MPSYS parameter
MP/204 system flags
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. |