ZPAGEOPT parameter: Difference between revisions

Revision as of 15:22, 22 July 2015

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:

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 24: / Line 24: @@
 <tr class="head"><th>Setting</th><th>Meaning</th></tr>
-<tr><th align="right"><var>X'0001'</var></th><td>Use 1MB pages for servers above the bar.</td></tr>
+<tr><th><var>X'0001'</var></th><td>Use 1MB pages for servers above the bar.
+<p>
+Any server areas allocated above the bar (swappable (<var>[[SERVGA parameter|SERVGA]]</var>) or non-swappable (<var>[[SERVNSA parameter|SERVNSA]]</var>)) 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.
+</p></td></tr>
 <tr><th align="right"><var>X'0002'</var></th><td>Use 1MB pages for buffers above the bar.</td></tr>