Re: [Condor-users] java machines with > 2gb

[David Brodbeck <brodbd@xxxxxxxxxxxxxxxx>]

On Sep 12, 2008, at 8:26 AM, Matthew Farrellee wrote:

> A quick read of the work around[1], a few runs of java -Xmx...  
> NOTHING,
> and it seems this isn't entirely Condor's fault.
>
> $ java -Xmx4g NOTHING
> Invalid maximum heap size: -Xmx4g
> The specified size exceeds the maximum representable size.
> Error: Could not create the Java Virtual Machine.
> Error: A fatal exception has occurred. Program will exit.
>
> vs
>
> $ java -Xmx1g NOTHING
> Exception in thread "main" java.lang.NoClassDefFoundError: NOTHING
> ...
>
> On my 32 bit system, the JVM is not able to handle the 4GB max heap  
> size
> I've requested, but it can handle 1GB.

The maximum heap size for Java is slightly under 2 GB for 32-bit VMs  
and slightly under 4 GB for 64-bit VMs.  The exact limit depends on  
the OS and a few other factors, so you may have to experiment to find  
the largest "safe" value.

--

David Brodbeck
System Administrator, Linguistics
University of Washington