Hi. We've been running performance testing on our web application on one of our production servers lately and have encountered an interesting performance item. It is probably not related to JBoss, but I thought this community may have some interest and possibly some insight into this issue.
We have an application which uses a large number of Stateless Session Beans and no Entity Beans with a Tomcat web frontend. We've been testing it with the Radview Webload product. We ran into a problem with our testing where the JMS implementation would stall (a known issue fixed in 3.2.3) under heavy load so in order to determine where the problem was, we setup the jvm so we could connect with a remote debugger. We fixed the jms problem but left the server in debug mode and continued our performance tests. We would generally get to about 100 users before we maxed out the CPU. We then noticed that the debug info was still in the start script so we removed it. We could now only get to about 30 users before hitting 100% CPU. This was very repeatable, and finally we took everything off the command line and it turned out the "-debug" flag is all we needed to make the performance reach it's previous levels. Has anybody seen this before? Any ideas why having the jvm in debug mode would increase performance? system specs: os: SunOS xxx.xxx.xxx.xxx 5.8 Generic_108528-29 sun4u sparc SUNW,Sun-Fire-880 jvm: Java HotSpot(TM) Client VM (build 1.4.1_01-b01, mixed mode) Pete. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3836978#3836978 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3836978 ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click _______________________________________________ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
