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Reduce CPU time

 
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Andy85

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Joined: 25 Dec 2008
Posts: 35
Location: India

PostPosted: Thu May 21, 2009 1:38 pm    Post subject: Reduce CPU time
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I would like to know what all factors contribute to CPU time for a job.If a job is scheduled in CA7 scheduler, does it contribute to CPU time? In what ways can I reduce CPU time for a job without making changes to the programs in that job?

Thanks in advance.

Andy.
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enrico-sorichetti

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Joined: 14 Mar 2007
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PostPosted: Thu May 21, 2009 1:42 pm    Post subject: Reply to: Reduce CPU time
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the way a job is scheduled has nothing to do with resource consumption by the job itself

You cannot do it <full stop>

if You want to split hair there might be a very small overhead ( at step and job termination )
due to interfacing with the scheduling system ( any of them )
but I would not call it a resource killer
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expat

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PostPosted: Thu May 21, 2009 2:20 pm    Post subject:
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I/O is the first place to look, but even that may lead to program changes at some further point.
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Andy85

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PostPosted: Thu May 21, 2009 2:55 pm    Post subject:
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expat wrote:
I/O is the first place to look, but even that may lead to program changes at some further point.


I read at some place that I/O leads to increase in execution time and not to CPU time. I would like to know the different factors affecting CPU time
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Robert Sample

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PostPosted: Thu May 21, 2009 2:56 pm    Post subject:
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CPU time is consumed by the program doing processing on data. It is pretty much impossible to have any significant impact on CPU time without making program changes. So either plan on making program changes or give up the idea of reducing CPU time consumption for that job.
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