linux-kernel - Re: -mm merge plans for 2.6.23

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Date:	Wed, 25 Jul 2007 01:07:25 -0700 (PDT)
From:	david@...g.hm
To:	Rene Herman <rene.herman@...il.com>
cc:	Ray Lee <ray-lk@...rabbit.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ck list <ck@....kolivas.org>, Ingo Molnar <mingo@...e.hu>,
	Paul Jackson <pj@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: -mm merge plans for 2.6.23

On Wed, 25 Jul 2007, Rene Herman wrote:

> On 07/25/2007 06:46 AM, david@...g.hm wrote:
>
>>  you could make a synthetic test by writing a memory hog that allocates 3/4
>>  of your ram then pauses waiting for input and then randomly accesses the
>>  memory for a while (say randomly accessing 2x # of pages allocated) and
>>  then pausing again before repeating
>
> Something like this?
>
>>  run two of these, alternating which one is running at any one time. time
>>  how long it takes to do the random accesses.
>>
>>  the difference in this time should be a fair example of how much it would
>>  impact the user.
>
> Notenotenote, not sure what you're going to show with it (times are simply as 
> horrendous as I'd expect) but thought I'd try to inject something other than 
> steaming cups of 4-letter beverages.

when the swap readahead is enabled does it make a significant difference 
in the time to do the random access?

if it does that should show a direct benifit of the patch in a simulation 
of a relativly common workflow (startup a memory hog like openoffice then 
try and go back to your prior work)

David Lang

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