I'm not a performance or tuning expert.
My thoughts:
1 - review the tweak
2 - from your job log what steps used the most cpu ?
3 - can you compare to a job log made before the tweak ?
4 - maybe a more verbose job log could help ?
5 - use System I Navigator to look for recommended indexes (good general practice)
6 - run a job in debug mode to get access path recommendations
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of John R. Smith, Jr.
Sent: Friday, June 19, 2015 1:52 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Seconds used question
I agree that it is CPU seconds but what miscellaneous CPU seconds are being charged to my job.
The question came from a job that ran the 403 seconds. A minor tweak was make to one of the programs and it used 10 times as many CPU seconds. The first run was on a light day and the second run was on a heavily abused day so before I totally blame the tweak, I want to make sure there wasn't a bunch of misc system functions such as swapping that got added to my CPU seconds and skewed the numbers.
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Gary Thompson
Sent: Friday, June 19, 2015 2:57 PM
To: Midrange Systems Technical Discussion
Subject: RE: Seconds used question
I don't know, but if you have a job log print file for that job, look at start and end times - a little math should answer your question and, if memory serves, the job log shows net cpu seconds.
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of John R. Smith, Jr.
Sent: Friday, June 19, 2015 12:54 PM
To: midrange-l@xxxxxxxxxxxx
Subject: Seconds used question
The line in the joblog states
Job 999999/UUUUUUUUUU/JJJJJJJJJJ ended on 06/12/15 at02:36:42; 430.362 seconds used; end code 0
I have always thought this was CPU seconds used to execute the job but some questions have come up to make me wonder if it is more than that.
For example,
1) If the system is really bogged down and doing a lot of swapping,
does the CPU time spent swapping get added to this?
2) If the DASD is really bogged down, does that have any effect on this
number?
3) If there is a lock of a record and the program is in a LCKW state,
does that add any CPU overhead to my job (not sure if my program goes to sleep and the OS wakes it up when the lock frees or if my program is checking the lock status behind the scenes)?
Can someone provide a good explanation of this number and what else if anything other than my program instructions are included in it?
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