MPOPTS parameter: Difference between revisions
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==Description== | ==Description== | ||
The <var>MPOPTS</var> parameter setting is used to tune system multiprocessing. The SOUL compiler strategy offloads as much work as possible to subtasks. You can | The <var>MPOPTS</var> parameter setting is used to tune system multiprocessing. The SOUL compiler strategy offloads as much work as possible to subtasks. You can reduce the scope of this subtask offloading by setting <var>MPOPTS</var> parameter to offload selectively for a particular section of code. | ||
By default, <var>MPOPTS</var> omits offloading for: | |||
<ul> | <ul> | ||
<li>Nested loops</li> | <li>Nested loops</li> | ||
| Line 22: | Line 24: | ||
</ul> | </ul> | ||
<p> | <p> | ||
<var>MPOPTS</var> applies only to z/OS. Its valid settings are: </p> | |||
<table> | <table> | ||
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<tr><th><var>X'04'</var></th> | <tr><th><var>X'04'</var></th> | ||
<td><code>MP=NO</code> [[ | <td><code>MP=NO</code> [[Performance monitoring and tuning#$Functions|$functions]]</td></tr> | ||
<tr><th><var>X'08'</var></th> | <tr><th><var>X'08'</var></th> | ||
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<tr><th><var>X'10'</var></th> | <tr><th><var>X'10'</var></th> | ||
<td>Field level update statements (<var>[[Data maintenance#Add statement|Add Field]]</var>, <var>[[Data maintenance#Change statement|Change Field]]</var>, <var>[[Data maintenance#Delete statement|Delete Field]]</var>)</td></tr> | <td>Field-level update statements (<var>[[Data maintenance#Add statement|Add Field]]</var>, <var>[[Data maintenance#Change statement|Change Field]]</var>, <var>[[Data maintenance#Delete statement|Delete Field]]</var>)</td></tr> | ||
<tr><th><var>X'20'</var></th> | <tr><th><var>X'20'</var></th> | ||
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</table> | </table> | ||
<p> | <p> | ||
An <var>[[ | An <var>[[MP Options statement|MP Options]]</var> SOUL statement can temporarily override the <var>MPOPTS</var> parameter. For more information on multiprocessing concepts and parameters, refer to [[Performance monitoring and tuning#Multiprocessing (MP/204)|Multiprocessing (MP/204)]].</p> | ||
[[Category:System parameters]] | [[Category:System parameters]] | ||
[[Category:Parameters]] | [[Category:Parameters]] | ||
Latest revision as of 23:20, 26 July 2018
MP user language options
Summary
- Default value
- X'7F'
- Parameter type
- User
- Where set
- User resettable
- Related products
- All
- Introduced
- Model 204 V4.1 or earlier
Description
The MPOPTS parameter setting is used to tune system multiprocessing. The SOUL compiler strategy offloads as much work as possible to subtasks. You can reduce the scope of this subtask offloading by setting MPOPTS parameter to offload selectively for a particular section of code.
By default, MPOPTS omits offloading for:
- Nested loops
MP=NO$functions- Mixed mode statements
MPOPTS applies only to z/OS. Its valid settings are:
| Setting | Meaning |
|---|---|
| X'01' | Loops containing serial statements |
| X'02' | Calls to subroutines containing serial statements |
| X'04' | MP=NO $functions |
| X'08' | Store Record and Delete Record statements |
| X'10' | Field-level update statements (Add Field, Change Field, Delete Field) |
| X'20' | Read, Print Screen, Print Menu, and Reread statements |
| X'40' | Read Image and Write Image statements |
| X'80' | Produce compilation warning messages for serial statements |
An MP Options SOUL statement can temporarily override the MPOPTS parameter. For more information on multiprocessing concepts and parameters, refer to Multiprocessing (MP/204).