OpenJDK and boxes with lots of RAM
fweimer at bfk.de
Fri Nov 18 00:09:28 PST 2011
* Jan Just Keijser:
> I would like to report an issue with OpenJDK 1.6 (and Oracle Java 6u29)
> that we have run into on our grid computing farm:
The same topic has recently been discussed on the hotstop-dev list.
> the latest&greatest worker nodes have 12 cores and 48 GB of RAM ; we
> offer a maximum 12 jobs slots on these worker nodes, in order to
> accomodate small and large jobs (users can requests 1 - 12 cores). To
> ensure that the different jobs don't interfere with each other we also
> set a VMEM limit for each job slot. The current VMEM limit is 48 / 12 =
> 4 GB RAM per job slot. Each single core job that starts has a 'ulimit
> -v' of 4,000,000 .
Hmm. Does this mean that Hotspot should call getrlimit(RLIMIT_AS) and
limit itself to some fraction of that value if it is not unlimited?
Florian Weimer <fweimer at bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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