Hi, We are a call centre and the application is a scripting tool for outbound calling. I've seen over 300G an hour of memory allocated with 100 users and we need to support well over 200. With that much memory being consumed it obviously garbage collects pretty much constantly. A very low percentage of the objects make it to the old generation so the young generation garbage collection is crippling the box, particularly if it has a busy spell.
I believe a lot of the memory is in the sessions which seem to be a fairly substancial size. The app also does a lot of XML parsing and I'm sure there is a little too much String concatenation in there as well. I'm not sure of the load in terms of requests per second but i'd imagine up to 50 but more likely an average of 10-20 (this is purely guesswork though). Currently supporting about 100 users we've had the most success by fixing the eden space at 384M and not using the survivor spaces. Using the ParNewGC with 4 threads and the CMS collector in the old generation. Anything else i've missed? -----Original Message----- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: 13 August 2004 17:58 To: Tomcat Users List Subject: RE: [OT] - JVM Max Heap Size on Linux Hi, Just out of curiosity, what app(s) are you running that need a heap greater than 2GB? Or what load on those apps? You obviously don't need to give confidential details, I'm just curious about the type of app and its architecture. Yoav Shapira Millennium Research Informatics -----Original Message----- From: Dale, Matt [mailto:[EMAIL PROTECTED] Sent: Friday, August 13, 2004 12:41 PM To: Tomcat Users List (E-mail) Subject: [OT] - JVM Max Heap Size on Linux Hi, Has anyone got around the maximum heap size of 2G on linux? We've got a new server with 12G of ram which was going to be used for an uber tomcat but this plan may have to be changed if we can't get more than 2G of memory used for the JVM. Ta Matt
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