system attribute). If this
  situation occurs, you may want to delete these catalogs and permanent
  files by setting the ~P1 system attribute to 1 at
  the next continuation deadstart.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DETAILED_CRITICAL_DISPLAYS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether to route informative messages generated during job
  recovery to the critical display window as well as the system log.
  The routed messages inform the operator of job recovery status, alerting
  the operator to jobs that cannot be recovered.

  It also allows to select some trace messages during disk activation.

  The following values can be set:

  0: No extra messages are written to the Critical Window Log.

  1: Job recovery errors are written to the Critical Window Log.

  2: Configuration Messages are additionally written to the
     Console Output Window.

  3: Disk Activation Messages are additionally written to the
     Critical Window Log.

  NOTE:
    This documentation is incomplete and needs to be updated.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DISDELAY
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies how often the system refreshes the system console displays.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DUMP_WHEN_DEBUG
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether the automatic dump command list is to be executed
  when the system core debugger is called into a task because of an error
  condition.

  If the value of this system attribute is 1, the automatic dump
  command list is executed. The NEPTUN monitor initiates the normal
  action for the fault when the dump completes.

  If the value of this system attribute is 0, no dump is initiated.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DYNAMIC_FILE_SPACE_LIMITS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether to enable dynamic file space limits.

  If the value of this attribute is 1, dynamic file space limits are
  checked.

  If the value is 0, no checking takes place. When this attribute is
  disabled, the system can continue running when end cases occur.
  During development, this attribute can be disabled; in a production
  environment, this attribute should be enabled.

  NOTE:
    There is extra overhead for every file extend to update the limits
    in Monitor. Therefore I recommend to disable the attribute when
    temporary file space is not an issue.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ENABLE_CONSOLE_BELL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether to enable the bell at the system console.

  If the value of this system attribute is 1, NEPTUN enables the
  console bell.

  If the value of this system attribute is 0, NEPTUN turns the console
  bell off.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ENABLE_HEAD_SHIFT_MESSAGE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether DAS head shift messages should be sent to the system
  console.

  If the value of this system attribute is 1, the message is posted in
  the critical window and an operator action message is posted requiring
  operator acknowledgement.

  The message is also logged for HPA processing. If the value of this
  system attribute is 0, the message is not sent to the system consol but
  it is still logged for HPA processing.

  NOTE:
    This documentation is incomplete and needs to be updated.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ENABLE_USER_DISPLAYS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether to enable a subset of NEPTUN console displays for all
  users.

  If the value of this system attribute is 1, the VE_DISPLAY command is
  accessible from within the SYSTEM_OPERATOR_UTILITY (SOU) by all users.

  If the value of this system attribute is 0, the VE_DISPLAY command is
  accessible from within the SOU only by users with specific capabilities.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ENGINEERING_LOG_CRITICAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the action NEPTUN takes when it is unable to record an entry in
  the engineering log.

  If the value of this system attribute is 1, NEPTUN terminates any time the
  system is unable to record an entry.

  If the value of this system attribute is 0, NEPTUN discards the entry and
  informs the operator by way of a message in the critical display window.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ENGINEERING_LOG_MAXIMUM_SIZE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum size, in megabytes, of the engineering log.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=FILE_SERVER_DEBUG_ENABLED
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Normally, this system attribute should be set to 0. It is used
  primarily as a debugging aid to test the file server.

  If the value of this system attribute is 1, detailed messages are displayed
  at the system console or written to the job log when significant or unusual
  events occur concerning the file server.

  If the value of this system attribute is 0, no file server related messages
  are displayed or logged.

  NOTE:
    When this system attribute is set to 1, the NEPTUN monitor halts if file
    server related errors occur that are considered unrecoverable or critical.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=FILE_SERVER_Q_TIMEOUT_INTERVAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the length of time a file server task request can block a
  request buffer.

  If NEPTUN determines the request buffer is blocked for the set length of
  time, it times out the owner of the blocking request. If the owner is not
  the current mainframe, NEPTUN attempts to queue the next task request.
  NEPTUN writes messages about the timeout in the system log and job log
  of the task blocking the request buffer.
  If the system attribute FILE_SERVER_DEBUG_ENABLED is set to 1 (TRUE),
  the system console also displays the messages.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=FILE_SERVER_RECOVERY_ENABLED
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether jobs using the file server should attempt to recover
  following a client mainframe failure.

  If the value of this system attribute is 1, jobs using the file server
  attempt to recover. In this case, the server mainframe saves any files
  that were attached by jobs on the client mainframe. Access to these files
  continues when the connection from the client mainframe to the server
  mainframe is reestablished.

  If the value of this system attribute is 0, jobs using the file server
  do not attempt to recover. In addition, no file server recovery takes
  place if the JOB_RECOVERY_OPTION system attribute is set to 3 (do not
  recover active jobs) or the image file is unavailable.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=HALT_ON_HUNG_TASK
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether a hung task causes the NEPTUN monitor to halt. This system
  attribute is used primarily for debugging software problems.

  If the value of this system attribute is 1, a hung task causes the NEPTUN
  monitor to halt.

  If the value of this system attribute is 0, the NEPTUN monitor sends the
  hung task a signal that causes it to go into an infinite wait loop.

  Unless you are debugging system problems, set this system attribute to 0.
  The status field on the VEDISPLAY ACTIVE_JOBS display for the job shows *H,
  indicating a hung task. The job, however, does not terminate. Therefore,
  all resources being used by the job (such as files and tapes) remain
  assigned.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=HALT_ON_PROCESSOR_MALFUNCTION
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether the NEPTUN system terminates when a processor has a
  hardware error that cannot be corrected.

  This system attribute is used primarily for debugging hardware problems.

  If the value of this system attribute is 1, the system terminates when
  an uncorrectable error occurs.

  If the value of this system attribute is 0, the system retries tasks and
  terminates those tasks that are affected by the hardware error.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=HALT_ON_SWAPIN_FAILURE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether bad swap file descriptor data causes the NEPTUN
  monitor to halt.

  If the value of this system attribute is 1, bad swap file descriptor
  data causes the NEPTUN monitor to halt.

  If the value of this system attribute is 0, the NEPTUN monitor kills
  the job associated with the corrupt swap file descriptor data, and the
  monitor continues to run. In addition, a message indicating that
  the job is dead is sent to the critical display window of the NEPTUN
  console, the job is swapped out of memory, and the memory associated
  with the job is freed.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=HALTRING
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies a P register ring number. A broken task or MCR fault occurring
  in a ring with a ring number less than or equal to the value of this system
  attribute causes the NEPTUN monitor to halt. (For more information on broken
  tasks and MCR faults, refer to SPAM appendix D, NOS/VE Processing of Job
  Mode Software Errors.)

  Broken tasks occurring in rings with ring numbers greater than the value
  for the ~P1 system attribute cause a monitor fault to be sent back to
  the task in job mode.

  This system attribute is used primarily for debugging software problems.
  Do not change the default value for the ~P1 system attribute during
  normal NEPTUN operations, including deadstart. If you change this value,
  the system may abort due to an error it would normally tolerate.

  Change the value of ~P1 only when producing a memory dump for a
  particular failure and only at the direction of a site analyst.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=HISTORY_LOG_CRITICAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the action NEPTUN takes when it is unable to record an entry
  in the history log.

