linux-kernel - Re: [RFC][PATCH 00/26] sched/numa

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Message-ID: <CA+55aFwa-81x2Dysk8WS8ez2WkYSbaQDyQvpH0qE7fGJgxTbUQ@mail.gmail.com>
Date:	Mon, 19 Mar 2012 17:05:33 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Christoph Lameter <cl@...ux.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Avi Kivity <avi@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 00/26] sched/numa

On Mon, Mar 19, 2012 at 1:28 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> That having said PeterZ's numbers showed some pretty good
> improvement for the streams workload:
>
>  before: 512.8M
>  after: 615.7M
>
> i.e. a +20% improvement on a not very heavily NUMA box.

Well, streams really isn't a very interesting benchmark. It's the
traditional single-threaded cpu-only thing that just accesses things
linearly, and I'm not convinced the numbers should be taken to mean
anything at all.

The HPC people want to multi-thread things these days, and "cpu/memory
affinity" is a lot less clear then.

So I can easily imagine that the performance improvement is real, but
I really don't think "streams improves by X %" is all that
interesting. Are there any more relevant loads that actually matter to
people that we could show improvement on?

                     Linus
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