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SubjectRe: [PATCH 2/2] sched/numa: Delay retrying placement for automatic NUMA balance after wake_affine
On Mon, Feb 12, 2018 at 06:34:49PM +0100, Peter Zijlstra wrote:
> On Mon, Feb 12, 2018 at 05:11:31PM +0000, Mel Gorman wrote:
>
> > However, the benefit in other cases is large. This is the result for NAS
> > with the D class sizing on a 4-socket machine
> >
> > 4.15.0 4.15.0
> > sdnuma-v1r23 delayretry-v1r23
> > Time cg.D 557.00 ( 0.00%) 431.82 ( 22.47%)
> > Time ep.D 77.83 ( 0.00%) 79.01 ( -1.52%)
> > Time is.D 26.46 ( 0.00%) 26.64 ( -0.68%)
> > Time lu.D 727.14 ( 0.00%) 597.94 ( 17.77%)
> > Time mg.D 191.35 ( 0.00%) 146.85 ( 23.26%)
>
> Last time I checked, we were some ~25% from OMP_PROC_BIND with NAS, this
> seems to close that hole significantly. Do you happen to have
> OMP_PROC_BIND numbers handy to see how far away we are from manual
> affinity?
>

OMP_PROC_BIND implies openmp and this particular test was using MPI for
parallisation. I'll look into doing an openmp comparison and see what it
looks like with OMP_PROC_BIND set.

--
Mel Gorman
SUSE Labs

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