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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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