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DSNUTILB - parallelism


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vasanthz

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Joined: 28 Aug 2007
Posts: 1692
Location: Tiruppur, India

PostPosted: Mon Jan 19, 2015 10:16 pm
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Hi,
I am a DB2 novice & pardon my terminology.
In some of the DB2 load jobs, PGM=DSNUTILB they have CPU time higher than the elapsed time, which suggest that multiple threads are running in parallel.

Could you please let me know where I can see how many TCBs are concurrently active for a particular DB2 job?

Any specific field in SMF? or can we see it in the job itself?

Thanks & Regards,
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8574
Location: Dubuque, Iowa, USA

PostPosted: Tue Jan 20, 2015 4:22 am
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If your site uses zIIP processors, then you would need to look at those fields in the SMF records as well. I don't know of anywhere that records the number of TCBs in use, although it is possible the value is somewhere in the SMF records.

Also note that zIIP processors can run at higher speeds than your CP engine. zIIP processors can run parallel DB2 tasks so there's another source of parallelism.
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vasanthz

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Joined: 28 Aug 2007
Posts: 1692
Location: Tiruppur, India

PostPosted: Tue Jan 20, 2015 11:02 pm
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Hi Robert,
Thank you for your thought.
We have zIIP processors, but the Central processor CPU time was higher than the elapsed time.

To check the number of TCBs active I looked at the SMF TYPE 30 records but unable to find a breakup of all the TCBs that were active. It appears type 30 has only a summarised data of all the TCBs. :S No luck here

Regards,
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vasanthz

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Joined: 28 Aug 2007
Posts: 1692
Location: Tiruppur, India

PostPosted: Thu Jan 22, 2015 12:18 am
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Hi,
The number of TCBs invoked & parallelism info were present in MXG DB2ACCT member. A huge relief after 4 days. :-)

Thanks & Regards,
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