Ooops, I meant -Xmx512 ;) > -----Original Message----- > From: Quinten Verheyen > Sent: 20 April 2005 15:32 > To: 'Tomcat Users List' > Subject: RE: Heap not expanding beyond -Xms512m > > > 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] > > > > >
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