XMEMOPT parameter: Difference between revisions

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m (Default is now 4 if M204XSVC is linked into the nucleus)
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<tr><th align="right"><var>X'04'</var></th><td>Forces initialization of cross-memory environment. </td></tr>
<tr><th align="right"><var>X'04'</var></th><td>Forces initialization of cross-memory environment. </td></tr>
<tr><th align="right"><var>X'03'</var></th><td>Invokes both TIMER PC and IOS BRANCH ENTRY.</td></tr>
<tr><th align="right"><var>X'03'</var></th><td>Invokes both TIMER PC and IOS BRANCH ENTRY.</td></tr>
<tr><th align="right"><var>X'02'</var></th><td>Invokes IOS BRANCH ENTRY (recommended for z/OS).</td></tr>
<tr><th align="right"><var>X'02'</var></th><td>Invokes IOS BRANCH ENTRY (recommended for z/OS). As of Model 204 version 7.6, the X'02' setting is required for zIIP processing.</td></tr>
<tr><th align="right"><var>X'01'</var></th><td>Invokes TIMER PC</td></tr>
<tr><th align="right"><var>X'01'</var></th><td>Invokes TIMER PC</td></tr>
<tr><th align="right"><var>X'00'</var></th><td>Disables TIMER PC and IOS BRANCH ENTRY.</td></tr>
<tr><th align="right"><var>X'00'</var></th><td>Disables TIMER PC and IOS BRANCH ENTRY.</td></tr>

Revision as of 22:03, 13 November 2015

Cross-memory PC options

Summary

Default value
4 if M204XSVC is linked into the nucleus
Parameter type
System
Where set
On User 0's parameter line
Related products
All
Introduced
Model 204 V6.1 or earlier

Description

The Model 204 cross-memory services options that can be invoked during execution of Model 204

This parameter applies only to z/OS.

The XMEMSVC parameter is used with any of the nonzero settings.

Valid settings of XMEMOPT are:

SettingMeaning
X'80'Activates CRAM-XDM.
X'20'Use SUSPEND / RESUME instead of WAIT / POST for communication between Model 204 real subtasks. This option may reduce operating system overhead slightly.
X'04'Forces initialization of cross-memory environment.
X'03'Invokes both TIMER PC and IOS BRANCH ENTRY.
X'02'Invokes IOS BRANCH ENTRY (recommended for z/OS). As of Model 204 version 7.6, the X'02' setting is required for zIIP processing.
X'01'Invokes TIMER PC
X'00'Disables TIMER PC and IOS BRANCH ENTRY.

Note: VIO is incompatible with IOSBE and EXCPVR.