Alex Turner wrote:

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.


The 1.4.x JVM's will also work just fine with much more than 1GB of memory. Perhaps you'd like to try again?

-- Alan


On 10/11/05, *Alan Stange* <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> 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




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