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Paul,
For cases like this, you really should open an IBM Support incident (PMR) and try to work through the issue with IBM technical support, so they can determine what went wrong and why.
Mark S. Waterbury
On Tuesday, April 30, 2019, 9:52:14 AM EDT, Paul Roy <Paul.Roy@xxxxxx> wrote:
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
midrange.com
