OpenJDK not ready for virtualized environments

[Andrew Haley]

On 07/03/2010 05:56 AM, Jaroslav Tulach wrote:
> My message to gmane.comp.java.openjdk.distro-packaging.devel never appeared. 
> Trying email as a last resort...
> 
> Subject: OpenJDK not ready for virtualized environments
> By: Jaroslav Tulach <jaroslav.tulach at sun.com>
> Date: Mon, 14 Jun 2010 18:07:25 +0200
> 
> Hello guys,
> I have troubles using OpenJDK under mine VirtualBox. See:
> http://wiki.apidesign.org/wiki/Virtualization#Too_Big_Initial_Limit
> 
> After a discussion at #openjdk it looks like like a result of changing the 
> defaults in amount of heap size and perm gen size. I believe the change is 
> wrong. It shall rather check the # of available memory and if lower than 1GB 
> stick with old defaults.

The heap and stack sizes are really only a guess, and on most GNU/Linux
environments won't cause any problem.  All that asking for a large heap
will do is pre-allocate the address space in the page tables: it doesn't
use the memory until it's actually needed.

I'm wondering if there's something odd about the vm.overcommit_memory
setting in the system you're been using.

Andrew.