  If the value of this system attribute is 1, NEPTUN terminates any time
  the system is unable to record an entry.

  If the value of this system attribute is 0, NEPTUN discards the entry and
  informs the operator by way of a message in the critical display window.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=HISTORY_LOG_MAXIMUM_SIZE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum size, in megabytes, of the history log.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=IGNORE_MAGE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  If the value of this system attribute is 1, the system disables the
  recovery of modified pages from a memory image during a continuation
  deadstart.

  If the value of this system attribute is 0, the system uses the memory
  image during a continuation deadstart.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=JOB_RECOVERY_OPTION
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether the system is to recover active jobs at continuation
  deadstart. Active jobs are those jobs that are initiated before the system
  terminates.

  You can specify one of two values for this system attribute: 0 or 3.

  0: Recover active jobs. Jobs that are initiated before the system terminates
     are recovered on this continuation deadstart. Recovered jobs continue
     execution from the point at which they were left when the system
     terminated.

  3: Do not recover active jobs. Jobs that are initiated before the system
     terminates are discarded on this continuation deadstart. The job name of
     each discarded job appears in the system log.


  All jobs are unrecoverable under any of the following conditions: 

  * The system fails and a recovery without image is performed.
  * An active massstorage volume is disabled at the time a TERMINATE_SYSTEM
    command is executed.
  * A deadstart is performed using a different version ofNEPTUN than was in
    use when the system last went down. (When you new system is binary
    compatible with the old system, you can set the system attribute
    RECOVERY_OVERRIDE to 1 to still recover the system.)
  * The operator has disabled job recovery via an operator command during
    deadstart. 
  * The system page size has been changed since the last deadstart.


  A single job is unrecoverable under any of the following conditions: 

  * Inconsistencies exist in NEPTUN data structure job descriptions.
  * The system is performing critical operations (for example, task initiation,
    task termination, or permanent file attaches).
  * The job has opened amagnetic tape file and a tape unit is currently
    assigned to the job.
    A job that has tape units reserved but not assigned is recoverable. Also,
    a job that has opened a magnetic tape file but is waiting for a tape to
    be mounted is recoverable.
  * A permanent file that the job was usingprior to the system failure
    cannot be reattached. (A permanent file that was deleted while it was
    attached does not prevent recovery of a job.)
  * The JOB_RECOVERY_DISPOSITION parameter for the job has a value other
    than CONTINUE. This parameter is controlled by the CHANGE_JOB_ATTRIBUTES,
    CHANGE_JOB_ATTRIBUTE_DEFAULT, LOGIN, JOB, and SUBMIT_JOB commands.
    With the exception of CHANGE_JOB_ATTRIBUTE_DEFAULT (described in the
    NEPTUN Operations manual), these commands are described in the NEPTUN
    Commands and Functions manual.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=LOG_SECURE_PARAMETERS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Controls logging of parameters of unknown commands to prevent logging of
  secure parameters.

  If the value of this system attribute is 1, the command name and
  parameters are logged.

  If the value of this system attribute is 0, only the name of the unknown
  command is logged.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=LONG_WAIT_FORCE_SWAP_TIME
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies an ultimate time limit for jobs to remain in memory when all
  tasks in the job are in wait state (that is, when they are in a timed wait
  or queued for certain resources) and when the expected wait time is less
  than the value specified by the LONG_WAIT_SWAP_TIME system attribute.

  If the time since the job was last executed exceeds the value set by
  ~P1, the job is swapped out. However, job swapping
  does not occur if the SWAP_JOBS_IN_LONG_WAIT system attribute is set to
  0 (FALSE).


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=LONG_WAIT_SWAP_TIME
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Determines whether a job's expected wait time causes it to be swapped
  out. That is, a job is swapped out if the time it is expected to wait
  exceeds this value.

  The following are instances of how a job goes into wait state:

  * After issuing a call to procedures PMP$WAIT or
    OSP$AWAIT_ACTIVITY_COMPLETION.

  * After issuing an SCL WAIT command.

  * When, in an interactive session, the terminal is waiting fo rinput.
    This is also referred to as think state. In this case, the job is
    always in long wait.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=VERIFY_TFT_BEFORE_CLEANUP
               ~P1 NEPTUN System Attribute Help

  The System Attribute ~P1
  (= Verify Task File Table Before Cleanup) is a Boolean Debug Variable.

  The variable has the following effects:

  FALSE or 0 : No special action to verify the integrity of the Task File
               Table during Task Termination is taken.

  TRUE  or 1 : The Task File Table is verified at Task Termination
               in PMP$CLEANUP_LOADED_RINGS before BAM is advised to
               cleanup the loaded rings.
               A Recoverable System Error is caused when the TASK FILE TABLE
               appears to be bad.

               The Task File Table is verified in the following way:

               Local_File_Name         :  must be a legal Path Handle.
               Sequence_Number         :  must be in the proper range.
               Access_Level            :  must be a legal access level.
               Open_Ring               :  must be a legal ring number.
               Privat_Read_Information :  must be readable.
               Privat_Read_Information :  must be readable.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAX_TIME_SWAP_IO_NOT_INIT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum amount of time a job swapped out for long wait remains
  in real memory without swapout I/O taking place after it has exceeded its
  estimated think time.
  Estimated think time is described in the MAXIMUM_THINK_TIME system attribute
  description.

  Until the time specified by this system attribute elapses, the job is
  logically swapped but remains memory-resident. After the time specified
  by this system attribute elapses, the job is written to disk. Its
  memory is not freed, however, until it has exceeded its estimated think
  time by the value set by the MAXIMUM_SWAP_RESIDENT_TIME system
  attribute.

  The job is swapped to disk and its memory freed anytime the
  number of free and available pages falls below the value specified by
  the MINIMUM_AVAILABLE_PAGES memory attribute (described in SPAM chapter 3,
  Managing Memory).

  If you have a large memory system (that is, greater than 256 megabytes),
  you may have to adjust the value of this attribute for optimum performance.
  Refer to the chapter called Handling Bottlenecks in the System for more
  information on tuning large memory systems.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXIMUM_ACTIVE_JOBS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum number of jobs that can be active in memory at any
  one time. If this limit is reached, no additional jobs are started or
  scheduled for execution until an active job terminates or is swapped out
  of memory.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXIMUM_ALLOCATION_SIZE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum allocation size, in bytes, assigned to new files.
  A file creation request (for example, REQUEST_MASS_STORAGE) that specifies
  an allocation size greater than the current value of the
  ~P1 system attribute is automatically reduced to the
  value of this system attribute.

  Whenever a file overflows to a new volume, NEPTUN requires that the new
  volume supports the allocation size defined for that file. The default file
  allocation size is 16,384 bytes (16 kilobytes), for which all disks
  support overflow with no wasted space.

  All disks support overflow with some wasted space for file allocation sizes
  of 32, 64, or 128 kilobytes. For file allocation sizes of 256 kilobytes,
  512 kilobytes, or a full cylinder, not all disks can be used for overflow.
  A file can overflow to any disk that supports an allocation size equal to
  or greater than the file's allocation size. A file cannot overflow to a
  disk that has a cylinder size less than the file's allocation size.

