If the Specialty Engine is faster than the CP engine,
the normalized CPU time for the Specialty Engine can
easily exceed the wall time.
>From MXG Newsletter FIFTY-TWO from 2008, although
the variable names are MXG-Specific:
12. zIIP and zAAP measurements when they are faster than CPU engines.
When specialty engines are faster than the speed of your CPs, there
is a normalization factor to convert the recorded seconds to their
NORMALIZED (EQUIVALENT) time, as if they had executed on your CPs.
In all MXG workload datasets, TYPE72GO and RMFINTRV, (and TYPE30),
(and DB2ACCT), all time variables for zIIPs and zAAPS are NORMALIZED
seconds, and all of the service units are segregated by engine type.
However, the IBM RMF reports present these data quite differently.
This system has the normalization factor, R723NFFS=569/256=2.222,
that is, one second of zIIP is equal to 2.222 seconds of CP time.
====================================================================
MXG Dataset TYPE72GO dataset values:
====================================================================
SERVICE CPUUNITS ZIPUNITS CPUTCBTM CPUZIPTM
3,932,091 1,793,920 2,137,167 178.92 213.16
====================================================================
RMF WORKLOAD REPORT:
====================================================================
Under "SERVICE TIMES", the RMF "CPU" value of 392.9 seconds is the
total of the real CPU time on CP engines, plus the NORMALIZED CPU
time on the zIIP and zAAP engines; it is NOT the CPU "TCB" time.
( 392.9 = 178.92 + 213.16 "RMF CPU" = CPUTCBTM + CPUZIPTM )
But also under "SERVICE TIMES", the RMF "IIP" (zIIP) value of 96.1
seconds is the UN-NORMALIZED, raw, seconds on the zIIP engine.
And the RMF "AAP" value for zAAPs is also the UN-NORMALIZED value.
And under "SERVICE", the RMF "CPU" value of 3931K is the TOTAL
SERVICE units from CPs, zIIPs, and zAAPs.
REPORT BY: POLICY=OWL WORKLOAD=CSSDDF
TRANSACTIONS ---SERVICE---- SERVICE TIMES ---APPL %---
AVG 0.23 IOC 0 CPU 392.9 CP 4.98
MPL 0.23 CPU 3931K SRB 0.0 AAPCP 0.00
ENDED 51 MSO 0 RCT 0.0 IIPCP 0.07
END/S 0.01 SRB 0 IIT 0.0
#SWAPS 0 TOT 3931K HST 0.0 AAP N/A
EXCTD 0 /SEC 1092 AAP N/A IIP 2.67
AVG ENC 0.23 IIP 96.1
====================================================================
While the workload datasets have normalized CPU time, in all of the
"hardware" datasets, TYPE70, TYPE70PR, ASUM70PR etc., the CPU times
for the zIIP and zAAP engines are the raw seconds of CPU Dispatch
Time on those engines, and is NOT normalized. As a result, then,
the total ZIPACTTM recorded in TYPE70 for the above system for the
day was 10,887 seconds, but the total CPUZIPTM in TYPE72GO for the
day was 23,079 seconds.
Those 10,887 raw hardware seconds would be 24,190 normalized seconds
so the zIIP capture ratio at this site is 23079/24190 = 95.4%.
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