From: "Stephen C. Tweedie" <sct@dcs.ed.ac.uk>
To: Rik van Riel <H.H.vanRiel@phys.uu.nl>
Cc: Linux MM <linux-mm@kvack.org>
Subject: Re: Memory management. (fwd)
Date: Thu, 25 Jun 1998 22:08:39 +0100 [thread overview]
Message-ID: <199806252108.WAA16230@dax.dcs.ed.ac.uk> (raw)
In-Reply-To: <Pine.LNX.3.96.980625175920.31988G-100000@mirkwood.dummy.home>
Hi,
On Thu, 25 Jun 1998 18:00:15 +0200 (CEST), Rik van Riel
<H.H.vanRiel@phys.uu.nl> said:
> From: Stefane Fermigier <fermigie@math.jussieu.fr>
> To: H.H.vanRiel@phys.uu.nl
> Subject: Memory management.
> He said that under most circumstances, Linux was able to get the best
> results, but that when huge amounts of data were to be transfered from and
> then to disk during the computations, performances were dropping badly.
> This would appear when the size of the files that are manipulated
> is _half_ of the RAM of the systems, when one would think that RAM
> just (approximately) _equal_ to the size of the files would be enough.
> According to Remy Card, this might be a question of ``double buffering'',
> that is, the data would go to _two_ different RAM buffers instead of just
> one.
That's right --- it's the old problem of buffering writes through the
buffer cache and reads through the page cache. Do you want me to reply
to this to say we know about it?
--Stephen
next prev parent reply other threads:[~1998-06-25 21:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-06-25 16:00 Rik van Riel
1998-06-25 21:08 ` Stephen C. Tweedie [this message]
1998-06-26 4:48 ` Rik van Riel
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