Barry Merrill wrote:

The contents of that SDSF CPU% field is changed, if your system
as any zAAPs (IFAs), per this note in MXG Newsletter FORTY-FIVE:


32. Where does IFA CPU time show up:

 f. SDSF display.  JOB-level data for CPU% includes both CP and IFA CPU
    percent, but a new IFA CPU column will eventually be added.
    The Bad News:  The CPU percent busy field in the top line of the
    display DOES (incorrectly?) include IFAs in the denominator, so a
    a two-CP one-IFA system with 100% in both CPs and 0% in the IFA
    displays CPU Busy of 66% on SDSF, because the capacity was based
    on three total engines, not the two CP engines.
      Unrelated to IFA, but it was just observed that the JOB %CPU
      includes the "Initiator" CPU time (CPITCBTM/CPISRBTM see ADOC30),
      the CPU time before your program actually starts executing, so
      you might see CPU time while watching a job that ultimately never
      records any CPU time in the IEF374I messages.

CPU-Time  = R791TCPU or ASCBEJST+ASCBSRBT+ASSBASST
ECPU-Time = R791TCPC or ASCBEJST+ASCBSRBT+ASSBPHTM
zAAP-Time = R791TIFA or ASSB_TIME_ON_IFA
GCP-Time  = R791TCP  or ASSB_TIME_ON_CP
zACP-Time = R791TIFC or ASSB_TIME_IFA_ON_CP

When calculating the utilization over the interval, CPU% and ECPU% are scaled to the value returned by ERBSMFI for total CPU busy. The others are not.

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