> From: Tomcat Novice [mailto:tomcat.nov...@gmail.com] > Subject: Tomcat Thread utilization growing very large causing a hung > tomcat instance > > I have been encountering issues where a particular tomcat > instance/s are having large thread count during load testing > and results in a hung state.
I suspect that your code is spawning threads, and not managing them properly. Your horribly formatted stack trace shows timer threads being started by: at com.hp.ov.sm.client.common.communications.HeartBeat.(HeartBeat.java:68) at com.hp.ov.sm.client.common.communications.SOAPClient.connect(SOAPClient.java:237) at com.hp.ov.sm.client.webtier.WebClient.connect(WebClient.java:95) at com.hp.ov.sm.client.webtier.WebController.init(WebController.java:599) at com.hp.ov.sm.client.webtier.WebControllerServlet.index(WebControllerServlet.java:448) at com.hp.ov.sm.client.webtier.WebControllerServlet.process(WebControllerServlet.java:366) at com.hp.ov.sm.client.webtier.WebControllerServlet.processHTTPRequest(WebControllerServlet.java:317) at com.hp.ov.sm.client.webtier.WebControllerServlet.doGet(WebControllerServlet.java:255) (The next time, leave the line breaks in the trace, please.) > 1. Any ideas how I can resolve/isolate this problem? Fix your webapp to manage threads properly. > 2. I know I need to do a thread dump but I am not familiar on how to > analyze thread dumps from Tomcat. Can you point me to documententation > on how I can analyze thread dumps from Tomcat? Take a thread dump on a Tomcat that's been used but now idle, and then one on the problematic system, and compare. > 3. Also, can someone confirm if the thread dumps from JDK 1.5 are the > same as the Thread Dumps from a JDK 1.6? I seem to be getting different > formats. Can someone just confirm? I don't recall any major differences, but they are unlikely to be identical, since minor enhancements to the JVM are made all the time. > 4. If the maxThread is set to 200, why are the Tomcat instances > utilizing up to 400 Threads (see screenshot) There isn't a screenshot (the mailing list strips most attachments). Post data, not pictures. Also post your server.xml so we can see what you have configured, but please remove the commented-out bits (and passwords) before doing so. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
