AMPSUBZ parameter

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.

Do not set AMPSUBZ greater than the value of NMPSUBZ.

Note: MP subtasks and zIIP subtasks may be used together. Therefore, AMPSUBS, NMPSUBS, AMPSUBZ and NMPSUBZ can 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.