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From David Pollak <feeder.of.the.be...@gmail.com>
Subject Re: Memory usage -> stability probs?
Date Tue, 23 Jun 2009 13:15:55 GMT
Vassil & Erik -- lots of useful stuff in here... I wish I had know about
these options when I was debugging the Actors memory retention problems...
:-)

On Tue, Jun 23, 2009 at 4:36 AM, Erik Engbrecht <erik.engbrecht@gmail.com>wrote:

> -XX:+*HeapDumpOnOutOfMemoryError** **is also very useful for post-mortems.*
>
> On Tue, Jun 23, 2009 at 2:46 AM, Vassil Dichev <vdichev@apache.org> wrote:
>
> > > I added code that will dump memory information every 10 minutes.
>  Please
> > put
> > > the new code live.  If it barfs, please send me the output (privately
> is
> > > better so we don't spam the list with a 10MB file)
> > > I'm running an instance on my local box and will see if I can find
> memory
> > > leaks.
> >
> > This is cool, but I'm afraid we might need some extra info from the
> > JVM. I'm not sure you can change the command-line or environment you
> > use to start the application in Stax, but this should display detailed
> > information for the Sun JVM.
> >
> > MAVEN_OPTS=-verbose:gc -XX:+PrintGCDetails -XX:+PrintClassHistogram
> >
> > and for extra debugging, you can turn on the built in profiler with
> > the following options:
> >
> > -Xrunhprof:heap=sites,cpu=samples,doe=y
> >
> > It will make the JVM run even slower, but could really pinpoint where
> > the problem was.
> >
> > As for thread dumps, they're even more useful if you encounter the
> > 100% CPU issue, but we need to send a signal to the JVM, which I'm not
> > sure you can do at all in a managed stax environment. There are
> > solutions to trigger it programmatically, but you need to include a
> > native library, which is another restriction we might not be able to
> > overcome.
> >
> > All in all, it would be much better if we can reproduce it locally,
> > where we can play with the application. I assume you couldn't set
> > MAVEN_OPTS last time there was a problem, since there was no feedback.
> > Monitoring an app for memory problems in a restricted environment is
> > notoriously hard.
> >
> > Vassil
> >
>
>
>
> --
> http://erikengbrecht.blogspot.com/
>



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