[ale] Comparing EXT4 and JFS

[Jim Kinney]

On Wed, Feb 4, 2009 at 6:25 PM, Greg Freemyer <greg.freemyer at gmail.com> wrote:
> 2009/2/4 Kenneth Price <neth.price at gmail.com>:
> <snip>
>>> Seems like XFS used to take a couple minutes to do the delete!!!
>>> Obviously not a good choice of filesystem if you plan to do a lot of
>>> kernel development.
>>
>> WHAT?  In my real world experiences XFS is *much* faster than EXT3 at
>> deleting large files - as well as large directories of small files.  Is your
>> comment from personal experience?  Using a 2.6.X kernel?
>>
>> -Ken
>
> Okay, I just tested this:
>
> Using 2.6.22 on Suse 10.3 machine.
>
> I made a copy of linux source tree (cp --archive /usr/src/linux-2.6.22.19-0.2 .)
>
> Then I immediately did a timed delete:
>
> time rm -rf linux-2.6.22.19-0.2
>
> Ext3:  1.1 seconds
> XFS: 1 min 6.9 seconds
>
> You may want to double check your working assumptions.

Large files not large number of small files. XFS clears inodes used by
files, ext3 only clears the journal record and the directory listing
inode data.

XFS is not suitable for small files (on the order of 4k or less). It
is designed for multi-GB sized files (and IRIX stuff :-)
>
> Greg
> --
> Greg Freemyer
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-- 
-- 
James P. Kinney III