linux-kernel - Re: smart cache. ist is possible?

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Message-ID: <20090315181315.GA4369@silver.sucs.org>
Date:	Sun, 15 Mar 2009 18:13:15 +0000
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	Alexey Fisher <bug-track@...her-privat.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: smart cache. ist is possible?

Hi,

On Sun, Mar 15, 2009 at 04:28:55PM +0100, Alexey Fisher wrote:
> I found for my self how great is cache in linux. If read one file from
> disk, so i don't need to do it second time, chace will do the job. It
> speed up thing greatly. But i found it not working with realy big files.
> Like i have 4GB RAM, so if i read a file like 4.6GB, cache won't work.

Watch out - if you are doing cache tests you really want to be using
drop_caches ( http://linux-mm.org/Drop_Caches ) before your "cold" runs
so you can be sure that the cache really was empty before you started...

-- 
Sitsofe | http://sucs.org/~sits/
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