AMPSUBZ parameter

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Number of active zIIP eligible subtasks

Summary

Default value
None
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.

AMPSUBZ specifies the number of active zIIP subtasks.

Note: MP subtasks and zIIP subtasks may be used together. Therefore, AMPSUBS, NMPSUBS, AMPSUBZ and NMPSUBZ may all be greater than zero. However, to avoid unnecessary overhead:

  • Do not set AMPSUBS greater than the number of central processors actually available.
  • Do not set AMPSUBZ greater than the number of zIIP processors actually available.

For more information about zIIP processing, refer to Offloading Model 204 work to zIIP processors.