ZPAGEOPT parameter: Difference between revisions

Revision as of 11:31, 14 December 2017

1 mb page areas

ZPAGEOPT is a User 0 parameter applicable to z/OS systems only.

ZPAGEOPT specifies the areas that should be allocated using 1MB pages.

The following settings are valid:

Note: Any non-zero setting of ZPAGEOPT fails if the containing load library is not APF authorized.

Setting	Meaning
`X'0001'`	Use 1MB pages for servers above the bar. Any server areas allocated above the bar (swappable (`SERVGA`) or non-swappable (`SERVNSA`)) will be allocated using 1MB pages. This improves LTB (look-aside translation buffer) hits by reducing the number and size of segment and page translation tables, resulting in a performance improvement for the Online.
`X'0002'`	Use 1MB pages for buffers above the bar.
`X'0004'`	Use 1MB pages for buffer hash cells above the bar.
`X'0008'`	Use 1MB pages for buffer control blocks above the bar.
`X'0010'`	Use 1MB pages for CCATEMP pages in storage above the bar.
`X'0020'`	Use 1MB pages for CCATEMP in storage control blocks.
`X'0040'`	Use 1MB pages for the record locking table when it resides above the bar.
`X'0080'`	Use 1MB pages for CCAAPSY (APSY saved compilations in storage above the bar). From V7.6 onwards, this allocation will not include Resident Requests (RESREQST).

@@ Line 18: / Line 18: @@
 <var>ZPAGEOPT</var> is a User 0 parameter applicable to z/OS systems only. </p>
 <p>
-<var>ZPAGEOPT</var> specifies the areas that should be allocated using 1MB pages.</p>
+<var>ZPAGEOPT</var> specifies the areas that should be allocated using [[Performance_monitoring_and_tuning#1MB_virtual_pages|1MB pages]].</p>
 <p>
 The following settings are valid:</p>