Date: Fri, 28 Dec 2007 13:38:51 -0800 From: Alfred Perlstein <alfred@freebsd.org> To: Alexandre Biancalana <biancalana@gmail.com> Cc: freebsd-performance@freebsd.org Subject: Re: Bad performance when accessing a lot of small files Message-ID: <20071228213851.GE76698@elvis.mu.org> In-Reply-To: <8e10486b0712251647uddf80f9sa6cacb42dfa94ff5@mail.gmail.com> References: <8e10486b0712191109n3d21b02cyf5183ee0cd01d8ce@mail.gmail.com> <20071221201625.GZ16982@elvis.mu.org> <8e10486b0712211249v4c5571ddud21b277f686992b2@mail.gmail.com> <20071221212808.GE16982@elvis.mu.org> <8e10486b0712211555n3efe8729qff14387be128cf10@mail.gmail.com> <20071222002535.GL16982@elvis.mu.org> <8e10486b0712251647uddf80f9sa6cacb42dfa94ff5@mail.gmail.com>
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* Alexandre Biancalana <biancalana@gmail.com> [071225 16:45] wrote:
> On 12/21/07, Alfred Perlstein <alfred@freebsd.org> wrote:
>
> > Have you tried the 'noatime' mount option? That should help.
>
> Yeah, the zfs set atime=off was already done....
>
> >
> > Can you provide a histogram of the count of files per directory?
>
> Excuse-me, but I don't understand....
Distribution of files per directory, example:
1000 files in 9 dirs
1001 files in 12 dirs
find /path_to_root/ -type f | sed 's/\/[^/]*$//' | uniq -c | \
awk '{print $1}' | sort -n | uniq -c
That will print out the number of files per dir.
2 98
3 102
1 103
2 105
Or something like that.
--
- Alfred Perlstein
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