linux-kernel - Re: how to empty buffers/cache?

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Message-Id: <1210697896.4964.104.camel@localhost>
Date:	Tue, 13 May 2008 18:58:16 +0200
From:	Soeren Sonnenburg <kernel@....de>
To:	Alejandro Riveira Fernández 
	<ariveira@...il.com>, "Carlos R\. Mafra" <crmafra2@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: how to empty buffers/cache?

On Sat, 2008-05-10 at 00:11 +0200, Alejandro Riveira Fernández wrote:
> El Fri, 09 May 2008 21:49:47 +0000
> Soeren Sonnenburg <kernel@....de> escribió:
> 
> > Dear all,
> > 
> > I am trying to perform some benchmarks that involve reading the same big
> > file a couple of times from disk. However I would want to make sure that
> > the file is not buffered/cached by the kernel when I read the file a
> > second/third/etc time.
> > 
> > Is there a way (except rebooting/unmounting the disk) to clear the
> > buffers?
> 
>  echo 3  > /proc/sys/vm/drop_caches IIRC

thank you both very much ( echo 3 > ... is what I was looking for)

Soeren
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