I have been doing RTFM on Jes Init & Tune Guide and find myself
back in a quandry. My original purpose was to get an ever changing list
of, overnight batch, critical path,jobs priority access to initiators
without changing their JCL manually. But here is what I read in the Guide
about WLM inits
Batch jobs that are part of a critical path, such as the overnight
?batch window? should remain in JES managed job classes.
Alignment of initiator mode and service classes: All jobs with the
same service class should be managed by the same type of initiation. For
example, if job classes A and B are both assigned to the HOTBATCH service
class, and JOBCLASS(A) is MODE=WLM, while JOBCLASS(B) is MODE=JES,
workload management will have a very difficult time managing the goals of
the HOTBATCH service class without managing class B jobs. Queue delay
measurements: If you have large job execution queues, the queue delay can
dominate the response time or velocity. This may cause the system to not
address other delays because it would not significantly affect the
performance index (PI). Response time does not include TYPRUN=HOLD or
JCLHOLD delays, but does include the following:
Operational delays (jobs or job class held by operator command)
System or resource affinity delay
Scheduling delay because of class limits, duplicate jobnames
Time waiting for an Initiator
What I currently have is a lot of jobs waiting for a class "Q"
initiator, and I want to get my "loved ones" to the init first. It looks
like using WLM to get my priority jobs to the initiator faster may totally
mess up WLM's calculations because it will start measuring all of that
Waiting for Init Time.
I think this puts me back at where I started. Perhaps what I need
is an Exit which can read a list of Jobs and raise their Input Queue
Priority. Can anyone suggest the "best" exit for this?
Brian Westerman <[EMAIL PROTECTED]>
Sent by: IBM Mainframe Discussion List <[email protected]>
12/03/2008 11:31 PM
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Re: /*PRIORITY change without JCL change
You could write it as either a JES input exit (or text) or an SMF exit,
either will work fine.
There are several samples on the CBT tape that you can use as a start, but
none that I'm aware of that do exactly what you want.
Why not use JES's WLM options instead?
Brian
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