linux-kernel - Re: stat benchmark

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Date:	Mon, 28 Apr 2008 21:41:36 +0200
From:	Alexander Larsson <alexl@...hat.com>
To:	Carl Henrik Lunde <chlunde@...g.uio.no>
Cc:	Soeren Sandmann <sandmann@...mi.au.dk>,
	Theodore Tso <tytso@....edu>, linux-kernel@...r.kernel.org
Subject: Re: stat benchmark

On Mon, 2008-04-28 at 02:13 +0200, Carl Henrik Lunde wrote:
> On Mon, Apr 28, 2008 at 1:29 AM, Soeren Sandmann <sandmann@...mi.au.dk> wrote:
> [...]
> >  For a directory of ~2360 files, chunks of a 1000 files is actually
> >  surprisingly worse than statting all of the files at once:
> >
> >     Time to stat 1000 files: 1.008735 s
> >     Time to stat 1000 files: 0.738936 s
> >     Time to stat 366 files: 0.217002 s
> >
> >  I guess this just shows that seeks really is pretty much all that
> >  matters. Glib should maybe use a larger chunk size.
> 
> I agree, if I remember correctly I did not find a directory on my local
> disk where the best result was to sort a chunk instead of the complete
> directory.

I don't think that is expected either. The reason for the chunking is to
avoid unlimited memory use on large directories.

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