Hi Gary, We had a similar problem back at my last place and *sucks the life out of the machine* is about right. Sounds like it could be a storage leak/creep within the heap that is causing the Java heap to go into more frequent garbage collections, especially if the heap is lightly allocated - hopefully it's at least 512 MB or above, as free space diminishes over time to the point where a compaction of the Java heap may be occurring. The compaction process takes considerable CPU to complete. I'm not sure of the reporting at this point with version 6 of WAS but turning on verbose GC, garbage collection, may shed some light on this anomaly and if it is indeed heap space related. BTDTGTS. Of course this could also be a runaway thread, bad logic, in which case you'll need some tracing to find the culprit but would lean on the above if it is happening, like, late afternoons around the same time. I also wonder if log offloads might be causing this but I can't seem to remember if this was a cause of significant CPU within WAS. I'm sure we'll get more elegant responses in the morning. A bit off topic, sorry, I just got done watching the Forbin Project with my son, great movie, I forget who recommended it but thanks.... Gary Green <[EMAIL PROTECTED]> wrote: If someone knows where I should ask this question, please tell me where to go. ;)
Otherwise... I was chatting with the manager of the tech support group at another company and he was telling me that in his shop they experience a terrible slowdown in WebSphere most afternoons; "sucks the life out of the machine" comes to mind. They do not have anyone that does performance or capacity work to "run the numbers"; and they collect very little SMF data even if they did or knew how to "run the numbers". He thinks it's the application programmers poorly written code, probably Java doing some daily end of day stuff. To make matters worse, they are still on 1.4, with plans to make a brief stopover on 1.7 before heading off to 1.9. They are pretty much a vanilla IBM shop with a couple of DB2 V7 production regions a couple of production CICS regions and some/few regions each for QA, Dev and testing. I think he said WebSphere was... version 6 if that makes sense... (I am not conversant in WebSphere). They are on a ~480 mip Z9. I know this is not really much to go on but does anyone have any suggestions I could pass along? Perhaps some insight or suggested diagnostic processes? Gary Green While the big event is over, there is still time for you to help me with my efforts to assist those stricken with cancer! Please support my efforts by visiting: http://www.active.com/donate/tntsonj/tntsonjGGreen Thank you. ---------------------------------------------------------------------- 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
