MPSYS parameter

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Summary

Default value
0
Parameter type
System
Where set
On User 0's parameter line or reset by system manager
Related products
All
Introduced
Model 204 V6.1 or earlier

Description

This parameter indicates a system-wide MP/204 processing option and applies only to z/OS.

Setting Meaning

Purpose

X'01' A thread should continue spinning on an MP lock even if it appears that the task holding the lock cannot be dispatched.

In many situations, continuing to spin provides better performance than doing an operating system wait for the lock to free up.

X'02'A thread should stay on the main task after getting a critical file resource.

To improve performance at an MP/204 site that is encountering a lot of task switching (a high STDEQ system statistic) and a lot of critical file resource conflicts.