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 under Resources for basic sizing guidance for your workload.

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