Tom,
You are correct that these IEAOPTxx parameters (added in z/OS V1R6)
worked essentially as you described when zAAP was introduced.
However, these descriptions are a bit dated. The meaning of the
parameters was changed with z/OS V1R7, and the parameters were
drastically changed with z/OS V1R8 (and with the ptfs that backfit
z/OS V1R8 logic to V1R6 and V1R7).
IFACROSSOVER now is ignored completely and is not in IEAOPTxx with V1R8.
Regardless of IFAHONORPRIORITY, zAAP eligible work will execute only
on zAAP unless Alternate Wait Management (as applied to the zAAP)
decides that the zAAP "needs help" to get the work done. Only if the
zAAP "needs help" will z/OS Dispatcher consider zAAP work for
dispatching to CP. Even though there is not a "ZIPHONORPRIORITY"
parameter, zIIP dispatching works as though "YES" had been specified.
Additionally, see ZAAPAWMT and ZIIPAWMT in IEAOPTxx of z/OS V1R8 for
additional possible specifications.
Regards,
Don
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Don Deese, Computer Management Sciences, Inc.
Voice: (703) 922-7027 Fax: (703) 922-7305
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At 11:42 PM 4/12/2007, you wrote:
Something else to consider are two IEAOPTxx parameters for WLM control of
zAAP eligible workloads.
IFACROSSOVER controls whether standard CPs will be used for zAAP eligible
work. If YES (the default), then standard CPs will be used along with zAAP
CPs. zAAP CPs will be preferred, but standard CPs are not excluded from
consideration based on workload. If NO, then standard CPs are not
considered for zAAP eligible work unless there are no zAAP CPs present.
IFAHONORPRIORITY controls the workload priority settings for zAAP eligible
work that is executed on standard CPs. If YES (the default), then all work
on a standard CP will execute based on WLM assigned priority. If NO, then
all zAAP eligible work that is assigned for execution on a standard CP will
be scheduled at a lower priority than non-zAAP eligible workloads.
I believe these parameters were added with z/OS 1.7.
Tom Moulder
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