Re: [Xen-users] Java JVM and memory on Xen

[Rob Shepherd <rs@xxxxxxxxxxxxx>]

Fajar A. Nugraha wrote:
> On Tue, Nov 10, 2009 at 8:52 PM, Rob Shepherd <rs@xxxxxxxxxxxxx> wrote:
>
>   
> > I finally tracked down the crash to that single 1MB adjustment of RAM.
> >
> > although the JVM is only configured to use 512MB of RAM MAX (-Xmx512m)
> >
> > This is very bizarre.  Has anybody seen behaviour before, or have any
> > comments about why it may be happening?
> >     
> Java uses MORE memory then what you set on -Xmx. For example, I set
> -Xmx512m on an app and "top" shows 693MB RES, 1392M VIRT.
>
> Perhaps you disable swap so that all VIRT needs to be on memory, thus
> oom-killer killed it?
>   
I though this earlier but no. 

swap total == swap free == 4194296 kB

One would expect an OOM Error to come through a JVM stacktrace. This is 
a JVM Segfault.
Nevertheless, thank you for your input.

I'd be glad of any further suggestions.

Kind regards

Rob


--
Rob Shepherd BEng PhD - Director / Senior Engineer - DataCymru Ltd



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