linux-kernel - Re: getdents - ext4 vs btrfs performance

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Message-ID: <CADDYkjRv=ASgzJV25beyN3t=7=djRcRAxy0tEqcZ9NX300boBg@mail.gmail.com>
Date:	Thu, 15 Mar 2012 08:59:38 +0100
From:	Jacek Luczak <difrost.kernel@...il.com>
To:	"Ted Ts'o" <tytso@....edu>,
	Jacek Luczak <difrost.kernel@...il.com>,
	linux-ext4@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-btrfs@...r.kernel.org
Subject: Re: getdents - ext4 vs btrfs performance

2012/3/10 Ted Ts'o <tytso@....edu>:
> Hey Jacek,
>
> I'm curious parameters of the set of directories on your production
> server.  On an ext4 file system, assuming you've copied the
> directories over, what are the result of this command pipeline when
> you are cd'ed into the top of the directory hierarchy of interest
> (your svn tree, as I recall)?
>
> find . -type d -ls | awk '{print $7}' | sort -n | uniq -c
>
> I'm just curious what the distribution of directories sizes are in
> practice for your use case...
>

Hi Ted,

below is from the latest upstream on ext4:

 843341 4096
    165 12288
     29 16384
    164 20480
     26 24576
     22 28672
     24 32768
    118 36864
     12 40960
     19 45056
      3 49152
     12 53248
     37 57344
     10 61440
      2 65536
     13 69632
      1 131072
      1 139264
      1 143360
      1 221184
      1 249856
      1 258048
      1 262144
      1 319488
      2 335872
      1 339968

-Jacek
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