Quinten, Matt, Thank you for your feedback and the JVM reference.
Guillaume ----- Original Message ----- From: "Quinten Verheyen" <[EMAIL PROTECTED]> To: "Tomcat Users List" <tomcat-user@jakarta.apache.org> Subject: RE: Heap not expanding beyond -Xms512m Date: Wed, 20 Apr 2005 15:32:12 +0200 > > I agree, it's always a good idea to let the JVM do what it is supposed to do > instead of creating a growing overhead. The only exception to that rule is if > you think you'll reach 1024 MB, but as you say yourself, 512 seems to do fine > as -Xms. > > btw, here is an article that goes into detail (ratio's etc.) using jvm 1.4.2 > http://java.sun.com/docs/hotspot/gc1.4.2/index.html > > Q > > > -----Original Message----- > > From: Dale, Matt [mailto:[EMAIL PROTECTED] > > Sent: 20 April 2005 15:24 > > To: Tomcat Users List > > Subject: RE: Heap not expanding beyond -Xms512m > > > > > > > > This is expected behaviour. The heap will not grow if the memory required > > can be gained through a garbage collection. The heap will only grow if > > after > > a garbage collection it still cannot allocate the required memory or is > > over > > a certain percentage (I forget what the default is). > > > > I would suggest that you don't in fact need 512MB if your app runs fine > > with > > no OOM in 512MB. > > > > If you really want to use the full 1GB the you'll have to use -Xms as you > > suggested. > > > > Ta > > Matt > > > > -----Original Message----- > > From: Guillaume Lahitette [mailto:[EMAIL PROTECTED] > > Sent: 20 April 2005 13:54 > > To: tomcat-user@jakarta.apache.org > > Subject: Heap not expanding beyond -Xms512m > > > > > > Hello Tomcat-oids, > > > > I'd really appreciate any help with this...Thanks in advance. > > > > We've been running performance tests against Tomcat 4.1.26 on Linux and > > Windows. We've tuned heap sizes to -Xms512m -Xmx1024m. > > > > Monitoring the JVM memory usage with a daemon thread calling > > Runtime.getRuntime().freeMemory() / totalMemory() / maxMemory(), we've > > noticed memory was never expanded beyond 512MB. Instead, when usage was > > getting close to 512MB, we could see the garbage collector kick in. We > > never > > got OOM errors. > > > > Can anyone share experiences about this? Do I have to use -Xms1024m > > -Xmx1024m (which seems to defeat the purpose of having ms and mx...)? > > > > Guillaume > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
