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
