From: Gerd Stolpmann <info@gerd-stolpmann.de>
To: Erik de Castro Lopo <mle+ocaml@mega-nerd.com>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] ANNOUNCE : libsndfile-ocaml alpha
Date: Wed, 03 Jan 2007 00:46:14 +0100 [thread overview]
Message-ID: <1167781575.8359.21.camel@localhost.localdomain> (raw)
In-Reply-To: <20070103093701.3b827e81.mle+ocaml@mega-nerd.com>
Am Mittwoch, den 03.01.2007, 09:37 +1100 schrieb Erik de Castro Lopo:
> BTW, anyone mmaping files on Linux for performance reasons should
> be aware that Linus himself doesn't think mmap will have any
> performance improvement over read:
>
> http://www.cs.helsinki.fi/linux/linux-kernel/2001-40/1661.html
Just a quick and somehow interesting observation: Linus assumes that the
read buffer is page-aligned in this comparison, something you cannot
expect in most higher languages (of course you can arrange that in
libsndfile - did you?). That reminds me that the OS guys live in another
world. Would be interesting which function wins if you compare Unix.read
(which does not care about alignment, and does an extra copy) with
Bigarray.mmap.
Gerd
--
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Gerd Stolpmann * Viktoriastr. 45 * 64293 Darmstadt * Germany
gerd@gerd-stolpmann.de http://www.gerd-stolpmann.de
Phone: +49-6151-153855 Fax: +49-6151-997714
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next prev parent reply other threads:[~2007-01-02 23:46 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-22 4:54 Erik de Castro Lopo
2006-12-27 9:32 ` [Caml-list] " Vu Ngoc San
2006-12-27 10:10 ` Erik de Castro Lopo
2006-12-27 10:42 ` Erik de Castro Lopo
2006-12-30 21:07 ` Erik de Castro Lopo
2006-12-31 3:31 ` skaller
2006-12-31 4:23 ` Erik de Castro Lopo
2006-12-31 11:08 ` Richard Jones
2006-12-31 22:51 ` Erik de Castro Lopo
2007-01-01 14:53 ` Matthieu Dubuget
2007-01-01 19:58 ` Erik de Castro Lopo
2007-01-02 0:51 ` skaller
2007-01-02 1:14 ` Erik de Castro Lopo
2007-01-02 5:26 ` Erick Tryzelaar
2007-01-02 5:39 ` Erik de Castro Lopo
[not found] ` <1167765505.5341.12.camel@rosella.wigram>
2007-01-02 22:37 ` Erik de Castro Lopo
2007-01-02 23:46 ` Gerd Stolpmann [this message]
2007-01-03 1:59 ` Pal-Kristian Engstad
2007-01-03 2:49 ` Markus Mottl
2007-01-02 7:47 ` Christoph Bauer
2006-12-31 19:05 ` skaller
2006-12-31 22:54 ` Erik de Castro Lopo
2007-01-02 10:56 ` Vu Ngoc San
2007-01-02 11:27 ` Erik de Castro Lopo
2007-01-02 19:39 ` David Baelde
2007-01-02 23:04 ` Erik de Castro Lopo
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