linux-kernel - Re: invalidate/drop filesystem caches & io buffers

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Message-Id: <200611081358.25245.mail@earthworm.de>
Date:	Wed, 8 Nov 2006 13:58:25 +0100
From:	"Hesse, Christian" <mail@...thworm.de>
To:	"Yakov Lerner" <iler.ml@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: invalidate/drop filesystem caches & io buffers

On Wednesday 08 November 2006 13:53, Yakov Lerner wrote:
> I'd like to invalidate/free the filesystem caches and io buffer cache
> How can I do this when I can't unmount the filesystem (and w/o reboot) ?
>
> (I run filesystem I/O test that needs to  start from fresh  cache &
> buffer state -- as emty as possible, like right after mount/boot).
>
> I tried  'mount -o remount' but it didn't make any difference
> on the timing. Apparently 'mount -o remount' did not invalidate
> cases/buffers ? ( The difference between fresh run vs non-fresh
> run timing is x5 times ).

You can do

echo 3 > /proc/sys/vm/drop_caches

Take a look at filesystems/proc.txt for details.
-- 
Regards,
Christian

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