You got to understand that these numbers are all basically ball point figures. They closely match that 4 MB per user for tomcat and IIS servers that I had heard about years ago when tomcat and IIS servers at that time were usually defaulted to use a max heap of 512 MB. Raising it higher than that could cause the JVM's those days to crash..
Per user consumption since then may have grown with the growth in overheads, with web applications growing thicker and thicker. I have safely raised a JVM max size to about 1664 MB on servers having about 4 GB memory without crashing the JVM in recent pasts.. It would be interesting to know what max memory must one consider per user session given current limitations.. Joe -----Original Message----- From: SUBSCRIBE arslist Sathish [mailto:[email protected]] Sent: Wednesday, June 02, 2010 3:43 AM To: [email protected]; Joe DeSouza Cc: SUBSCRIBE arslist Sathish Subject: Re: MidTier / Concurrent Users The number of concurrent users depends on the Server, we had a BMC architecture visit sharing the view that tomcat can hold 100-150 users where as IBM Websphere 6.x can hold 200-250 concurrent users after which the performance starts to degrade... The direction was to have multiple mid tier instance load balanced and restarting once a week so that the JVM doesn't get full. Hope this helps!! _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org attend wwrug10 www.wwrug.com ARSlist: "Where the Answers Are"
