users@glassfish.java.net

Re: Several Dropouts per Day

From: Alexis Moussine-Pouchkine <alexis.mp_at_sun.com>
Date: Fri, 20 Feb 2009 12:57:00 +0100

On Feb 20, 2009, at 12:22, glassfish_at_javadesktop.org wrote:

>> Sounds like garbage collection.
>
> What does this mean.
> JDK Problem or is there something i could do?

Maybe some JVM tuning...

>> Is the 64-bit VM necessary?
>
> Not so fimular with admin stuff.
> In 2007 the server has been installed.
> OS, MySQL 64bit and therefor Java has also been taken 64bit.
>
> Neccessary, i think currently not, its just a small server with 2GB
> RAM.
> But if the Memory must be increased in the future, i think the 64bit
> is neccessary or?

You can run 32-bit JVMs on 64-bit OS.
If you don't have the need to address more than 2GB (or 4GB) of heap
space (you probably have a -Xmx setting somewhere), then 32-bit JVM
will do and *may* cause less GC issues.

If GC is still an issue you'll need to get some GC activity data (say,
using visualvm).
Maybe you could share your JVM options (use jinfo against a running GF)

-Alexis


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