System z Integrated Information Processor (zIIP)

To assist in planning for zIIP, components of z/OS have been enhanced to report both projected zIIP usage and actual zIIP usage.
The projected usage function (PROJECTCPU) is intended to gather information about CPU time spent executing code which could potentially execute on zIIPs.
See Capacity Planning for zAAP and zIIP Specialty Engines
Note

• Setting the IEAOPTxx parmlib member option PROJECTCPU=YES directs z/OS to record the amount of work eligible for zIIP [and zAAP] processors. SMF Record Type 72 subtype 3 is input to the RMF post processor. The Workload Activity Report lists workloads by WLM service class. In this report the field APPL% IIPPCP indicates which percentage of an processor is zIIP eligible, (APPL% AAPCP indicates which percentage of a processor is zAAP eligible). SMF Record Type 30 provides more detail on specific address spaces. Finding values as little as 25% for APPL% AAPCP or AAPL% IIPCP can make a new zAAP or zIIP processor worth your while.

For customers that have installed zIIPs, the reporting functions can provide current zIIP execution information that can be used for optimizing current configurations or for predicting potential future usage.
To assist in planning for zIIP Assisted IPSec, please see the technical papers on the underResources for basic sizing guidance for your workload.

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