linux-ext4 - Large File Deletion Comparison (ext3, ext4, XFS)

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Date:	Fri, 27 Apr 2007 15:41:19 +0200
From:	Valerie Clement <valerie.clement@...l.net>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Large File Deletion Comparison (ext3, ext4, XFS)

As asked by Alex, I included in the test results the file fragmentation 
level and the number of I/Os done during the file deletion.

Here are the results obtained with a not very fragmented 100-GB file:

                  |     ext3       ext4 + extents      xfs
------------------------------------------------------------
  nb of fragments |     796             798             15
  elapsed time    |  2m0.306s        0m11.127s       0m0.553s
                  |
  blks read       |  206600            6416            352
  blks written    |   13592           13064            104
------------------------------------------------------------


And with a more fragmented 100-GB file:

                  |     ext3       ext4 + extents       xfs
------------------------------------------------------------
  nb of fragments |   20297           19841            234
  elapsed time    | 2m18.914s        0m27.429s      0m0.892s
                  |
  blks read       |  225624           25432            592
  blks written    |   52120           50664            872
------------------------------------------------------------


More details on our web site:
http://www.bullopensource.org/ext4/20070404/FileDeletion.html

    Valérie
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