From: Ingo Molnar <mingo@elte.hu>
To: Daniel Lowengrub <lowdanie@gmail.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.6.28 1/2] memory: improve find_vma
Date: Thu, 5 Feb 2009 20:41:25 +0100 [thread overview]
Message-ID: <20090205194125.GA3129@elte.hu> (raw)
In-Reply-To: <8c5a844a0902050326v2155dbeaq5449f1e373f4245d@mail.gmail.com>
* Daniel Lowengrub <lowdanie@gmail.com> wrote:
> On Sun, Feb 1, 2009 at 3:00 PM, Ingo Molnar <mingo@elte.hu> wrote:
> >
> > you should time it:
> >
> > time ./mmap-perf
> >
> > and compare the before/after results.
> >
> > Ingo
> >
>
> I made a script that runs 'time ./mmap-perf' 100 times and outputs the
> average. The output on the standard kernel was:
>
> real: 1.022600
> user: 0.135900
> system: 0.852600
>
> The output after the patch was:
>
> real: 0.815400
> user: 0.113200
> system: 0.622200
>
> These results were consistent which isn't surprising considering the
> fact that they themselves are averages.
> What do you think?
Those nymbers look very convincing to me, a cool 25.4% speedup!
mmap-perf is very MM intense - including vma lookup.
Ingo
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next prev parent reply other threads:[~2009-02-05 19:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <8c5a844a0901220851g1c21169al4452825564487b9a@mail.gmail.com>
2009-01-22 17:22 ` [PATCH 2.6.28 1/2] memory: improve find_vma Hugh Dickins
2009-01-22 23:00 ` Daniel Lowengrub
2009-01-22 23:13 ` Ingo Molnar
2009-01-23 11:10 ` Daniel Lowengrub
2009-01-28 21:31 ` Daniel Lowengrub
2009-01-29 14:19 ` Ingo Molnar
2009-02-01 11:19 ` Daniel Lowengrub
2009-02-01 13:00 ` Ingo Molnar
2009-02-05 11:26 ` Daniel Lowengrub
2009-02-05 19:41 ` Ingo Molnar [this message]
2009-02-05 19:51 ` Peter Zijlstra
2009-01-17 17:12 Daniel Lowengrub
2009-01-18 22:36 ` KOSAKI Motohiro
2009-01-20 16:26 ` Daniel Lowengrub
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