It won't really - it will just keep the JVM from wasting time resizing the heap on you. Since you know you need so much RAM anyway, no reason not to just pin it at what you need. Not going to help you much with GC though.
Jonathan Ariel wrote: > BTW why making them equal will lower the frequency of GC? > > On 9/25/09, Fuad Efendi <f...@efendi.ca> wrote: > >>> Bigger heaps lead to bigger GC pauses in general. >>> >> Opposite viewpoint: >> 1sec GC happening once an hour is MUCH BETTER than 30ms GC once-per-second. >> >> To lower frequency of GC: -Xms4096m -Xmx4096m (make it equal!) >> >> Use -server option. >> >> -server option of JVM is 'native CPU code', I remember WebLogic 7 console >> with SUN JVM 1.3 not showing any GC (just horizontal line). >> >> -Fuad >> http://www.linkedin.com/in/liferay >> >> >> >> >> -- - Mark http://www.lucidimagination.com
