Howdy, Don't blindly increase the max memory: figure out how much your application SHOULD need in order to handle the expected maximum load with an acceptable response time. Set your app to that number and load-test it. Repeat until you arrive at the true max memory needed for your app. It may be more than 500MB or much less.
And do not blindly set -Xms=-Xmx, that's old advice that some people take as a rule of thumb. Allocation costs on JDK 1.4 and later are cheap. Yoav Shapira Millennium ChemInformatics >-----Original Message----- >From: David Rees [mailto:[EMAIL PROTECTED] >Sent: Saturday, December 13, 2003 5:52 PM >To: Tomcat Users List >Subject: Re: setting opts to avoid OutOfMemory errors > >Hans Steinraht wrote: > >> Maybe someone can help me out with some questions I have to avoid the >> OutOfMemory errors that I have from time to time >> >> The computer where Tomcat, version 4.1.24, is running is a linux machine >> wit 500M memory >> and j2sdk1.4.1. >> >> I have read in this newsgroup that the solutions to avoid OutOfMemory >> errors is to set the >> initial size of the memory allocation pool Xms to a value and also the >> max size Xmx. >> >> In this I have to questions: >> 1. what are the best values? >> 2. happends when I set the values to high? >> >> I have tried running tomcat with JAVA_OPTS="-Xms64m -Xmx256m", but the >> problem still occurs, so can I set Xmx to 500m, but what is than >happening >> with the memory left (maybe there isn't) for tha other applications on >thie >> machine. > >All increasing the -Xmx256M setting will do is delay the onset of the >OOM condition, it won't fix it. If you compile a lot of JSPs, make sure >that in the container's web.xml you set the fork attribute of the >JspServlet to true or use jikes, otherwise that will leak memory as well. > >With a machine that has 500M, I wouldn't use more than 256M for Tomcat >unless nothing else is running on it. > >-Dave > >--------------------------------------------------------------------- >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]
