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SubjectRe: dead mem pages -> dead machines

On Tue, 10 Jul 2001, Dirk Wetter wrote:

> On Tue, 10 Jul 2001, Mark Hahn wrote:
> > my point, perhaps to terse, was that you shouldn't run 4.3G of job on
> > a 4G machine, and expect everything to necessarily work.
> then i expect to have 300M+ swapped out and not 2.6GB. so what?
> > > > they should all have the same priority, so swapping is distributed.
> > > > currently sda5 fills (and judging by the 5, it's not on the fast
> > > > part of the disk) before sdb1 is used.
> > >
> > > well, that's the symptom, but not the disease, medically speaking.
> >
> > no, it's actually orthogonal, mathematically speaking:
> > your swap configuration is inefficient
> i am complaining about the fact that the machines start paging
> heavily without a reason and you are telling me that my swap
> config is wrong?
> > note also that swap listed as in use is really just allocated,
> > not necessarily used. the current VM preemptively assigns idle pages
> > to swapcache; whether they ever get written out is another matter.
> it IS used. after submitting the jobs the nodes were dead for a while since
> they were swapping like hell.
> > you should clearly run "vmstat 1" to see whether there's significant
> > si/so. it would be a symptom if there was actually a lot of *both*
> > si and so (thrashing).
> they were so dead, i couldn't even type on the console. load was up
> to 30, culprit at that point was kswapd.


Can you boot the kernel with "profile=2" and use the "readprofile" tool to
check where the kernel is wasting its time ? (take a look at the
readprofile man page)

Let me machine stay in the "unusable" state for quite some time before
reading the statistics.

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