From: "Hesse, Christian" <mail@earthworm.de>
To: "Yakov Lerner" <iler.ml@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: invalidate/drop filesystem caches & io buffers
Date: Wed, 8 Nov 2006 13:58:25 +0100 [thread overview]
Message-ID: <200611081358.25245.mail@earthworm.de> (raw)
In-Reply-To: <f36b08ee0611080453p5401de04td2fef8bff4d0efb3@mail.gmail.com>
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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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prev parent reply other threads:[~2006-11-08 12:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-08 12:53 invalidate/drop filesystem caches & io buffers Yakov Lerner
2006-11-08 12:55 ` Arjan van de Ven
2006-11-08 12:58 ` Hesse, Christian [this message]
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