Kjetil Torgrim Homme wrote:
> Jesper Krogh <jesper AT krogh DOT cc> writes:
> 
>> Can you give us the time for doing a tar to /dev/null of the fileset.
>>
>> time tar cf /dev/null /path/to/maildir
>>
>> Then we have a feeling about the "actual read time" for the file of
>> the filesystem.
> 
> if you're using GNU tar, it will *not* read the files if you dump to
> /dev/null.  it will simply stat the files as necessary (you can check
> this with strace if you like.)

Thanks The numers actually surprised me when posted. I usually do a

tar cf - /path | pv > /dev/null

pv prints the speed of the stream, so I dont have to wait for it to 
complete to get a feeling.

> use /dev/zero to avoid this optimisation.

Thank, nice tip.

-- 
Jesper

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