ZIIPMODE control statement

Specifies whether IMS™ HP Load offloads eligible I/O workloads to zIIP processors.

This control statement is optional. If you do not specify this control statement, ZIIPMODE=NEVER is used.


              .-NEVER-.   
>>-ZIIPMODE=--+-COND--+----------------------------------------><

COND

Offloads VSAM I/O workloads to zIIP processors. COND is effective only when available zIIP processors are found. Otherwise, the job is run on the main CPs.

The following conditions must be satisfied to apply ZIIPMODE=COND:

The SGLXLOAD library of IMS Tools Base is specified to the STEPLIB.
The load module libraries of STEPLIB are APF authorized.
The High Performance I/O Driver is activated.

If the High Performance I/O driver is inactive for some reason, even if you specify ZIIPMODE=COND, ZIIPMODE=NEVER is applied.

NEVER

Does not offload any workload to zIIP processors. NEVER is the default to avoid unexpected performance degradation.

Tip: The default value of the ZIIPMODE control statement can be changed. For details, see Setting installation default options.