Thank you very much Rainer. >Tomcat itself doesn't need much memory and you should be able to run it with >less than 64MB Heap (plus Perm) I recognized 64MB >= Am + Bm from your advice. Is my recognized correct ? ---example catalina.sh--- -XX:NewSize=Am -XX:MaxNewSize=Am -XX:PermSize=Bm -XX:MaxPermSize=Bm"
Regard, -- tknv/ On 31 August 2010 19:00, Rainer Jung <rainer.j...@kippdata.de> wrote: > On 31.08.2010 10:34, takanobu watanabe wrote: >> >> Hello, >> >> What is default value of CATALINA_OPTS at apache-tomcat-6.0.29 ? >> It means No configure catalina.sh as same as value of CATALINA_OPTS >> just expand tomcat. >> >> Because I try to run tomcat lean physical memory condition(128Mb only >> with armv5). >> When nothing configure to catalina.sh(default),Tomcat works well. >> But when I configure below,looks like always FullGC running and could >> not access WEB service. >> --- >> CATALINA_OPTS=" -verbose:gc -XX:+PrintGCTimeStamps -Xms64m -Xmx64m >> -XX:NewSize=32m -XX:MaxNewSize=32m >> -XX:SurvivorRatio=2 -XX:PermSize=16m -XX:MaxPermSize=16m" >> --- >> If anyone has idea or suggest of run tomcat on lean physical memory >> condition, I would like to know. > > If you don't add explicit memory options, the default memory sizes of your > JVM are used. Those might depend on the exact jvm version and also on the > type of system you run it on (total memory, CPUs). > > The easiest way to find out the sizes for your jvm are running it without > explicit settings and then measuring it. Measuring can be done with tools > like jstat, jconsole or jvisualvm, or you can add a few verbose gc flags to > print out the sizes of the different memory regions during each run of the > GC, e.g. > > -verbose:gc -XX:+PrintGCDetails -XX:+PrintHeapAtGC -XX:+PrintGCTimeStamps > > Note that the default settings will allow some of the regions to grow and > shrink, so you need to make observations for a longer time to find out the > values which are effective most of the time. > > I expect your above settings might not leave enough room in the Old > Generation (aka Tenured), because your New Generation is somwhat large > relative to the Old Gen. Tomcat itself doesn't need much memory and you > should be able to run it with less than 64MB Heap (plus Perm), but what you > need in the end depends on the application inside (and the concurrency > induced by the load). I never experimented to find a minimum value though. > > Regards, > > Rainer > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > -- please visit tknv.tk/ --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
