Re: Inconsistent performance

Hello,

Since a few weeks after installing cumpack 18249 at V7R2, we face
inconsistent performance problems...
the same job can take from 3 to 40 minutes in equivalent situation...
the difference from the component report looks in the number of physical
I/O... and the CPU.
job A : 580000 logical I/O ... 222500 Sync I/O ... 117500 Async I/O
perm write 95654 CPU 766 sec (0,29%) duration 25 minutes
job B : 570500 logical I/0 ... 73000 Sync I/O ... 27000 Async
I/O perm write 19051 CPU 8 sec (0,003%) duration 3 minutes

we have 10 jobs started in parallel (each one is handling 1/10 of the db
selected on the last digit of the contract number - the selection is made
with an OPNQRYF ) so the volume and the process in roughly the same in all
jobs. The same process takes 6 CPU sec one day and 600 CPU secs the other
day... this was running smoothly before and the duration is now
unpredictable.

I do not understand what can cause the difference.
What can explain the difference ... same process same number of logical
I/O but much more physical disk I/O...

any suggestion welcome

Thanks

Paul


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