From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753225AbeBLRxA (ORCPT ); Mon, 12 Feb 2018 12:53:00 -0500 Received: from outbound-smtp17.blacknight.com ([46.22.139.234]:44277 "EHLO outbound-smtp17.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751109AbeBLRw7 (ORCPT ); Mon, 12 Feb 2018 12:52:59 -0500 Date: Mon, 12 Feb 2018 17:52:57 +0000 From: Mel Gorman To: Peter Zijlstra Cc: Mike Galbraith , Matt Fleming , LKML Subject: Re: [PATCH 2/2] sched/numa: Delay retrying placement for automatic NUMA balance after wake_affine Message-ID: <20180212175257.k4s2ytuxw4asqm2f@techsingularity.net> References: <20180212171131.26139-1-mgorman@techsingularity.net> <20180212171131.26139-3-mgorman@techsingularity.net> <20180212173449.GA25201@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20180212173449.GA25201@hirez.programming.kicks-ass.net> User-Agent: NeoMutt/20170912 (1.9.0) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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