On Wed, Feb 2, 2011 at 5:19 PM, Brett Delle Grazie <brett.dellegra...@gmail.com> wrote: > Hi Jan, > > On 2 February 2011 06:41, Olaf Tomczak <olaf.tomc...@gmail.com> wrote: >> Jan, >> >> The limit of open files on linux/unix systems for normal users may be >> quite low by default (for example 1024). From my experience, this may >> lead to "Too many open files" errors during high load even if your >> application is working fine. Try increasing this limit, also check >> your application as Chuck suggested. > > Just in case you aren't sure of how to do this on RHEL5 edit: > /etc/security/limits.conf > > You'll want to add a line similar to (assuming 'tomcat' is the user > running tomcat): > tomcat hard nofile 4096 > tomcat soft nofile 4096 > > Adjust the number (4096) as necessary. > >> >> -- >> Olaf >> >> 2011/2/2 jan gestre <ipcopper...@gmail.com>: >>> On Wed, Feb 2, 2011 at 6:26 AM, Caldarale, Charles R >>> <chuck.caldar...@unisys.com> wrote: >>>>> From: jan gestre [mailto:ipcopper...@gmail.com] >>>>> Subject: Re: Optimize CPU Hogging Tomcat 6 >>>> >>>>> Here's a snippet of the thread dump using jstack: >>>> >>>> Nothing there of any interest; all the ones you showed weren't running and >>>> were therefore not contributing to the CPU usage. >>>> >>>>> Also, here's my catalina log: >>>> >>>>> Feb 1, 2011 10:19:04 PM org.apache.tomcat.util.net.JIoEndpoint$Acceptor >>>>> run >>>>> SEVERE: Socket accept failed >>>>> java.net.SocketException: Too many open files >>>> >>>> That looks like something you should take care of... >>>> >>>> Is your webapp opening files (or sockets) and failing to close them? >>>> Running out of fd numbers will normally be fatal, and is almost always due >>>> to bugs in a webapp. >>>> >>>> What's your exact Tomcat version, JDK/JRE level, and platform? >>>> >>> >>> hi chuck, >>> >>> Tomcat's version is 6.0.29, Sun Java JDK 1.6.0_21 and RHEL5, webapp is >>> Alfresco. >>> >>> Regards, >>> >>> Jan >>> > > > > --
Hi Olaf and Brett, I already made those changes similar to what is mentioned here --> http://spiralbound.net/blog/2008/03/17/rhel-system-configuration-changes-for-oracle-10g, it appears that the changes improved the performance, the system no longer chokes. However I still want to optimize other settings like JVM configuration to further enhance systems performance, unfortunately I have where to find the JVM config. Cheers! Jan --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