  If your site has model 844 or 834 disk units along with other types of disk
  units, you may want to change the value of the ~P1
  system attribute to 131,072 bytes. This allows the 844 and 834 disk units to
  be used for overflow of files from other disk types.

  To minimize overflow conflicts, NEPTUN limits a file's maximum allocation
  size to the current value of the ~P1 system attribute.
  This attribute's default value of 262,144 bytes maximizes I/O performance
  for a file with a large allocation size while minimizing overflow conflicts.
  If the ~P1 system attribute is set to a value greater
  than the cylinder size for a particular disk device, the system considers
  the maximum allocation size to be the cylinder size for files on that disk.
  See table 2-2 of SPAMM for the allowable values and default value for
  this system attribute.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXIMUM_JOB_CLASSES
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum number of job classes that can be defined. For
  information on defining job classes, refer to the CREATE_CLASS subcommand
  of the ADMINISTER_JOB_CLASS subutility in SPAMM chapter 4, Job Scheduling.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXIMUM_KNOWN_JOBS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum number of simultaneous jobs. This maximum is the
  total number of active batch jobs, batch jobs that have been queued
  for execution, interactive jobs, detached jobs, and jobs destined for
  QTF (Queue File Transfer Facility) or NTF (Network Transfer Facility).

  Interactive jobs submitted after this limit is reached are rejected by
  NEPTUN, causing one of the following error messages (depending on the
  job's network access method) to be issued to the terminal: 

  NAM issues the following message:
    ILLEGAL APPLICATION 

  INTERCOM issues the following message:
    CONNECTION TO VEIAF REJECTED

  NAMVE/CDCNET issues the following message:
    The job resources are temporarily unavailable


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXIMUM_OUTPUT_FILES
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum number of output files that can be queued for transfer
  to the batch transfer facility on NEPTUN standalone systems, to NOS
  (or NOS/BE), and/or to QTF on dual-state systems.

  An output file is either a file that contains the output and log files
  from a job, or a file routed with a PRINT_FILE command.

  If this maximum is reached, additional PRINT_FILE requests are rejected.
  However, the system routes output and log files as soon as the number of
  queued files falls below the maximum specified.

  NOTE:
    Setting the value of this system attribute too low can severely
    degrade system performance.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXIMUM_SERVICE_CLASSES
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum number of service classes that can be defined.
  For information on defining service classes, refer to the CREATE_CLASS
  subcommand of the ADMINISTER_SERVICE_CLASS subutility in SPAMM chapter 4,
  Job Scheduling.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXIMUM_SWAP_RESIDENT_TIME
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum amount of time a job in long wait remains in real
  memory with a swapped-out status (that is, the job is written to disk and
  a copy remains in real memory) after it has exceeded its estimated think
  time.
  Estimated think time is defined under the MAXIMUM_THINK_TIME system
  attribute description.
  After the time specified by this system attribute elapses, the job is
  removed from memory.

  The job's memory is freed anytime the number of free and available pages
  falls below the value specified by the MINIMUM_AVAILABLE_PAGES memory
  attribute (described in SPAMM chapter 3, Managing Memory).

  If you have a large memory system (that is, greater than 256 megabytes),
  you may have to adjust the value of this attribute for optimum performance.
  Refer to the SPAMM chapter called Handling Bottlenecks in the System for
  more information on tuning large memory systems.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXIMUM_THINK_TIME
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  For interactive jobs, think time is the amount of time it takes a user to
  enter the next input. While the job is waiting for input, the job is in
  long wait.

  The system calculates a new estimated think time whenever a job comes out of
  long wait. It is calculated as follows:

    1.  The think time is set equal to the time the system waited for terminal
        input.

    2.  The think time is then compared with the values specified by the
        MINIMUM_THINK_TIME and ~P1 system attributes. 

        If the think time is less than the MINIMUM_THINK_TIME value,
        the previous think time is used. This happens, for example, if the
        user used the type-ahead feature. If this is the first calculation of
        think time and there is no previous think time, the ~P1
        value is used.

        Ifthe think time is greater than the MINIMUM_THINK_TIME value and
        less than the ~P1 value, the think time is not changed. 

        If the think time is greater than the ~P1 value, the
        think time is set to the ~P1 value.

  The next time a job goes into long wait, the system calculates when it
  expects input from the user (estimated ready time). The estimated ready time
  is the current time plus the think time.

      estimated ready time = current time + last estimated think time

  Jobs that are in long wait are swapped out. If enough memory is available,
  the jobs remain memory resident and are queued according to when the system
  expects the next input for the job.
  Refer to the MINIMUM_AVAILABLE_PAGES memory attribute (described in SPAMM
  chapter 3, Managing Memory) for a description of when jobs are allowed
  to remain memory resident.

  If an active job needs more pages of real memory and not enough pages are
  available, one of the memory resident jobs may be freed and its pages made
  available. The job to be freed is selected as follows:

    1.  If a job's estimated ready time has elapsed and the additional time
        specified by the THINK_EXPIRATION_TIME system attribute has also
        elapsed, the job with the oldest estimated ready time is freed.

    2.  Otherwise, the job with the most distant estimated ready time is
        freed.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXIMUM_WRITE_SPAN
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum gap allowed between the end-of-information (EOI)
  address and the byte address of the file the system is attempting to write.

  Attempting to write beyond the specified gap is considered a runaway
  write operation. As a result, an mmc$sac_runaway_write Segment Access
  Condition is sent to the task what will translate into te status condition
  ame$maximum_write_span_exceeded.


  NOTE:
    Actually, this attribute works in very rare cases. Changing the
    algorythm to detect all runaway writes will break the system in task
    initialization.

  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAXWS_AIO_THRESHOLD
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies a limit used to prevent a task from flooding the system with I/O
  requests when the task's job reaches its maximum working set size. If a
  task causes a page to be read from disk when the task's job has reached
  the specified limit of active I/O requests and the job's working set is
  at the maximum size, then the task is forced to give up the CPU (task
  switch).

  This allows another task to execute. If the new task needs to initiate I/O,
  it can do so because the I/O queues are not filled by the first task. This
  system attribute is effective in controlling jobs that read large files and
  cause numerous disk reads.

  NOTE:
    The attribute actually limits the number of active I/O requests. Therefor
    it has no effect in random reads or non-streaming mode. It also has
    no effect on pages going into the share queues.

    Even when a task hits this limit the impact is mariginal, as the task is
    not suspended. The task will immediatly get rescheduled on a system with
    low CP usage.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MINIMUM_SHARED_WORKING_SET
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the minimum number of pages to which the task service shared
  queue can be reduced as a result of page aging. The system will not release
  shared pages (as a result of page aging) when the number of shared pages is
  at or below the value specified for this system attribute.
  This system attribute does not prevent task service shared queue pages
  from being released as a result of a close file request or job termination.
  The   system will age pages below the number specified by this system
  attribute if the system is performing aggressive aging (see the
  AGGRESSIVE_AGING_LEVEL and AGGRESSIVE_AGING_LEVEL_2 memory attribute
  descriptions in SPAMM chapter 3, Managing Memory).

  For most systems, use the default value of 0. Do not set this system
  attribute to a value higher than approximately half the memory available to
  user jobs after deadstart.

