Java Out of Heap Issue
Hi, I have a Apache-tomcat environment serving simple .jsp's. Issue - After few days of application been up, we see Java heap out of memory error. Steps taken: The Tomcat was configured to run with default heap size. Seeing Java Heap memory issue, i increased it and the setevn.sh file looks like - CATALINA_OPTS='-Xms256m -Xmx256m -XX:+HeapDumpOnOutOfMemoryError -Xloggc:/appl/gcdata/gcdata.txt -XX:+PrintGCDetails' Looking at Garbage Collection graph it is seen - 1 minor Collections spikes to around 1sec after few hrs in between. 2 The maximum and minimum heap size is configured as 256MB, but slowly in couple days, the total heap size reducing automatically and Full Collections becomes frequent to a extend that minor collections stop happening. JVM starts triggering only full collection. just a snapshot of jmap, [r...@saml-app lib]# jmap -heap 8130 Attaching to process ID 8130, please wait... Debugger attached successfully. Server compiler detected. JVM version is 1.5.0_18-b02 using thread-local object allocation. Parallel GC with 4 thread(s) Heap Configuration: MinHeapFreeRatio = 40 MaxHeapFreeRatio = 70 MaxHeapSize = 268435456 (256.0MB) NewSize = 2686976 (2.5625MB) MaxNewSize = -65536 (-0.0625MB) OldSize = 1835008 (1.75MB) NewRatio = 2 SurvivorRatio= 8 PermSize = 21757952 (20.75MB) MaxPermSize = 88080384 (84.0MB) Heap Usage: PS Young Generation Eden Space: capacity = 33947648 (32.375MB) used = 15199704 (14.495567321777344MB) free = 18747944 (17.879432678222656MB) 44.77395311745898% used From Space: capacity = 3276800 (3.125MB) used = 1835008 (1.75MB) free = 1441792 (1.375MB) 56.0% used To Space: capacity = 3735552 (3.5625MB) used = 0 (0.0MB) free = 3735552 (3.5625MB) 0.0% used PS Old Generation capacity = 178978816 (170.6875MB) used = 69737192 (66.5065689086914MB) free = 109241624 (104.1809310913086MB) 38.96393638004623% used PS Perm Generation capacity = 21757952 (20.75MB) used = 15172568 (14.469688415527344MB) free = 6585384 (6.280311584472656MB) 69.73343814711973% used JVM is 64bit. Once thing more, the application code is quite old and was running on Java 1.4. Any suggestions Kulbir
Re: Tuning worker MPM
hmm, np.. thanks On Tue, Mar 10, 2009 at 10:17 PM, Caldarale, Charles R chuck.caldar...@unisys.com wrote: From: kulbir Saini [mailto:kulbir.sai...@gmail.com] Subject: Re: Tuning worker MPM Firstly, let me convey my sorry been using this e-mail thread, i tried to put on httpd list but i think thread is breaking there. Apology not accepted. Please do not post httpd-specific questions to the Tomcat list. - 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
Re: Tuning worker MPM
i already got that update.. kulbir On Sun, Mar 8, 2009 at 1:39 PM, André Warnier a...@ice-sa.com wrote: kulbir Saini wrote: [...] You have just bought a Ford car, and you are calling the General Motors distributor about a problem with it. Even assuming there's still someone there to answer your call, they won't be able to help you. ;-) In other words, Kulbir Saini, you are posting to the wrong list. This list is for the Tomcat Java servlet server. Apache webserver (or httpd) related questions should go to the Apache httpd user list. See http://httpd.apache.org; for details. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
