Do as Tim Funk suggested, issue a kill -3 to tomcat when CPU usage gets high to get an idea of what java Threads are currently doing. Issue a few kills to get a better view of what part of process takes times. If it's not enough to find the location of issue, you might want to invest time in using a profiler to locate problem (attach profiler to running jvm when it starts to consume CPU).
En l'instant précis du 14/06/07 05:17, Sumit Gaikaiwari s'exprimait en ces termes: > > There is an application deployed that refreshes after every 30 seconds. > After every 30 seconds, it requeries database and fetches the data. This > was a design requirement for this application. Generally large numbers > of sessions of this application are running (450-500). > > Regards, > Sumit Gaikaiwari > > > -----Original Message----- > From: Andre Prasetya [mailto:[EMAIL PROTECTED] > Sent: Wednesday, June 13, 2007 4:22 PM > To: Tomcat Users List > Subject: Re: Tomcat Server CPU utilization goes upto 400% > > i think its more to application problem instead of tomcat problem. Is > there > any application hosted inside tomcat that get infinite loop or use a > kind of > loop checking something that utilize the thread fully ? try solving that > with the application developer > > On 6/13/07, Sumit Gaikaiwari <[EMAIL PROTECTED]> wrote: > >> Hello, >> >> >> >> We are using tomcat 5.0.25 on Red Hat Enterprise Linux server. There >> > two > >> applications in webapps. We are facing an issue from around 3-4 months >> where the CPU utilization by java process (tomcat) goes quite high: >> around 400% in every 4-5 days. The application gets very slow and >> > tomcat > >> needs to be restarted for normal operation. The output of top command >> > is > >> as below- >> >> >> >> [EMAIL PROTECTED] jakarta-tomcat-5.0.25]# top >> >> Tasks: 78 total, 1 running, 77 sleeping, 0 stopped, 0 zombie >> >> Cpu(s): 25.1% us, 0.1% sy, 0.0% ni, 74.5% id, 0.2% wa, 0.0% hi, >> 0.0% si >> >> Mem: 4086472k total, 2487676k used, 1598796k free, 217464k >> > buffers > >> Swap: 6094824k total, 0k used, 6094824k free, 1811576k >> > cached > >> >> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND >> >> 1038 root 16 0 545m 244m 61m S 101 6.1 1156:22 java >> >> 1 root 16 0 2556 552 472 S 0 0.0 0:01.17 init >> >> 2 root RT 0 0 0 0 S 0 0.0 0:00.31 >> > migration/0 > >> >> >> >> Here is the status of active threads- >> >> Thread Status- >> >> >> >> [EMAIL PROTECTED] jakarta-tomcat-5.0.25]# ps -Le -o >> pid,user,s,lwp,pcpu,args | awk '$3 != "S" { print }' >> >> 1038 root R 1093 19.8 /usr/local/j2sdk1.4.2_12/bin/java -Xmx256m >> -Xms128m -Djava.awt.headless=true -Dsun.awt.font.advancecache=off >> -Djava.endorsed.dirs=/usr/local/jakarta-tomcat-5.0.25/common/endorsed >> -classpath >> >> > /usr/local/j2sdk1.4.2_12/lib/tools.jar:/usr/local/jakarta-tomcat-5.0.25/ > > bin/bootstrap.jar:/usr/local/jakarta-tomcat-5.0.25/bin/commons-logging-a > >> pi.jar -Dcatalina.base=/usr/local/jakarta-tomcat-5.0.25 >> -Dcatalina.home=/usr/local/jakarta-tomcat-5.0.25 >> -Djava.io.tmpdir=/usr/local/jakarta-tomcat-5.0.25/temp >> org.apache.catalina.startup.Bootstrap start >> >> 20544 root R 20544 0.0 ps -Le -o pid,user,s,lwp,pcpu,args >> >> >> >> This was status at certain instant of time. After 5 hours from this >> instant, the utilization reached to 400% and also there were many >> threads which were using almost 150% of CPU time. >> >> >> >> The system configuration is - >> >> >> >> [EMAIL PROTECTED] ~]# wget --quiet -O - --user admin --password nimda >> http://localhost:8080/manager/serverinfo >> >> OK - Server info >> >> Tomcat Version: Apache Tomcat/5.0.25 >> >> OS Name: Linux >> >> OS Version: 2.6.9-42.0.2.ELsmp >> >> OS Architecture: i386 >> >> JVM Version: 1.4.2_12-b03 >> >> JVM Vendor: Sun Microsystems Inc. >> >> >> >> Please can any one tell me possible cause for this issue? This issue >> > has > >> become very critical and needs to be fixed out soon. >> >> >> >> Regards, >> >> Sumit Gaikaiwari >> >> >> >> -**************Nihilent*************** >> >> " *** All information contained in this communication is confidential, >> proprietary, privileged and is intended for the addressees only. If >> > you have > >> received this E-mail in error please notify mail administrator by >> > telephone > >> on +91-20-39846100 or E-mail the sender by replying to this message, >> > and > >> then delete this E-mail and other copies of it from your computer >> > system. > >> Any unauthorized dissemination, publication, transfer or use of the >> > contents > >> of this communication, with or without modifications is punishable >> > under the > >> relevant law. >> >> Nihilent has scanned this mail with current virus checking >> > technologies. > >> However, Nihilent makes no representations or warranties to the effect >> > that > >> this communication is virus-free. >> >> Nihilent reserves the right to monitor all E-mail communications >> through its Corporate Network. *** " >> >> >> > ************************************************************************ > *- > > > > > --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
