Tommy:
I wouldn't automatically assume that your transaction timeouts and 100% cpu
utilization are attiributable valid conditions or that upgrading the cpu
will necessarily help the situation.
I would suggest that before you do the upgrade, check out SMF for excessive
spin records and if you see any, rack down the reasons first. Here's a
scenarion I have seen more than once:
I use to work for a vendor who had a customer with a transaction running on
a 4-way and because it ran at 100% all the time, they figured they were out
of gas. So we sold them a 10 way to have available for the Christmas rush
and the week after we installed it, we varied one, then 2, then 3 ......
engines online. Each instantly went to 100%. After loooking into the
problem, I found that the application acquired a lock and then did a huge
search, inserted a record in a Linked List, then released the lock. Since
the whole application consisted of the same transaction, all other
processors were spinning waiting for the same lock to be released. After we
fixed it, they didn't even require the 4 way.
I'm not saying this is your problem, just a scenario that I had seen several
times and one that is easy to recognize by looking ath SMF for excessive
spin records. Just a thought.
Bill
From: Tommy Tsui <[EMAIL PROTECTED]>
Reply-To: IBM Mainframe Discussion List <IBM-MAIN@BAMA.UA.EDU>
To: IBM-MAIN@BAMA.UA.EDU
Subject: Each CPU usage
Date: Fri, 24 Aug 2007 22:25:43 +0800
Hi all,
Our shop planning to upgrade the CPU from 2064-2C9 to 2094-710, how can we
measure each CPU usage. In 2064-2C9 CICS almost use 100% on each
CPU..running CICS and some transaction time out. We expect it will have
improvment after upgraded to 2094-710 becuase each CPU mips have increased
from around 235 to 500. Agreed?
we are using RMF APPL% divide no of CPU to get each CPU usage %
Anyone can share
Thanks
Tommy
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