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SubjectRe: Severe VM problem on stock RH7.2 while running Java
On Fri, 11 Jan 2002, Dimitrie Paun wrote:

> It looks like the system spends 100% of it's time
> in the kernel, doing some VM-related thing.

> In this particular case the OOM killer managed to
> finally kill the offending java process, and the
> system recovered:

OK, so kernel 2.4.7-13 has a VM bug when running OOM. There are
two possible approaches to getting rid of this bug:

1) upgrade to a kernel which runs ok when pushed near OOM,
like 2.4.17 with my -rmap patch ... but if you do run
OOM with the newer kernel (a bit harder with 2.4.8 and
newer) your JVM will still be killed

2) add more swap or ram to the machine, so you have space
for the program you're trying to run

> Jan 9 21:29:59 vangogh kernel: Out of Memory: Killed process 6307 (java).

> procs memory swap io system
> cpu
> r b w swpd free buff cache si so bi bo in cs us sy
> id
> 0 2 1 484720 2048 612 8132 2348 6076 2356 6144 316 1174 16
> 4 80
> 7 0 1 530088 2824 524 6420 568 13354 598 13366 510 1007 6
> 9 85
> 1 1 1 530100 1804 548 6352 426 7682 686 7754 268 1622 24 27
> 50
> 0 2 1 523096 2356 564 6952 662 8984 1030 8984 297 586 2 15
> 82
> 1 2 3 514984 2616 580 6844 246 8388 246 8402 414 417 3 11
> 86

As you can see, you're really running OOM here, with very
little memory available for cache or buffers. You probably
want to add more swap space and/or ram in order to get
performance.

regards,

Rik
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