  See SPAMM chapter 6, Page Aging, for more information about how
  this system attribute applies to page aging.

  NOTE:
    We recommend you use the MINIMUM_SIZE attribute of each shared queue
    rather than the ~P1 system attribute. See the
    CHANGE_SHARED_QUEUE_ATTRIBUTE subcommand in SPAMM chapter 3, Managing
    Memory, for a description of the MINIMUM_SIZE attribute.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MINIMUM_THINK_TIME
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  See the MAXIMUM_THINK_TIME description for a description of the
  ~P1 system attribute.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=NETWORK_ACTIVATION
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether the system automatically attempts to activate the NEPTUN
  network during execution of the ACTIVATE_PRODUCTION_ENVIRONMENT command.

  If the value of this system attribute is 1, the system attempts to activate
  NAM/VE; if its value is 0, no attempt is made to activate NAM/VE.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=PROCESSOR_DUE_THRESHOLD
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of nonfatal detected uncorrected errors (DUEs) that
  a NEPTUN job mode task can encounter in a given CPU before the system removes
  that CPU from the set of processors on which the task can execute.

  In a multiple-CPU environment, the task executes on another CPU. In a
  single-CPU environment, the task aborts and the system attempts to execute a
  STEP_SYSTEM command.

  For additional information, see the description of the ABORTED_TASK_THRESHOLD
  system attribute.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=READ_TU_EXECUTE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  The following description applies to both the ~P1 and the
  READ_TU_READ_WRITE system attributes.

  For NEPTUN or NOS/VE Version 1.4.1 or later, the system automatically reads
  multiple pages for each page fault in a segment that is being referenced
  sequentially. Therefore, the importance of system attributes
  ~P1 and READ_TU_READ_WRITE is greatly reduced.
  The appropriate value for both of these system attributes is simply the
  number of pages to be read in for each normal (nonsequential) page
  fault.

  We recommend that these system attributes be left at their release
  values of 1. However, those sites that have increased one or both of
  these values prior to installing NEPTUN OR NOS/VE Version 1.4.1 or a later
  version may find it useful to set both system attributes to 2.

  The value of these system attributes must not exceed the number of pages that
  make up a transfer unit (16K bytes of data). In versions previous to
  NEPTUN or NOS/VE 1.4.1, values greater than that had little effect, but now
  larger values inhibit the automatic detection of sequential page faults
  and thus degrade performance.

  The NEPTUN and NOS/VE hardware divides all segments into transfer units (TU).
  A transfer unit consists of 16,384 bytes. If your page size is 4,096 bytes
  (the default), you have four pages per transfer unit. If your page size is
  8,192 bytes, you have two pages per transfer unit. (The page size is selected
  through the CYBER Initialization Package (CIP) at deadstart.)

  With these system attributes you can specify the number of pages the system
  attempts to read into memory when it needs a page. The word attempt is used
  because the system cannot read beyond a transfer unit boundary. For example,
  if you specified a value of 3 for the ~P1 system attribute and a
  read request is made for page 7 in a segment, pages 7 and 8 are read into
  memory as shown in the following figure. The system cannot read page 9 since
  it cannot cross the transfer unit boundary.
  This situation assumes a page length of 4,096 bytes.

  Increasing the value of this system attribute may reduce the number of disk
  accesses for read/execute data, but more memory is used.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=READ_TU_READ_WRITE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  The following description applies to both the READ_TU_EXECUTE and the
  ~P1 system attributes.

  For NEPTUN or NOS/VE Version 1.4.1 or later, the system automatically reads
  multiple pages for each page fault in a segment that is being referenced
  sequentially. Therefore, the importance of system attributes
  READ_TU_EXECUTE and ~P1 is greatly reduced.
  The appropriate value for both of these system attributes is simply the
  number of pages to be read in for each normal (nonsequential) page
  fault.

  We recommend that these system attributes be left at their release
  values of 1. However, those sites that have increased one or both of
  these values prior to installing NEPTUN OR NOS/VE Version 1.4.1 or a later
  version may find it useful to set both system attributes to 2.

  The value of these system attributes must not exceed the number of pages that
  make up a transfer unit (16K bytes of data). In versions previous to
  NEPTUN or NOS/VE 1.4.1, values greater than that had little effect, but now
  larger values inhibit the automatic detection of sequential page faults
  and thus degrade performance.

  The NEPTUN and NOS/VE hardware divides all segments into transfer units (TU).
  A transfer unit consists of 16,384 bytes. If your page size is 4,096 bytes
  (the default), you have four pages per transfer unit. If your page size is
  8,192 bytes, you have two pages per transfer unit. (The page size is selected
  through the CYBER Initialization Package (CIP) at deadstart.)

  With these system attributes you can specify the number of pages the system
  attempts to read into memory when it needs a page. The word attempt is used
  because the system cannot read beyond a transfer unit boundary. For example,
  if you specified a value of 3 for the READ_TU_EXECUTE system attribute and a
  read request is made for page 7 in a segment, pages 7 and 8 are read into
  memory as shown in the following figure. The system cannot read page 9 since
  it cannot cross the transfer unit boundary.
  This situation assumes a page length of 4,096 bytes.

  Increasing the value of this system attribute may reduce the number of disk
  accesses for read/execute data, but more memory is used.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=RECOVER_AT_ALL_COSTS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether to ignore certain errors during a recovery deadstart.
  During a continuation deadstart, NEPTUN may fail with any of the following
  errors:

    ERR=VEOS1100- <recorded_vsn> log starts incorrectly
    ERR=VEOS1100- <recorded_vsn> log check byte missing
    ERR=VEOS1100- <recorded_vsn> invalid log entry
    ERR=VEOS1100- Invalid DAT change.
    ERR=VEOS1100- Invalid DFL change.

  These errors indicate that the transaction log for the specified mass storage
  device has become corrupted or that errors have been encountered while trying
  to apply changes to system tables. This can occur due to a recovery without
  image. The system's inability to make these changes means that the tables may
  be inconsistent, causing user tasks to terminate.

  Specifying a value of 1 for this system attribute instructs the system, during
  a recovery deadstart, to ignore any transaction log that has become corrupted
  or that contains any change considered invalid.

  NOTE:
    As an alternative to using this system attribute, remove the device from the
    configuration and restore any lost cycles.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SECURITY_LOG_CRITICAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the action NEPTUN takes when it is unable to record an entry
  in the security log. If the value of this system attribute is 1, NEPTUN
  terminates any time the system is unable to record an entry.
  If the value of this system attribute is 0, NEPTUN discards the entry and
  informs the operator by way of a message in the critical display window.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SECURITY_LOG_MAXIMUM_SIZE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum size, in megabytes, of the security log.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SITE_ACTIVE_SHARED_QUEUES
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of active site-defined shared queues. The value ranges
  from 0 through 25. Because the number of active shared queues is not
  preserved by deadstart, a SET_SYSTEM_ATTRIBUTE command must be present in
  the DCFILE to set the number of active shared queues.

  If the number of active shared queues is not specified in the DCFILE, no
  site-defined shared queues are activated, and job recovery changes the shared
  queue of files attached by active jobs from a site-defined shared queue to
  the system-defined shared queue. During system operation, you can change
  the number of site active shared queues by using the
  ~P1 system attribute.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SPACE_MESSAGES_TO_CONSOLE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether to display the number of volumes low message and the
  number of volumes out message at the critical display window of the
  system console.

