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mark loftus
New User
Joined: 21 Jun 2006
Posts: 9
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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
Superior Member
Joined: 14 Mar 2007
Posts: 10888
Location: italy
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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
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19243
Location: Inside the Matrix
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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
Active Member
Joined: 17 Aug 2007
Posts: 562
Location: Iowa, USA
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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
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19243
Location: Inside the Matrix
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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
Active User
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Joined: 28 Nov 2006
Posts: 305
Location: Deerfield IL
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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
Senior Member
Joined: 28 Jul 2006
Posts: 1702
Location: Australia
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Terry Heinze
JCL Moderator
Joined: 14 Jul 2008
Posts: 1248
Location: Richfield, MN, USA
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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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