Wolf-Dieter Fink [https://community.jboss.org/people/wdfink] created the discussion "Re: High CPU Utilization" To view the discussion, visit: https://community.jboss.org/message/734207#734207 -------------------------------------------------------------- What threads of the JBoss-Java process consume the CPU? Or is it during runtime (not the first call) and the GC is active? -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/734207#734207] Start a new discussion in Performance Tuning at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Usually I do the following: i. Check for full garbage collection events using ‘jstat –gcutil ‘ ii. Take several thread dumps 15 seconds apart - use Thread Dump Analyser to look for locked threads and also look for busy threads top –H –p pid From: jboss-user-bounces(a)lists.jboss.org [mailto:jboss-user-bounces@lists.jboss.org] On Behalf Of Amol Walanj Sent: 08 May 2012 10:03 To: User development Subject: [jboss-user] [Performance Tuning] - Re: High CPU Utilization JBoss Community<https://community.jboss.org/index.jspa> Re: High CPU Utilization created by Amol Walanj<https://community.jboss.org/people/walanj.amol> in Performance Tuning - View the full discussion<https://community.jboss.org/message/734226#734226> ________________________________ Hi , Thanks for quick reply. Its during the runtime when we fired the bulk orders. (Client with 20 threads) What I had observed from jconsole is , the tomcat threads (http-0.0.0.0-8080-*) are taking more time to complete. I had tried to find the top 5 threads consuming the CPU during this run using the shell script. The Partial O/P is as follows : PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 11935 sis 15 0 6342m 3.7g 11m S 29.5 47.0 0:10.37 java 11681 sis 15 0 6342m 3.7g 11m R 25.6 47.0 0:27.65 java 11662 sis 15 0 6342m 3.7g 11m S 23.6 47.0 0:31.89 java 11682 sis 15 0 6342m 3.7g 11m S 21.6 47.0 0:31.34 java 11663 sis 15 0 6342m 3.7g 11m S 21.6 47.0 0:33.84 java Pasting here the thread Dump for one of the PID.The others dump also shows the same dump. ========> Java LWP: 11681 - Native Thread ID=2da1 "http-0.0.0.0-8080-15" daemon prio=10 tid=0x00002aaac0877000 nid=0x2da1 waiting on condition [0x0000000042e7f000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x0000000746df1920> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178) at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262) at org.jboss.security.plugins.JBossAuthorizationManager.internalAuthorization(JBossAuthorizationManager.java:470) at org.jboss.security.plugins.JBossAuthorizationManager.authorize(JBossAuthorizationManager.java:125) at org.jboss.security.plugins.javaee.WebAuthorizationHelper.hasUserDataPermission(WebAuthorizationHelper.java:201) at org.jboss.web.tomcat.security.JBossWebRealm.hasUserDataPermission(JBossWebRealm.java:643) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:461) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:905) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:592) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:2036) at java.lang.Thread.run(Thread.java:662) Thanks, Amol Reply to this message by going to Community<https://community.jboss.org/message/734226#734226> Start a new discussion in Performance Tuning at Community<https://community.jboss.org/choose-container!input.jspa?cont... ________________________________ This e-mail from Practical Law Company (http://www.practicallaw.com) is subject to our terms of use (http://www.practicallaw.com/9-103-0884). Information about our companies: Practical Law Company Limited. Registered in England and Wales. Registered Number: 02889191. Registered Office: 19 Hatfields, London SE1 8DJ. Telephone: +44(0)20 7202 1200. Practical Law Company, Inc. Incorporated in Delaware, USA. Corporate Office: 747 Third Avenue, 36th Floor, New York, NY 10017. Telephone: +1(646) 562-3400.

Wolf-Dieter Fink [https://community.jboss.org/people/wdfink] created the discussion "Re: High CPU Utilization" To view the discussion, visit: https://community.jboss.org/message/734266#734266 -------------------------------------------------------------- I don't catch it, I suppose I did not understand your scenario. Do you deploy a WAR application and fire bulk operations with 20 threads parallel. The server has maxThreads=5 (8), which will put most of the client threads in a wait state. When do you reach the CPU utilization and what TPS mean? And what do you want to achieve? More througput or less CPU? -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/734266#734266] Start a new discussion in Performance Tuning at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Amol Walanj [https://community.jboss.org/people/walanj.amol] created the discussion "Re: High CPU Utilization" To view the discussion, visit: https://community.jboss.org/message/734396#734396 -------------------------------------------------------------- My goal is to gain high TPS with avg. response time below 25ms and low CPU Utilization. My client is a normal HttpClient written in Java. Using Thread Pool Executor I manged my client side threads. Peter , I didn't worked with Rajesh. The issue you mentioned also looks similar to mine. But here you mentioned by increasing the threads the more load on CPU. what I had found from my testing is there is 1-2 % increase when I increase almost 10 threads from the client. But the CPU is largely depend on the maxThreads of the http connector configuration in server.xml under deploy/jbossweb.sar directory. I had calculated the time taken to complete 1 Query. It's in the range of 5-15ms So What I can see that the max CPU is Utilized in Handling connections. So I want to optimize this connections handling so that to reduce CPU with high TPS. Thanks, Amol -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/734396#734396] Start a new discussion in Performance Tuning at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Amol Walanj [https://community.jboss.org/people/walanj.amol] created the discussion "Re: High CPU Utilization" To view the discussion, visit: https://community.jboss.org/message/737645#737645 -------------------------------------------------------------- Hi Peter , Thanks for reply I agreed with your comment. But our issue is we are getting high CPU for the minimal load itself. I am getting 78-82 % CPU with 12 threads and 80-85 % with 20 threads. And we supposed to have that much load (Concurrent users) in the production system. -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/737645#737645] Start a new discussion in Performance Tuning at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]