On Thu, Jan 31, 2013 at 10:32 PM, Zoran Avtarovski <zo...@sparecreative.com> wrote: > > 1.The app has been running on Tomcat 7 in a virtualised linux environment > for about 4 months and the issue has been persistent through that time. > Prior to that it was running on a physical Windows server with no issues. > The move to linux coincided with the addition of a substantial amount of > WebServices functionality - consuming.
very interesting, stable on windows (without webservices footprint). what was your java -version details on windows, and what is your java -version details on linux? so the webservices functionality is 'new' software/code? was the code implemented well for GC? any use of threadlocals? i am only shooting from the hip, here, as I primarily listen in on topics here, and have limited experience with java and tomcat. > 2.The tomcat instance was originally running with a max of 6Gb of > allocated memory and it would crash almost daily. When we upped it to 11gb > the crashes reduced to about twice a week. > 3. Tomcat is configured with the following options export > JAVA_OPTS="-Xms256m -Xmx11460m -Djava.awt.headless=true > -XX:MaxPermSize=256M -XX:+CMSClassUnloadingEnabled > -XX:+UseConcMarkSweepGC" > 4. Xms and MaxPermSize were just reduced from 512m > 5. The app generally has about 50-100 concurrent users - the logs show > that Tomcat can crash with as few as 20 users. I'm wondering if it could > be GC related as the crashes often follow periods of heavy use. > 6. The app is a struts2 based app using Spring 3.5 for dependancy > injection/ioc. this is good to know. have you seen/heard of similar reports from others using struts2 and spring 3.5 for dependancy injection/ioc? > > The problem with getting a thread dump is that high CPU usage is only a > spike and server freezes. CPU usage only goes above 5-10% when it's about > to crash. Support then reboot the server instances and off it goes. I've > tried to spend a few days just watching, but of course it didn't skip a > beat while I was monitoring. Is there a way to trigger gather relevant > data when Tomcat crashes? > > Z. > I searched tomcat user list, please see below, and consider what was mentioned there for troubleshooting this issue, and report back here. http://tomcat.10.n6.nabble.com/Tomcat-suddenly-dies-td4518543.html --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
