Paul Menage Messages: 642 Registered: September 2006
Senior Member
On 9/20/06, Paul Jackson <pj@sgi.com> wrote:
> Chandra wrote:
> > AFAICS, That doesn't help me in over committing resources.
>
> I agree - I don't think cpusets plus fake numa ... handles over commit.
> You might could hack up a cheap substitute, but it wouldn't do the job.
I have some patches locally that basically let you give out a small
set of nodes initially to a cpuset, and if memory pressure in
try_to_free_pages() passes a specified threshold, automatically
allocate one of the parent cpuset's unused memory nodes to the child
cpuset, up to specified limit. It's a bit ugly, but lets you trade of
performance vs memory footprint on a per-job basis (when combined with
fake numa to give lots of small nodes).
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