Something like this may have happened to others, but I thought I post it just in case. I might help in your analysis if you get a similar problem.
We recently had a situation where an application system, PEP Plus, was experiencing problems that appeared to be CPU related even though we had plenty of CPU resources on our production environment. This particular application has a job that kicks off about every 4 hours. It then internally kicks off other jobs and waits for them to complete. Normally these tasks run in less than a minute, but at the problem times they could take up to 20 minutes. The master task would time out waiting for the daughter tasks to complete. As I said we had plenty of CPU on our production LPAR. Well, we are soft capped and since we are on z/OS 1.7 we have to cap by LPAR. What was happening is that our test LPAR was hitting the cap hard. In fact it was hitting it so hard that everything, including tasks running in SYSTEM service class, were slowing down considerably. What was causing the problem on the production system was that GRS on that system was waiting for a response from GRS on the test system. Since we didn't have RMF Monitor III running continually at the time (this is being changed at my insistence) I couldn't use that to analyze this. Someone here saw the relationship between the test system hitting the cap and PEP Plus having problems. I then did an analysis on the test system service classes and saw that the PIs were terrible even for things running in SYSTEM. I just thought that this might be of interest to any performance analysts out there in case you run into something similar. I've also cross posted this to the MXG-L listserv. Tom Kelman Commerce Bank of Kansas City (816) 760-7632 ***************************************************************************** If you wish to communicate securely with Commerce Bank and its affiliates, you must log into your account under Online Services at http://www.commercebank.com or use the Commerce Bank Secure Email Message Center at https://securemail.commercebank.com NOTICE: This electronic mail message and any attached files are confidential. The information is exclusively for the use of the individual or entity intended as the recipient. If you are not the intended recipient, any use, copying, printing, reviewing, retention, disclosure, distribution or forwarding of the message or any attached file is not authorized and is strictly prohibited. If you have received this electronic mail message in error, please advise the sender by reply electronic mail immediately and permanently delete the original transmission, any attachments and any copies of this message from your computer system. ***************************************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
