linux-kernel - Re: [LKP] [sched/numa] a43455a1d57: +94.1% proc-vmstat.numa_hint_faults

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Message-ID: <20140731173705.GC19379@twins.programming.kicks-ass.net>
Date:	Thu, 31 Jul 2014 19:37:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jirka Hladky <jhladky@...hat.com>
Cc:	Rik van Riel <riel@...hat.com>, Aaron Lu <aaron.lu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [LKP] [sched/numa] a43455a1d57: +94.1%
 proc-vmstat.numa_hint_faults_local

On Thu, Jul 31, 2014 at 06:39:05PM +0200, Jirka Hladky wrote:
> I'm doing 3 iterations (3 runs) to get some statistics. To speed up the test
> significantly please do the run with 20 warehouses only
> (or in general with #warehouses ==  number of nodes * number of PHYSICAL
> cores)

Yeah, went and did that for my 4 node machine, its got a ton more cores, but I
matches the warehouses to it:

-a43455a1d57	tip/master

979996.47	1144715.44
876146		1098499.07
1058974.18	1019499.38
1055951.59	1139405.22
970504.01	1099659.09

988314.45	1100355.64	(avg)
75059.546179565	50085.7473975167(stdev)

So for 5 runs, tip/master (which includes the offending patch) wins hands down.

Each run is 2 minutes.

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