Fully disable GC - no pauses - run with massive heap until outofmemory

Y. Srinivas Ramakrishna Y.S.Ramakrishna at Sun.COM
Wed Feb 3 16:03:52 PST 2010

On 02/03/10 15:58, Y. Srinivas Ramakrishna wrote:
> Hello Anthony --
> On 02/03/10 14:43, anthony.warden at nomura.com wrote:
>> How best to do this please?
>> Command line options / hack the gc thread etc.
> Shape the heap so as to give all (or most) of it to the young gen,
> use no survivor spaces. For example, say you want a 32 G heap.
> Let's give 4 M to the old gen may be. So you could do:-
>    -Xmn32g -Xmx(32*1024+4)m -Xms(32*1204+4)m -XX:SurvivorRatio=1g

i meant 1024 instead of 1204 above. Sorry for the typo.

-- ramki

> (of course you use the computed values of the expressions in parentheses above.)
> Unfortunately, this will not give you an OOM when the heap gets
> full. It'll trigger a scavenge. If you want to give up the ghost at
> the first scavenge you can (if you are running on Solaris for example)
> write a Dtrace script to detect the invocation of a GC and kill
> the JVM process. Don't know if that's the behaviour you seek here.
> -- ramki
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