Working Set - Revision history

Darya.zelenina at 05:59, 3 July 2019

2019-07-03T05:59:24Z

← Older revision		Revision as of 05:59, 3 July 2019
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	A '''working set''' is a set of memory pages that a process is allowed to use.		A '''working set''' is a set of memory pages that a process is allowed to use. It resides in the [[Primary Page Cache\|primary page cache]].

	=Working Set Limits=		=Working Set Limits=

Darya.zelenina at 05:56, 3 July 2019

2019-07-03T05:56:51Z

← Older revision		Revision as of 05:56, 3 July 2019
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	* WSQUOTA (working set quota) is the number of pages guaranteed to an active process		* WSQUOTA (working set quota) is the number of pages guaranteed to an active process

	However, they may not be set lower than the following system parameters:		When an interactive job runs, the values in effect might have been lowered or raised either by the corresponding qualifiers on the last SET WORKING_SET command to affect them, or by the system service $ADJWSL. However, they may not be set lower than the following system parameters:
	* for interactive processes:		* [[PQL_MSDEFAULT]]
	** [[PQL_MSDEFAULT]]		* [[PQL_MWSQUOTA]]
	** [[PQL_MWSQUOTA]]		* [[PQL_MWSEXTENT]]
	** [[PQL_MWSEXTENT]]
	* for detached processes:		Subprocesses and detached processes derive their working set characteristics from one of the following:
	** [[PQL_SWSDEFAULT]]
	** [[~~PQL_DWSQUOTA~~]]		* $CREPRC system service
	** [[~~PQL_DWSEXTENT~~]]		* CL command RUN

			If characteristics are not specified by either of the above, then the values of the corresponding process quota and creation limit (PQL) system parameters are used:
			* [[PQL_SWSDEFAULT]]
			* [[PQL_DWSQUOTA]]
			* [[PQL_DWSEXTENT]]

			When a batch queue is created, the DCL command INITIALIZE/QUEUE establishes the default values for jobs with the /WSDEFAULT, /WSQUOTA, and /WSEXTENT qualifiers. However, you can set these qualifiers to defer to the user’s values in the UAF record. When a batch job runs, the values may have been lowered by the corresponding qualifiers on the DCL commands SUBMIT or SET QUEUE/ENTRY

			The following guidelines are suggested by the [https://www.vmssoftware.com/pdfs/HP_branded_docs_1st_batch/OpenVMS_Performance_Management_manual.pdf OpenVMS Performance Management Manual]] for initial working set characteristics:

			* Set [[WSMAX]] at the highest number of pages required by any program.
			* In [[SYSUAF\|the user record]], set WSDEFAULT at the median number of pages required by a program that the user will run interactively. Set WSQUOTA at the largest number of pages required by a program that the user will run interactively. Set WSEXTENT at the largest number of pages you anticipate the process will need. Be as realistic as possible in your estimate.
			* On the batch queues for user-submitted jobs, set WSDEFAULT at the median number of pages required. Memory Management Concepts 3–5 Memory Management Concepts 3.4 Initial Working Set Quotas and Limits Set WSQUOTA to the number of pages that will allow the jobs to complete within a reasonable amount of time. Set WSEXTENT (using the DCL command INITIALIZE/QUEUE or START/QUEUE) to the largest number of pages required. This arrangement effectively forces users to submit large jobs for batch processing because otherwise, the jobs will not run efficiently. To further restrict the user who attempts to run a large job interactively, you can impose CPU time limits in the [[SYSUAF\|UAF]].

	=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]

Darya.zelenina: fixed a link

2019-06-04T19:31:49Z

fixed a link

← Older revision		Revision as of 19:31, 4 June 2019
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	=Working Set Limits=		=Working Set Limits=

	Working set limits are established from [[~~UAF~~]]:		Working set limits are established from [[SYSUAF]]:
	* WSDEFAULT (working set default) is the number of pages allocated to a starting process		* WSDEFAULT (working set default) is the number of pages allocated to a starting process
	* WSEXTENT (working set extent) is the number of pages that a working set can grow to if this memory is available and it may borrow more pages.		* WSEXTENT (working set extent) is the number of pages that a working set can grow to if this memory is available and it may borrow more pages.

Darya.zelenina: Created page with "A '''working set''' is a set of memory pages that a process is allowed to use. =Working Set Limits= Working set limits are established from UAF: * WSDEFAULT (working se..."

2019-06-04T14:18:20Z

Created page with "A '''working set''' is a set of memory pages that a process is allowed to use. =Working Set Limits= Working set limits are established from UAF: * WSDEFAULT (working se..."

New page

A '''working set''' is a set of memory pages that a process is allowed to use.

=Working Set Limits=

Working set limits are established from [[UAF]]:
* WSDEFAULT (working set default) is the number of pages allocated to a starting process
* WSEXTENT (working set extent) is the number of pages that a working set can grow to if this memory is available and it may borrow more pages.
* WSQUOTA (working set quota) is the number of pages guaranteed to an active process

However, they may not be set lower than the following system parameters:
* for interactive processes:
** [[PQL_MSDEFAULT]]
** [[PQL_MWSQUOTA]]
** [[PQL_MWSEXTENT]]
* for detached processes:
** [[PQL_SWSDEFAULT]]
** [[PQL_DWSQUOTA]]
** [[PQL_DWSEXTENT]]

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