  If the value of this system attribute is 1, NEPTUN displays these messages
  regarding mass storage space.
  If the value of this system attribute is 0, NEPTUN does not display
  these messages.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=STATISTIC_LOG_CRITICAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the action NEPTUN takes when it is unable to record an entry in
  the statistic log.

  If the value of this system attribute is 1, NEPTUN terminates any time the
  system is unable to record an entry.

  If the value of this system attribute is 0, NEPTUN discards the entry and
  informs the operator by way of a message in the critical display window.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=STATISTIC_LOG_MAXIMUM_SIZE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum size, in megabytes, for the statistic log.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SWAP_FILE_ALLOCATION_SIZE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of bytes per allocation unit for swap files.
  This system attribute may have an effect on system swapping performance.
  If your site has faster swapping devices, you may want to increase this
  value. However, the value should not exceed the cylinder size of the swapping
  device.
  In addition, the value should be a power of two.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SWAP_JOBS_IN_LONG_WAIT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies a boolean value that turns long-wait job swapping on or off.

  If you specify a value of 0 (FALSE), jobs in long wait are not swapped out,
  regardless of the values entered for the LONG_WAIT_FORCE_SWAP_TIME and
  LONG_WAIT_SWAP_TIME system attributes.

  If you specify 1 (TRUE), job-swapping occurs according to the values entered
  for the LONG_WAIT_FORCE_SWAP_TIME and LONG_WAIT_SWAP_TIME system attributes.

  We recommend that you leave this system attribute set to TRUE. You can
  control swapping to disk to some extent by using the
  MAX_TIME_SWAP_IO_NOT_INIT and MAXIMUM_SWAP_RESIDENT_TIME system attributes.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SYSTEM_ACTIVATION
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether system activation is automatically performed (through
  execution of the ACTIVATE_PRODUCTION_ENVIRONMENT command) during system
  initiation.
  System activation refers to making the system available to users at the
  end of the deadstart process. The ACTIVATE_PRODUCTION_ENVIRONMENT
  command is described in the NEPTUN Operations manual.

  If the ~P1 system attribute is set to 0 (FALSE), the system
  prompts you to determine whether the system should be activated or
  whether installation work (file reloading, file upgrading, and
  installing deferred files) should first be performed.

  If this system attribute is set to 1 (TRUE), the system is activated
  without manual intervention.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SYSTEM_DEBUG_RING
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies a P register ring number. This system attribute is used primarily
  for debugging software problems.

  Any error that occurs in any task with a ring number less than or equal to
  the ring number you specify causes the NEPTUN monitor to interrupt the task
  and call the system core debugger.
  You can then use the system core debugger to examine the task environment
  as outlined in the NEPTUN System Performance and Maintenance manual,
  Volume 2.

  If you enter the system core debugger subcommand RUN, the NEPTUN monitor
  takes its normal action for the specific fault.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SYSTEM_DEBUG_SEGMENT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Allows use of the system core debugger to be limited to NEPTUN operating
  system segments only. If an error occurs that meets the criteria for the
  SYSTEM_DEBUG_RING system attribute, the P register segment number is
  compared to the current value of the ~P1 system attribute
  to determine whether the system core debugger should be called.

  The debugger is called if either of the following is true:

  * The value of the ~P1 system attribute is 0. 

  * The P register segment number is less than or equal to the value of the
    ~P1 system attribute.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SYSTEM_ERROR_HANG_COUNT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of broken task errors allowed in any given task before
  that task is considered a hung task.
  For more information on broken tasks, refer to SPAM appendix D, NEPTUN
  Processing of Job Mode Software Errors.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SYSTEM_LOG_CRITICAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the action NEPTUN takes when it is unable to record an entry
  in the system log.

  If the value of this system attribute is 1, NEPTUN terminates any time the
  system is unable to record an entry.

  If the value of this system attribute is 0, NEPTUN discards the entry and
  informs the operator by way of a message in the critical display window.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SYSTEM_LOG_MAXIMUM_SIZE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum size, in megabytes, for the system log.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=TELNET_CONNECTION_LIMIT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum amount of time, in milliseconds, a user will wait for
  the telnet connection to complete.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=TEMP_FILE_SPACE_GUARD
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether temporary file space allocated by the system on
  behalf of a user is limited by the user's TEMPORARY_FILE_SPACE_LIMIT
  validation.

  If the value for this attribute is 1, all temporary file space allocated
  is counted against the user's validation limit.

  If the value is 0, only space allocated directly by the user is counted.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=THINK_EXPIRATION_TIME
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  For a description of this system attribute, refer to the MAXIMUM_THINK_TIME
  system attribute.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=UNLOAD_DEADSTART_TAPE
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether to rewind and unload the deadstart tape or just rewind
  it at the completion of a tape deadstart.

  If the value of this system attribute is 1, the deadstart tape is rewound
  and unloaded.

  If the value of this system attribute is 0, the deadstart tape is rewound
  only.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=VALIDATE_ACTIVE_SETS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether file and catalog management validation processes are
  performed during a continuation deadstart.

  If the value of this system attribute is 1, the validation processes are
  performed.

  If the value is 0, the processes are not performed.


  NEPTUN has a concept of delayed purge. That is, if user A has user B's file
  attached when user B deletes it, the purge of the file is delayed until user
  A detaches it. User B's deletion does not affect user A's job.
  This works well if user A's job reaches termination. Detaching the purged
  file deletes the catalog entry and the mass storage space.
  If the job does not detach the file, no one else can attach or delete it
  and the mass storage space remains defined.

  A broken job or turning off job recovery are two common ways to get into
  this situation in a normal job.

  If the system fails and job recovery is deselected or some jobs do not
  recover, the purge of some files may be delayed. In this case, you should
  set ~P1 to 1.

  The system console is a special case because the system job never terminates
  and is never recovered. Therefore, any file attached to the system job and
  deleted in the system job or by another job becomes a delayed purge file.

  ~P1 causes the following file and catalog management
  validation processes to occur for all mass storage sets that are active
  during a continuation deadstart: 

  * Breaking file attachments. This process resets the interlocks that were
    set by jobs hi the system prior to an interruption. The interlocks are
    maintained in the parent catalog of each file.

    If the value of the ~P1 system attribute is 0,
    file attachments are broken when the file is first attached after a
    continuation deadstart, rather than during deadstart.

 *  Catalog validation. This process validatescatalog integrity by
    recalculating and comparing checksums on individual objects in each
    catalog. The system discards any catalog object that does not validate,
    provided the system attribute DELETE_UNRECONCILED_FILES is set to 1.

    If the value of the ~P1 system attribute is 0, catalog
    validation is not performed.

 *  Catalog reorganization. This process rebuilds the datastructure associated
    with each catalog to conserve mass storage space. This process also
    automatically moves catalogs if mass storage class membership has changed
    or if a rebuilt catalog cannot be rewritten without error.

    If the value of the ~P1 system attribute is 0, catalog
    reorganization and catalog movement are not performed.

