Re: Performance on SUSE w/ reiserfs

Perhaps this is true for 1.5 on x86-32 (I've only used it on x86-64) but I
was more thinking 1.4 which many folks are still using.

Alex

On 10/11/05, Alan Stange <stange(at)rentec(dot)com> wrote:
>
> Alex Turner wrote:
>
> > Realise also that unless you are running the 1.5 x86-64 build, java
> > will not use more than 1Gig, and if the app server requests more than
> > 1gig, Java will die (I've been there) with an out of memory error,
> > even though there is plenty of free mem available. This can easily be
> > cause by a lazy GC thread if the applicaiton is running high on CPU
> usage.
>
> On my side of Planet Earth, the standard non-x64 1.5 JVM will happily
> use more than 1G of memory (on linux and Solaris, can't speak for
> Windows). If you're running larger programs, it's probably a good idea
> to use the -server compiler in the JVM as well. I regularly run with
> -Xmx1800m and regularly have >1GB heap sizes.
>
> The standard GC will not cause on OOM error if space remains for the
> requested object. The GC thread blocks all other threads during its
> activity, whatever else is happening on the machine. The
> newer/experimental GC's did have some potential race conditions, but I
> believe those have been resolved in the 1.5 JVMs.
>
> Finally, note that the latest _05 release of the 1.5 JVM also now
> supports large page sizes on Linux and Windows:
> -XX:+UseLargePages this can be quite beneficial depending on the
> memory patterns in your programs.
>
> -- Alan
>