Marty.stu at 09:35, 17 February 2022

2022-02-17T09:35:58Z

← Older revision		Revision as of 09:35, 17 February 2022
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	=See also=		=See also=
	* [https://vmssoftware.com/docs/OpenVMS_Performance_Management_manual.pdf]		* [https://vmssoftware.com/docs/OpenVMS_Performance_Management_manual.pdf OpenVMS Performance Management Manual]

Marty.stu: Fixed the link to the Performance Management manual.

2022-02-17T09:34:03Z

Fixed the link to the Performance Management manual.

← Older revision		Revision as of 09:34, 17 February 2022
Line 76:		Line 76:

	=See also=		=See also=
	* [https://~~www.~~vmssoftware.com/~~pdfs/HP_branded_docs_1st_batch~~/OpenVMS_Performance_Management_manual.pdf ~~OpenVMS Performance Management Manual~~]		* [https://vmssoftware.com/docs/OpenVMS_Performance_Management_manual.pdf]

Jane.doe at 17:32, 2 December 2019

2019-12-02T17:32:04Z

← Older revision		Revision as of 17:32, 2 December 2019
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	* [[COLPG]] (collided page wait): the process has referenced a shared memory page for which another process was already in PFW state.		* [[COLPG]] (collided page wait): the process has referenced a shared memory page for which another process was already in PFW state.
	* states ending in -O (outswapped; HIBO, LEFO, etc.): the process has been [[Swapping\|swapped out]] of memory		* states ending in -O (outswapped; HIBO, LEFO, etc.): the process has been [[Swapping\|swapped out]] of memory
	The process state can be seen in the output of the [[SHOW SYSTEM]] command or obtained with the [[F$GETJPI()]] lexical function or the relevant system service.		The process state can be seen in the output of the [[SHOW SYSTEM]] command or obtained with the [[F$GETJPI]] lexical function or the relevant system service.

	=See also=		=See also=
	* [https://www.vmssoftware.com/pdfs/HP_branded_docs_1st_batch/OpenVMS_Performance_Management_manual.pdf OpenVMS Performance Management Manual]		* [https://www.vmssoftware.com/pdfs/HP_branded_docs_1st_batch/OpenVMS_Performance_Management_manual.pdf OpenVMS Performance Management Manual]

Jane.doe: Created page with "A '''process''' is a context in which images run in OpenVMS. For example, when a user logs into an OpenVMS system, an interactive process is..."

2019-11-28T13:34:43Z

Created page with "A '''process''' is a context in which images run in OpenVMS. For example, when a user logs into an OpenVMS system, an interactive process is..."

New page

A '''process''' is a context in which [[Image|images]] run in OpenVMS. For example, when a user logs into an OpenVMS system, an [[Interactive Process|interactive]] process is created for this user. If that user runs a [[Batch Job|batch job]], a [[Batch Process|batch]] process is created. If that user spawns a [[Subprocess|subprocess]], a subprocess is created. Services like [[SWAPPER]], [[Cluster|CLUSTER_SERVER]], [[Volume Shadowing|SHADOW_SERVER]], [[JOB_CONTROL]] and others that perform system tasks also run as processes. Processes are characterized by their names and [[PID|process identification codes]]; they are assigned a certain [[Base Priority|priority]], run in a certain [[Process Mode|mode]] and are in a certain [[Process State|state]] at any given moment in time. Processes running on the system at the moment can be viewed with [[SHOW SYSTEM]]:
<nowiki>
OpenVMS V8.4-2L1 on node STUDNT 18-NOV-2019 08:56:17.03 Uptime 16 08:06:40
Pid Process Name State Pri I/O CPU Page flts Pages
28E00401 SWAPPER HIB 16 0 0 00:00:01.03 0 4
28E00407 CLUSTER_SERVER HIB 12 34 0 00:00:00.07 159 194
28E00408 SHADOW_SERVER HIB 6 14930051 0 00:02:34.96 150 189
28E00409 CONFIGURE HIB 10 15 0 00:00:00.01 118 123
28E0040A USB$UCM_SERVER HIB 6 497 0 00:00:00.08 303 444
28E0040B LANACP HIB 14 105 0 00:00:00.01 201 253
28E0040D FASTPATH_SERVER HIB 10 8 0 00:00:00.01 140 167
28E0040E IPCACP HIB 10 8 0 00:00:00.00 110 139
28E0040F ERRFMT HIB 8 83189 0 00:00:00.90 194 234
28E00410 CACHE_SERVER HIB 16 70 0 00:00:00.00 99 123
28E00411 OPCOM HIB 8 806 0 00:00:00.07 971 133
28E00412 AUDIT_SERVER HIB 8 116 0 00:00:00.01 201 247
28E00413 JOB_CONTROL HIB 10 243 0 00:00:00.01 149 210
28E00419 SECURITY_SERVER HIB 10 49 0 00:00:00.03 457 585
28E0041A ACME_SERVER HIB 10 134 0 00:00:00.02 433 551 M
28E0041C SMISERVER HIB 9 109 0 00:00:00.01 303 343
28E0041D QUEUE_MANAGER HIB 10 255 0 00:00:00.11 249 321
28E00422 SMHANDLER HIB 8 52 0 00:00:00.01 272 277
28E00429 TCPIP$INETACP HIB 9 510 0 00:00:00.05 489 466
28E0042A TCPIP$BOOTP_1 LEF 10 1555 0 00:00:00.12 587 484 N
28E0042B TCPIP$FAILSAF_1 HIB 9 3716274 0 00:00:00.03 603 503 N
28E0042C TCPIP$FTP_1 LEF 10 233 0 00:00:00.04 923 611 N
28E0044C JDOE CUR 1 7 3380 0 00:00:00.46 10302 293
</nowiki>

