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

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Message-ID: <49BD7BEA.50307@fisher-privat.net>
Date:	Sun, 15 Mar 2009 23:06:34 +0100
From:	Alexey Fisher <bug-track@...her-privat.net>
To:	Sitsofe Wheeler <sitsofe@...oo.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: smart cache. ist is possible?

Hi,

Sitsofe Wheeler schrieb:
> 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...
> 

It is not what i mean. I know how to clear cache but exactly i do not 
won't it. I will use cache and it's working perfectly with small files. 
But there is a problem with big files. For example i have 4GB RAM, if i 
read 4,6GB file the cache is useless. The question is; are there any way 
to workaround it, except more RAM?
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