Hi, It might be a big full garbage collection. Add -verbose:gc to your startup JVM options. Use the system normally, and check the console log as soon as you have one of those 20-second pauses. If it says something like [Full GC: XXXXXXX -> YYYYYYY (20 sec)] then that's the culprit. You will need to tune your GC parameters for this high a load anyways.
Yoav Shapira Millennium Research Informatics >-----Original Message----- >From: Wojciech Sobczuk [mailto:[EMAIL PROTECTED] >Sent: Thursday, May 13, 2004 6:03 AM >To: [EMAIL PROTECTED] >Subject: Tomcat having strange 'hickups' > >Hello, > >I'm running Tomcat 5.0.18 on RedHat 9, started with the following >commandline: >/usr/java/j2sdk1.4.2_01//bin/java -Xmx256m -server >-Djava.endorsed.dirs=/usr/java/jakarta-tomcat/common/endorsed -classpath >/usr/java/j2sdk1.4.2_01//lib/tools.jar:/usr/java/jakarta- >tomcat/bin/bootstrap.jar:/usr/java/jakarta-tomcat/bin/commons-logging- >api.jar >-Dcatalina.base=/usr/java/jakarta-tomcat >-Dcatalina.home=/usr/java/jakarta-tomcat >-Djava.io.tmpdir=/usr/java/jakarta-tomcat/temp >org.apache.catalina.startup.Bootstrap start > >and with development=false and fork=true in the jsp servlet configuration. > >This installation is serving around 200000 hits per day, much of it is >DB intensive. Before i set development=false and fork=true I had big >hangups when I changed the JSPs and Tomcat started recompiling them - >the whole engine practically stopped for a few minutes and the load went >up to 16 on the server. Now development and fork variables are set >correctly for deployment, but I am still having a strange problem. >Every now and then (probably every few hours, I can't tell exactly) >Tomcat stops for around 20 seconds. I noticed it when browsing one of >my sites, everything was working fast, and then at a certain point, >after I clicked on a link, the browser started connecting to the server >and waited for the response for a long time. When I checked the load on >the box it was 1-2 (normally it's 0.5), but didn't notice any processes >hogging the CPU with 'top'. I already fixed all DB connection leaks I >had so that can't be the issue here. Traffic peaks can't be it either, >I have constant traffic. > >I know that this isn't a precise description of the error I'm >encountering but I don't have any more information at this point. I'm >hoping that someone encountered this already and can help me, or perhaps >you can give me directions how to figure out what's wrong. > >Best regards, >W. Sobczuk > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
