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High number of service units when dfsort use Hiperspace

 
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Adam

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Joined: 17 Jun 2005
Posts: 7

PostPosted: Tue Nov 30, 2010 2:45 pm    Post subject: High number of service units when dfsort use Hiperspace
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Hi,
we've migrated from DB2 v9 CM to NFM on one test lpar.
Now our sorts "likes" hiperspace workfiles and reports high number of service units. Before that they choose rather other types of workfiles.
For example the same sort steps before and after migration:
Code:
STEPNAME PROCSTEP    RC   EXCP   CONN    TCB    SRB  CLOCK   SERV  WORKLOAD  PAGE  SWAP   VIO SWAPS
SRT(CM)              00   122K  60898    .12    .00     .6   780K  TSTBAT       0     0     0     0
SRT(NFM)             00   120K  27582    .11    .00     .7 10269K  TSTBAT       0     0     0     0   

(SRT(CM) use Data Space workfiles. Dfsort V1R5, z/OS 1.9)

If a batch jobs are rated for the SU i'ts not so good.

What can be cause?
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Dave Betten

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Joined: 24 Jan 2006
Posts: 26

PostPosted: Wed Dec 01, 2010 2:35 am    Post subject: Reply to: High number of service units when dfsort use Hiper
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My guess is that there is now more storage available on the system so DFSORT is exploiting it for Hiperspace sorting. If you want to restrict DFSORT so that it cannot use available central storage fo sorting, you can modify your installation default like EXPMAX from the shipped default of MAX to something more restrictive. If you want to disable it completely, set EXPMAX=0.
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Adam

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Joined: 17 Jun 2005
Posts: 7

PostPosted: Wed Dec 01, 2010 5:40 pm    Post subject: Reply to: High number of service units when dfsort use Hiper
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Thanks for the reply and tips, Dave.
I decided to use HIPRMAX=0 to disable Hipersorting.
An additional unpredictable HPT overhead distorted our batch tests results.
I concerned to miss an unknown APAR or PTF so my subject ...
Regards
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