Re: clearing filesystem cache for I/O benchmarks

[Andreas Haumer]

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Hi!

Benjamin Rutt wrote:
> How can I purge all of the kernel's filesystem caches, so I can trust
> that my I/O (read) requests I'm trying to benchmark bypass the kernel
> filesystem cache?

Some time ago I was looking for that, too, and found "cfree". Have a
look at <http://gizmolabs.org/~andrew/andrewweb/project.php?pid=3&tab=0>

It's a small utility and kernel module for linux-2.4 written by
Andrew de los Reyes. It allows to clear portions of the buffer cache
(e.g. for a complete sub-directory). I haven't analyzed it so I can't
say if it does things correctly, though.

HTH

- - andreas

- --
Andreas Haumer                     | mailto:andreas@xxxxxxxxx
*x Software + Systeme              | http://www.xss.co.at/
Karmarschgasse 51/2/20             | Tel: +43-1-6060114-0
A-1100 Vienna, Austria             | Fax: +43-1-6060114-71
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