SCHDOFLZ parameter: Difference between revisions
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Revision as of 16:43, 27 August 2013
Threshold for activating zIIP subtasks
Summary
- Default value
- 2
- Parameter type
- System
- Where set
- On User 0's parameter line or reset by system manager.
- Related products
- All
- Introduced
- Model 204 V7.4
Description
Applies to z/OS only
On a z/OS system, Model 204 zIIP support enables you to offload Model 204 work from regular processors to zIIP processors.
SCHDOFLZ specifies the target number of threads on the zIIP offload queue per active task. Setting this parameter makes the Model 204 zIIP subtask scheduler more responsive to instantaneous increases in load.
The default value of 2 means that if there are more than twice as many units of zIIP offloadable work waiting to be processed in a zIIP subtask as there are active subtasks, and fewer than AMPSUBZ subtasks are currently running, another zIIP offload subtask is activated.
SCHDOFLZ has no effect if MP/204 is not in effect in an Online (NMPSUBZ=0) or if the number of active subtasks (AMPSUBZ) is set to 0 or 1. (If AMPSUBZ=1, a zIIP subtask is activated as soon as there is any offloadable work and then runs until there is no more offloadable work for it to process.)