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Will Region size reduces IPF cost ?

 
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Geethanjali

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Joined: 24 Jan 2008
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Location: Chennai

PostPosted: Fri Feb 01, 2008 10:20 am    Post subject: Will Region size reduces IPF cost ?
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Can any one answer this quick question,

If we are increasing the value of Region parameter in Job card say ,from 8M to 64M in load jobs,Will this reduce/increase the CPU usage or impact job completion time?
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Srinivasa Rao

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Joined: 21 Jun 2005
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PostPosted: Fri Feb 01, 2008 7:37 pm    Post subject:
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Region parameter will not effect CPU and time. It is used to allocate some storage for job execution.
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dick scherrer

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PostPosted: Fri Feb 01, 2008 10:10 pm    Post subject:
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Hello,

Quote:
Will this reduce/increase the CPU usage or impact job completion time?
It should not increase the amount of cpu time used.

It may or may not improve performance depending on how the additional memory is used (if is it used at all). If the additional memory is used n place of what is currently done using more i/o, the amount of i/o may decrease and the overall performance improved.
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enrico-sorichetti

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PostPosted: Fri Feb 01, 2008 10:16 pm    Post subject: Reply to: Will Region size reduces IPF cost ?
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it depends on what You mean by cost icon_biggrin.gif

in terms of billing (real or virtual )
You will be billed certainly for the storage used ( real+virtual )
+ CPU +I/O operations +tape mounts +.... add as many items You like

I have seen cases were the user would be billed also for the storage requested
( in order to to have the end users aware of what they were doing )
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Geethanjali

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PostPosted: Mon Feb 04, 2008 9:59 am    Post subject: Reply to: Will Region size reduces IPF cost ?
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Thanks a lot for ur replies,

dick scherrer,

You have mentioned as following,

'If the additional memory is used n place of what is currently done using more i/o, the amount of i/o may decrease and the overall performance improved'

Is there any way to find the amount of I/O used in a load job?
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dick scherrer

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PostPosted: Mon Feb 04, 2008 8:23 pm    Post subject:
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Hello,

Pretty much all system usage is "trackable".

Quote:
Is there any way to find the amount of I/O used in a load job?
Different kinds of "load jobs" are tracked differently.

I'd suggest you talk with either the storage management, performance measurement, or capacity planning people that spport your system and see iof there might already be something in place that will provide the info you need.
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