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which job is doing bad?


IBM Mainframe Forums -> Testing & Performance
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baramesh

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Joined: 20 May 2008
Posts: 25
Location: bangalore

PostPosted: Sat Aug 14, 2021 8:46 pm
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I have a job that runs for 7 minutes and processed 10 records, and I have another job ran for the same7 minutes but processed 1000 records, how could I determine which is a bad performer?
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8699
Location: Dubuque, Iowa, USA

PostPosted: Sat Aug 14, 2021 9:01 pm
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Talk to your site support group and get their assistance. Your post lacks many critical details for anyone on this forum to assist you:
- each job "runs for 7 minutes" but is that elapsed time or CPU time (there is a major and distinct difference in the two)?
- what are you defining as "bad performer"? There are many, many, many ways to classify performance on a computer system (CPU usage, records processed per second of CPU time, I/O performed, data base accesses are just a few) and without defining what you're looking for either job could be a bad performer or a good performer.
- how are the jobs defined? If one of the jobs has 250 steps while the other job has 1 step and they both run "run for 7 minutes", you are pretty much comparing apples to kumquats.
- if you're looking at elapsed time, you need to quit doing so. IBM itself tells you that elapsed time for a job can vary drastically depending upon a large number of factors. At a previous employer, programmer compiles would typically complete in 5 minutes or less of elapsed time. However, when a compile was done during the month-end batch processing window, the elapsed time went up to 5 hours. Same job, same CPU usage, but very different elapsed times.
- is zIIP processing involved for one or both of the jobs?
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Willy Jensen

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Joined: 01 Sep 2015
Posts: 720
Location: Denmark

PostPosted: Sun Aug 15, 2021 2:25 pm
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From the outside you cannot tell, it will be down to the amount of processing done for those records. Talk to the designer of the job, s/he should have some idea.
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