 *  Recovery of overflowed files. When a permanent file overflows from one
    mass storage volume to another, the catalog is updated to identify the
    additional volume(s) when the file is detached.
    A system interruption prevents the overflow update operation.

    If the value of the ~P1 system attribute is 0, recovery
    of overflowed files occurs when the file is first attached during or after
    a continuation deadstart.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=VECTOR_SIMULATION
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies how NEPTUN should process tasks that attempt a vector operation
  when either the processor does not support vector operations, or vector
  operations are degraded in the processor.

  Simulating a vector operation significantly increases both task execution
  time and the number of accumulated SRUs. For this reason, we recommend that
  you simulate vector operations only when testing applications.

  This system attribute can be set to one of the following values:

  0: Tasks that attempt a vector operation continue executing. The vector
     operation is simulated by software. This is the default.

  1: Tasks that attempt a degraded vector operation are suspended for
     approximately 5 minutes. After 5 minutes, the task reattempts the vector
     operation.

     NOTE:
       A task under control of the debugger is not suspended. Instead, these
       tasks are aborted with an unimplemented instruction condition, and
       control is returned to the debugger. The debugger can then determine
       the cause of the unimplemented instruction.

  2: Tasks that attempt a vector operation are terminated with a message
     indicating that vector simulation is disabled.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AGGRESSIVE_AGING_LEVEL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies a value at which the system forces the aging of the shared
  queues and the job working sets.
  When the number of reassignable (free and available) pages falls below this
  value, the system ages and removes pages from the shared queues and job
  working sets even though the times specified by the
  SHARED_WORKING_SET_AGE_INTERVAL and JOB_WORKING_SET_AGE_INTERVAL memory
  attributes have not elapsed.

  See also the AGGRESSIVE_AGING_LEVEL_2 System Attribute.

  NOTE:
    This attribute is now maintained by the MANAGE_MEMORY_ATTRIBUTE utility.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AGGRESSIVE_AGING_LEVEL_2
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Signals the scheduler that not enough reassignable (free and available) pages
  reside in real memory. When the scheduler receives this signal, it starts
  swapping out jobs until the number of reassignable pages reaches a target
  value. This value is specified by the target memory value in the
  SCHEDULING_MEMORY_LEVELS scheduling attribute described in SPAMM chapter 4,
  Job Scheduling.

  If the value of the ~P1 memory attribute is set too high, memory is wasted
  because the scheduler swaps out jobs that could remain in memory if this
  memory attribute were set properly.
  If the value of this memory attribute is set too low, the number of
  reassignable pages may too often fall to the level set by the
  AGGRESSIVE_AGING_LEVEL memory attribute.

  The value specified by this memory attribute also determines the point at
  which page assignments are restricted to system tasks. When the number of
  reassignable pages falls below the minimum value, only system tasks are
  assigned additional pages and no pages are assigned to user tasks. At the
  same time, the scheduler is swapping user jobs out of memory so that more
  reassignable pages are made available.
  Once there is a sufficient number of reassignable pages, user jobs are again
  assigned pages.

  To check the page fault statistics, enter the following command:

    /display_system_data pf

  or use the OS1 periodic statistic.

  Check the LOW_ON_MEMORY and the NO_MEMORY values for the page fault
  statistics. LOW_ON_MEMORY is a count of the number of times page faults are
  rejected for user jobs.
  NO_MEMORY is a count of the number of times page faults are rejected for
  system-critical tasks.
  If either of these counts is too high, increase the value of this memory
  attribute.

  NOTE:
    The value of this memory attribute should be greater than the value
    specified by the AGGRESSIVE_AGING_LEVEL memory attribute. The values
    for the ~P1 memory attribute and for the thrashing
    level entry in the SCHEDULING_MEMORY_LEVELS scheduling attribute should be
    equivalent or within a few pages of each other.

    This attribute is now maintained by the MANAGE_MEMORY_ATTRIBUTE utility.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AGING_ALGORITHM
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies an integer value indicating how the job's accumulated CPU time is
  computed for comparison with the page aging interval. This computation helps
  determine how the pages in a job are aged. You can specify one of the
  following entries: 

  * A value greater than or equal to 4. In this case, CPU time is based on
    job mode CPU time. Although you can  specify a value between 4 and 100,
    the effect is the same.

  *  A value less than 4.In this case, CPU time is based on the sum of job
    mode and monitor mode CPU time. Any value less than 4 has the same effect.

  Values greater than or equal to 4 are useful when the system has jobs with
  very large working sets. In these cases, specifying a value less than 4 can
  cause the working set to be aged too often. This is because the process of
  aging a large working set accumulates monitor mode CPU time.

  See SPAMM chapter 6, Page Aging, for more information about how this
  attribute applies to page aging.

  NOTE:
    This attribute is now maintained by the MANAGE_MEMORY_ATTRIBUTE utility.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=AVAILABLE_MODIFIED_QUEUE_MAX
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum number of pages for the Available Modified page queue.
  The Available Modified queue contains modified pages that must be written to
  disk before they are available to satisfy page faults. If an application
  modifies pages very rapidly, the Available Modified queue grows faster than
  pages can be written to disk until all pages in the Free and Available queues
  are consumed.
  When this occurs, system performance degrades severely.

  Setting the ~P1 memory attribute to an appropriate
  value significantly reduces the degradation.

  NOTE:
    The original implementation of this attribute was the reason for several
    system crashes.
    The current implementation delays jobs until the size of the queue goes
    below the limit. But the implementation is incomplete. There are several
    situations where the process that writes the pages is the system job which
    cannot be delayed and there is currently no way to identify the job
    producing the data.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=JOB_WORKING_SET_AGE_INTERVAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Governs the aging of the working set when a page fault occurs infrequently
  for a job. When the job generates page faults often enough (that is, when a
  page fault occurs before the time specified by the
  ~P1 memory attribute elapses), the
  PAGE_AGING_INTERVAL scheduling attribute controls the process.

  For more information about the aging of job working sets, refer to the
  description of the PAGE_AGING_INTERVAL scheduling attribute in SPAMM
  chapter 4, Job Scheduling.

  If a job is CPU-bound and is no longer page faulting, the job's working set
  is aged when the time specified by the ~P1 memory
  attribute elapses.

  Increasing the value of this memory attribute can increase the probability
  that a page from a job's working set remains in memory, but it also increases
  the size of a job's working set, which increases the swap time of a job and
  decreases the number of jobs that can reside in memory.

  See SPAMM chapter 6, Page Aging, for more information about how this memory
  attribute applies to page aging.

  NOTE:
    The value of the ~P1 memory attribute should be
    greater than the value of the PERIODIC_CALL_INTERVAL memory attribute.

  NOTE:
    This attribute is now maintained by the MANAGE_MEMORY_ATTRIBUTE utility.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MINIMUM_AVAILABLE_PAGES
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the minimum number of reassignable (free and available) pages that
  must be in real memory in order for swapped jobs to remain memory resident.

  When a job is swapped out and the number of free and available pages is
  greater than the value specified by the ~P1 memory
  attribute, the job is put in the long wait queue and not written to disk.
  If the number of free and available pages is below the value specified by the
  ~P1 memory attribute, the swapped job is written to
  disk and put in the swap resident queue. The pages of a swap resident job
  are freed when they are needed.

