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Most efficient copy utility

 
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mark loftus

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Joined: 21 Jun 2006
Posts: 9

PostPosted: Fri May 23, 2008 7:53 pm    Post subject: Most efficient copy utility
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I would like to try to establish what is the most cpu efficient way of copying a DSN through batch. If anyone has already done any research on this i would be very interested in the results. A league table of results would be very useful.
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enrico-sorichetti

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Joined: 14 Mar 2007
Posts: 10232
Location: italy

PostPosted: Fri May 23, 2008 8:26 pm    Post subject: Reply to: Most efficient copy utility
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Well said, Give it a try and let us know...

program/utilities to test
- IDCAMS
- IEBGENER
- ICEGENER
- DFDSS
- RYO assembler ( excp level )

run with different blocksizes, different lrecls
post the results
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Sat May 24, 2008 12:35 am    Post subject:
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Hello,

Quote:
what is the most cpu efficient way of copying a DSN through batch
Usually, cpu usage is not an issue when copying data. The process is nearly always i/o bound. . .
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Bill Dennis

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Joined: 17 Aug 2007
Posts: 562
Location: Iowa, USA

PostPosted: Sat May 24, 2008 1:40 am    Post subject:
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When comparing to IEBGENER and RYO, we found ICEGENER to be the least CPU and lowest EXCP counts for larger file sizes but it was slightly worse than RYO for very small files.
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dick scherrer

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PostPosted: Sat May 24, 2008 1:57 am    Post subject:
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Hello,

ICEGENER invokes the sort.

On many systems, IEBGENER executions are intercepted and sort/copy is used instead of GENER.

The sort products (DFSORT & Syncsort) have more "start-up" costs, but more than make up for it when processing anything other than small files.
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Douglas Wilder

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Joined: 28 Nov 2006
Posts: 305
Location: Deerfield IL

PostPosted: Sat May 24, 2008 2:34 am    Post subject:
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In very limited testing of copying PS files My results of relative cost at this shop were:
Repro 1.0 Gener 1.63 SrchPrnt .99 DF Sort .39
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gcicchet

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Joined: 28 Jul 2006
Posts: 1703
Location: Australia

PostPosted: Sun May 25, 2008 6:38 am    Post subject:
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Hi,

see this linkhttp://ibmmainframes.com/viewtopic.php?t=25928&highlight=gerry+iebgener+idcams


Gerry
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Terry Heinze

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Joined: 14 Jul 2008
Posts: 1249
Location: Richfield, MN, USA

PostPosted: Tue Jul 15, 2008 3:16 am    Post subject:
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I've read a lot of discussions of this over the years and the general consensus is that SORT (whether it be DFSORT, Syncsort, or CA-Sort) usually outperforms the rest. As enrico suggested, give them all a try and report back.
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