=Process Mode=
A process in OpenVMS can run in one of the following modes:
* [[Interactive Process|Interactive]] is a process that receives commands interactively from a terminal. It is created by [[JOB_CONTROL]] when a user logs in to the system and terminated whenever the user logs out.
* [[Batch Process|Batch]] is a process that receives commands from a [[Command Procedure|command procedure]]. It is created by [[JOB_CONTROL]] based on a [[Batch Job|batch job]] that a user has submitted whenever the user determines it should be run and a [[Batch Queue|batch queue]] is available to run it. It terminates when it reaches the end of the command procedure file.
* [[Subprocess]] is a process created by an interactive or batch process using the [[SPAWN]] or [[PIPE]] command. It shares resources with the parent process and terminates when the user logs out of that process or the command submitted to [[PIPE]] is done.
* [[Network Process|Network]] is a process created by network services such as [[FTP]].
* [[Detached Process|Detached]] is a process running an [[Image|image]] and created by the [[RUN]] command. It is terminated whenever the image exits.

=Process Priority=
Process priority is a number from 0 to 31 assigned to each process that the system uses to determine which process should run next.
[[Interactive Process|Interactive]] processes receive their [[Base Priority|base priority]] from the [[SYSUAF]] record - it is either copied from the default account (4) or assigned with the /PRIORITY qualifier when the account it created in the [[AUTHORIZE]] utility. Their priority can be changed with the [[$SETPRI]] system service or the [[SET PROCESS]]/PRIVILEGE command ([[ALTPRI]] required to increase the priority of your own process, [[GROUP]] or [[WORLD]] to affect the priorities of other processes).
[[Subprocess|Subprocesses]] and [[Detached Process|detached processes]] receive their [[Base Priority|base priority]] from the [[$CREPRC]] system service or the [[RUN]] command. If none is specified, the priority of the creator is used.
[[Batch Process|Batch processes]] receive their priority from the following, in order of preference:
* the [[SET ENTRY]] command
* the [[SUBMIT]] command
* the default [[Batch Queue|queue]] priority set with [[INITIALIZE/QUEUE]]
For either command, increases are permitted only for holders of the [[OPER]] privilege.

=Process State=
Main article: [[Process State]]
A process can be in one of a few [[Process State|states]] depending on whether it is running and if not, why not:
* [[COM]] (computable): the process is ready to run
* [[CUR]] (current): the process is running
* [[HIB]] (hibernating): the process is waiting for a specific time or request from another process; this is what most of the processes like [[JOB_CONTOL]] are doing most of the time
* [[SUSP]] (suspended): the process has been suspended with the [[SET PROCESS]]/SUSPEND command; it can only be explicitly resumed by another process
* [[LEF]] (waiting for Local Event Flag): the process is waiting for some event to occur before it can proceed (usually the completion of an I/O operation or keyboard input, etc)
* [[CEF]] (waiting for Common Event Flag): like LEF, but there are a few processes waiting for the same event to occur
* [[PFW]] (page fault wait): the process has made a reference to some part of its address space that is not currently in physical memory, causing a pade fault, and is waiting for the memory management code to get that page
* RWxxx (resource wait):
** [[RWBRK]]
** [[RWCAP]]
** [[RWCLU]]
** [[RWCSV]]
** [[RWIMG]]
** [[RWMBX]]
** [[RWMPB]]
** [[RWMPE]]
** [[RWNPG]]
** [[RWPFF]]
** [[RWQUO]]
** [[RWSCS]]
** [[RWSWP]]
* MWAIT (miscellaneous wait)
* [[COLPG]] (collided page wait): the process has referenced a shared memory page for which another process was already in PFW state.
* states ending in -O (outswapped; HIBO, LEFO, etc.): the process has been [[Swapping|swapped out]] of memory
The process state can be seen in the output of the [[SHOW SYSTEM]] command or obtained with the [[F$GETJPI()]] lexical function or the relevant system service.

=See also=
* [https://www.vmssoftware.com/pdfs/HP_branded_docs_1st_batch/OpenVMS_Performance_Management_manual.pdf OpenVMS Performance Management Manual]

Process - Revision history

Marty.stu at 09:35, 17 February 2022

Marty.stu: Fixed the link to the Performance Management manual.

Jane.doe at 17:32, 2 December 2019

Jane.doe: Created page with "A '''process''' is a context in which images run in OpenVMS. For example, when a user logs into an OpenVMS system, an interactive process is..."