Hi Doug, The requirements of this application were as mentioned in the previous mail. Can I have any work around on the issue? What things you tried when you had same situation?
Regards, Sumit Gaikaiwari -----Original Message----- From: PTS [mailto:[EMAIL PROTECTED] Sent: Thursday, June 14, 2007 9:23 AM To: Tomcat Users List Subject: Re: Tomcat Server CPU utilization goes upto 400% Sumit, Look at the design of the app. Is each session doing a query every 30 seconds? Also is the database on the same server? I had an app that was originally designed to be for a few users that each session hit the database. Due to the amount of processing of the data it had a snowball effect that after more than a few users connected the system began to fall behind and the system came to a crawl. Since my query was the same for all users, I was able to spawn a thread to do a query every few minutes and cache the results, then each session grabbed a copy of the cached data from memory. I would also have to agree that it appears to be an application issue, especially after experiencing it myself. Or more accurately doing it to myself. Doug ----- Original Message ----- From: "Sumit Gaikaiwari" <[EMAIL PROTECTED]> To: "Tomcat Users List" <users@tomcat.apache.org> Sent: Wednesday, June 13, 2007 11:17 PM Subject: RE: Tomcat Server CPU utilization goes upto 400% 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. *** " > > ************************************************************************ *- -- -Andre- People see things the way they are and say "why ?" 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