  The MAX_TIME_SWAP_IO_NOT_INIT system attribute and the
  MAXIMUM_SWAP_RESIDENT_TIME system attribute determine how long a job is
  allowed to remain memory resident. These system attributes are described in
  SPAMM chapter 2, Adjusting System Attributes.

  If you have a large memory system (that is, greater than 256 megabytes), you
  may have to adjust the value of this attribute for optimum performance.
  Refer to the chapter called Handling Bottlenecks in the System for more
  information on tuning large memory systems.

  When a page of real memory is needed to satisfy a page fault or swap-in
  request, the page that is used is selected by the following rules:

  1. Take pages from the free queue until it is empty.
  2. Take pages from the available queue until the next request would make the
     number of pages less than that specified by the ~P1
     memory attribute.
  3. Free the memory of a swap resident job and use those pages.
  4. Take pages from the available queue, even though it already has fewer
     pages than the amount specified by the ~P1 memory
     attribute.

  Setting the ~P1 memory attribute to a small number allows
  jobs to remain memory resident. However, this has the effect of reducing the
  size of the available queue which may lead to more page faults from disk.

  NOTE:
    This attribute is now maintained by the MANAGE_MEMORY_ATTRIBUTE utility.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SHARED_WORKING_SET_AGE_INTERVAL
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the rate, in microseconds, at which the system ages shared queues.
  When a queue is aged, a page is removed if its age exceeds the value specified
  by the AGE_INTERVAL_CEILING memory attribute.

  Expiration of the time specified by the ~P1 memory
  attribute is checked within the NEPTUN memory manager.
  The memory manager is called at intervals established by the
  PERIODIC_CALL_INTERVAL memory attribute.

  The value of the ~P1 memory attribute should be
  greater than the value of the PERIODIC_CALL_INTERVAL memory attribute.

  NOTE:
    This attribute is now maintained by the MANAGE_MEMORY_ATTRIBUTE utility.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SWAPPING_AIC_MODIFIED
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of times an unused but modified page in a job's working
  set can be swapped out of memory before it is removed from the working set.
  (AIC stands for aging interval ceiling.)

  This memory attribute may have a significant effect on system performance.
  Increasing this value may increase the chances that a page will be in memory
  but may also increase the swap file size. An increase in swap file size but,
  in turn, increase swap time.

  See SPAMM chapter 6, Page Aging, for more information about how this memory
  attribute applies to page aging.

  Also see description for the SWAPPING_AIC_UNMODIFIED memory or system
  attribute.

  NOTE:
    This attribute is now maintained by the MANAGE_MEMORY_ATTRIBUTE utility.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=SWAPPING_AIC_UNMODIFIED
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of times an unused and not modified page in a job's
  working set can be swapped out of memory before it is removed from the
  working set. (AIC stands for aging interval ceiling.)

  This memory attribute may have a significant effect on system performance.
  Increasing this value may increase the chances that a page will be in memory
  but may also increase the swap file size. An increase in swap file size but,
  in turn, increase swap time.

  See SPAMM chapter 6, Page Aging, for more information about how this memory
  attribute applies to page aging.

  Also see description for the SWAPPING_AIC_MODIFIED memory or system
  attribute.

  NOTE:
    This attribute is now maintained by the MANAGE_MEMORY_ATTRIBUTE utility.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ASSIGN_MULTIPLE_PAGES
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of pages that must be reassignable (available + free)
  to assign multiple pages on a new page fault (extending a segment).

  When there are more than ~P1 reassignable pages, the system
  will try to allocate/reserve up to 16 KBytes but a maximum of 4 pages
  in the same allocation unit.

  When there are less or equal than ~P1 reassignable pages,
  the system will only allocate/reserve a single page.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ASSIGN_VOLUME_RETRY_WAIT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of milliseconds the task is delayed after a failed
  attempt in trying to allocate the requested file space during a file or
  catalog creation operation until the request gets reissued.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=BINARY_CATALOG_SEARCH
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether a binary or a linear search is performed in locating an
  object in a catalog.

  0: A linear search is performed. This value should only be used when the
     catalog was not previously sorted.
     We do not recommend to use this option!

  1: A binary search is performed. This value should always be used on systems
     sorted catalog objects.

  NOTE:
    Catalogs are sorted in all systems later than NOS/VE 1.4.1.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CATALOG_ACCESS_RETRY_WAIT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of milliseconds the task is delayed until it
  reissues the request in a locked catalog situation.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CATALOG_NAME_SECURITY
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether catalog names are visible to other users or
  not.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CHANGE_SECURE_LOGGING
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  This attribute currently has no effect.
  This attribute was designed to specify whether secure parameters are logged
  in the job log or not.

  The implementation of this attribute got removed or was not completed. The
  system command CHANGE_SECURE_LOGGING still exists and changes the variable
  but the command logging process ignores it.

  This attribute cannot be set via the SET_SYSTEM_ATTRIBUTE command. It must be
  set via the CHANGE_SECURE_LOGGING command during system operation.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CLIENT_JOB_LISTS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  This attribute specifies the maximum number of concurrent client jobs per
  served mainframe in a File Server environment.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CLONE_ENABLED
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether the actual NEPTUN Job Template is cloned into an Alternate
  Job Template or not when alternate job templates are active.

  NOTE:
    This attribute is only for OS debugging purpose and should not be used
    during normal operations.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CMV$DEBUG
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies Configuration Manager Debug Options.
  This attribute can be set to one of the following values:

   0: Configuration Manager Debugging disabled.

   1: System stops at the beginning of CMP$FIND_REDUNDANT_PATH.

   2: System stops in CMP$FIND_REDUNDANT_PATH after scanning the units.

   3: System stops in CMP$SELECT_PRIMARY_CONTROLLER after trying to locate
      the primary controller.

   4: System stops in CMP$SELECT_PRIMARY_CONTROLLER after trying to
      locate the redundant path and also at the end of SELECT_7155_CONTROLLER.

   5: System stops at the beginning of CMP$VERIFY_ACTIVE_PATH_EXISTS.

   6: System stops at the end of CMP$VERIFY_ACTIVE_PATH_EXISTS.

   7: System stops in CMP$LOCATE_ELEMENT_VIA_ADR when the element is not found
      in the peripheral element table.

   8: System stops in CMP$CHANGE_CONNECTION_STATUS for a mass storage address
      after it located the element.

   9: System stops in CMP$CHANGE_CONNECTION_STATUS for a mass storage address
      after it tried to locate the unit in the downline controller connection.

  16: System stops at the beginning of CHANGE_STATE.

  17: System stops in CHANGE_STATE after redundant_path processing.

  18: System stops in CHANGE_STATE after processing all the units.

  19: System stops at the beginning of CHANGE_UNIT_DESCRIPTORS.

  20: System stops in the loop trying to find the PP for a unit in
      CHANGE_UNIT_DESCRIPTORS.

  21: System stops in the second PP/Unit loop where it does a reenable_unit
      try in CHANGE_UNIT_DESCRIPTORS.

  22: System stops in CMP$SWITCH_TO_REDUNDANT_PATH after trying to find the
      redundant path.

