On 21/06/2010 06:50, Hae Loong Chan wrote: > Hi, > > I have the memory issue/performance with the following situation: > > a. The machine installed with Solaris 10, with memory 2GB and swap space 4GB. > b. Running Tomcat 5.5.26 with one application at Xmx1024m and -Xmx256m > using JDK1.5.0_22. > c. 10 standalone clients are sending the web service request to > application for processing the task using xmlrpc.jar continuously. > d. The script is used to get the system properties, e.g. java.home, > java.class.path, os.name, etc and then construct the http response > send back the client. > e. After 1 week plus, the web users require very long time to login > and somehow the page cannot be displayed. > > I have done the following to monitor the issue: > a. Monitor the rss, vsz using ps -eo command, found that the rss and > vsz were increased slightly over time, until hitting 1.70G where the > web users experience slow performance on the page navigation in the > tomcat.
Take a thread dump and see what each of the threads are doing when this occurs. > b. I ran the Tomcat by putting the -verbose:gc -XX:+PrintGCDetails > -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC, then analyzed that the gc > heap over time is constant. What is constant? The size of the heap, or is GC running constantly? > c. Use jconsole to record the heap and non-heap usage, triggerring > Full GC, observed that the heap is reset to zero and the non-heap > won't drop. Non-heap memory usage is increased over time. > > d. Don't know the reason why cannot get the Tomcat runs into > OutOfMemory, the Tomcat shutdown itself without anything even the > argument "-XX:+HeapDumpOnOutOfMemoryError" is applied. What's the last thing in the logs? Are you using any native components? p > Did I missed out anything to track down the issue? Anyone, please > suggest and correct me. > > Thanks. > > Regards, > Chan. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org >
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