MPSYS parameter

From m204wiki
Revision as of 16:36, 30 March 2017 by ELowell (talk | contribs) (added missing sentence)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

MP/204 system flags


Default value
Parameter type
Where set
On User 0's parameter line or reset by system manager
Related products
Model 204 V5.1


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

This parameter is ignored when Model 204 is not running with MP/204 enabled.

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 maintask 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.