  NOTE:
    This attribute is only for OS debugging purpose and should not be used
    during normal operations, as the system will most likely stop sooner or
    later. And with stop I mean really stop.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CONNECTION_MGMT_EXPIRATION_INT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the time in microseconds until a connection timeouts and gets
  deleted in monitor server connections when the connection is not taken over
  by a server.

  So far I have not seen this situation during normal production but rather in
  the NAM/VE hang situation.


  NOTE:
    This attribute is only for OS debugging purpose and should not be used
    during normal operations.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=CYCLE_WAIT_TIME
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the time in microseconds until the task is rescheduled when it
  processed a PMP$CYCLE, TMP$CYCLE or a forced task task switch.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEADSTART_INTERVENTION
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether the system intervenes during deadstart for
  operator action after the Job Template Initialization Phase 2.

  A utility is called that allows the operator to enter commands or
  GO to complete the deadstart.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEBUG_AV
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  ~P1 is designed for Accounting & Validation debugging.
  There is currently no debug code in this area and the attribute
  is ignored.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=OSV$DEBUG
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  The attributes DEBUG0 .. DEBUG15 are designed for OS debugging purpose and
  should not be used during normal operations. It's most likely that the system
  will stop sooner or later or other bad things may happen, such as I/O errors.
  With stop I mean really stop!

  These attributes sometimes work together meaning more than one of the
  attributes are taken in account for a special situation or trap.

  I try to keep this documentation up to date, when related code get added,
  removed or changed.

  Ok, let's see what we have in the bags:

  * Device Log Recovery during a Deadstart:
      DEBUG1 <> 0: System stops immediatly when an error occures in
         recovering a mass storage device log.

  * DAT I/O error in creating dat:
      DEBUG3 <> 0: DAU is output in dmp$analyze_dat_position condition handler
                   Position is output in create_mat
      DEBUG3 > 10: System halts in dmp$analyze_dat_position condition handler

  * Pico Tests:
      Kill, when DEBUG4 * (operation_status_register, ipi_dma_register,
         ipi_channel_error_register, ipi_channel_status_register) <> 0

  * Device File left attached in move_classes (currently *if false'ed out)
      DEBUG13 = 1: A Read Beyond EOI condition is raised after allocating and
         moving the data.
      DEBUG13 = 2: An IO Read Error condition is raised after allocating and
         moving the data.
      DEBUG13 = 3: A Read Beyond EOI condition is raised after accessing the
         catalog object.
      DEBUG13 = 4: An IO Read Error condition is raised after accessing the
         catalog object.
      DEBUG14 <> 0: An IO Read Error condition is raised in moving the cycle
         data at byte address >= DEBUG15.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEBUGGER_PAGE_WAIT_LINES
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the number of lines displayed on th econsole during a SYSDEBUG
  session display command.

  When ~P1 is 0, the system will calculate the number of displayable lines
  based on the window size of the debugger session.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEBUG_CATALOG_ACCESS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the whether or not catalog debugging messages will be emitted to
  system and job log.

  The system will emit debugging messages in situations such as:

    * catalog alarms

    * catalog locked by other tasks

    * catalog access retry waits

  So for an example, this attribute can be used to tune the
  CATALOG_ACCESS_RETRY_WAIT system attribute.

  NOTE:
    Activating this attribute can severly degrade system performance!


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEBUG_JOB_RECOVERY
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  This attribute is for debugging job recovery during a deadstart.

  When this attribute is set to 1, the system will:

  * When ~P1 and also FILE_SERVER_DEBUG_ENABLED are
    both set to 1 then the system will stop in File Server recovery on
    an error in relinking a served file.

  * The System Core Debugger gets invoked on a recovered segment conflict
    situation.

  * The System Core Debugger gets invoked on a recovery failure with a normal
    status or a condition other than ose$path_table_locked.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEFAULT_PIT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the default value for the PIT (Process Interval Timer).
  The value is used in task creation to set up the initial PIT value
  in the XCB of the new task.

  The system core trap handler also restores this value in the XCB when
  a PIT Trap occured.

  The value is in microseconds.

  (The PIT is maintained in the XCB of each task while the PIT of the
  active task in the CPU register gets decrementing every microsecond.
  A PIT interrupt occures when the counter goes to 0.)

  NOTE:
    This attribute should not be changed without good reasons, as it could
    severly degrade system performance.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEFAULT_SIT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the value for the SIT (System Interval Timer).
  The value is in microseconds.

  A SIT interrupt occures, when the SIT CPU register goes to 0.
  The SIT is used as the Timesharing interrupt and therefore is the
  actual timeslice.
  On a task switch, the monitor interrupt handler stores the task timeslice
  in the CP SIT register.

  Default SIT is used, in situations where the task timeslace cannot be used,
  such as: Idle Loop, Task Switch, Severe Thrashing, External Interrupt
  Processing.

  NOTE:
    This attribute should not be changed without a good reason, as it could
    severly degrade system performance, or the system could be stopped by DFT
    on a negative SIT count when the keep alive flag is not properly updated!


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DEVELOPMENT_DEADSTART
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the value for the boolean Development Deadstart variable.
  This variable is copied to the SCL variable RAV$DEVELOPMENT_DEADSTART
  before the activation prologs and epilogs are processed.

  The SCL variable RAV$DEVELOPMENT_DEADSTART can be made available inside
  the prologs and epilogs via an SCL XREF variable declaration. What allows
  to influence the system activation based on the system attribute.

  There is no reference to the SCL nor the attribute variable on a released
  system. But it could be used to ex. not start the system_periodic_job.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DISABLE_NETWORK_RELAYS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  There is currently no code associated to this attribute.
  The attribute is ignored.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=DISABLE_WRITE_FOR_PERF_MEAS
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies whether or not an IO write operation effectivly writes out the page
  to disk or not.

  When this attribute is set to 1, then the Memory Manager will do all the
  setup for writing the page but it will not hand it over to the INPUT OUTPUT
  Manager. As a result, the page is NOT WRITTEN to disk and is LOST.

  NOTE:
    This sould not be used without good reasons, as the system becomes
    more or less inoperatable and can cause sever damage when it's set
    during normal operations.

    This attribute was intended for performance measurments of the
    Memory Manager.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=MAT_CHANGE_COUNT_MAX
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Specifies the maximum number of MAT changes that will be performed by one
  monitor interrput.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
~"CREATE_PARAMETER_HELP_MESSAGE NAME=ENABLE_TASK_CLEANUP_COUNT
               ~P1 NEPTUN System Attribute Help

  System Attribute ~P1:

  Selects the method used for CM task cleanup.

  When ~P1 is set to 1, CM task cleanup only takes
  place, when the task reserved element count is non zero.

  When ~P1 is set to 0, CM task cleanup alyways takes
  place. The Peripheral Element Table, the Concurrent Access List and the
  Logical PP Table is scanned for elements reserved by the current task and
  the reserved elements are released.


  System Attribute Settings:

  Attribute Name             : ~P1
  Current Value              : ~P2
  Value Range                : ~P3
  Changable after Deadstart  : ~P4
  Attribute Type             : ~P5
  Saved Values
    OS Default Value         : ~P6
    DCFILE Value             : ~P7
    Deadstart Complete Value : ~P8
    Site Alternate Value     : ~P9
  Group Membership           : ~R~P~N31~RE
~"**
END_MESSAGE_MODULE CREATE_MODULE=YES
