From: c-bauer-olsbruecken@t-online.de (Christoph Bauer)
To: skaller <skaller@users.sourceforge.net>
Cc: Erik de Castro Lopo <mle+ocaml@mega-nerd.com>,
caml-list@yquem.inria.fr, matthieu.dubuget@laposte.net
Subject: Re: [Caml-list] ANNOUNCE : libsndfile-ocaml alpha
Date: Tue, 02 Jan 2007 08:47:14 +0100 [thread overview]
Message-ID: <87hcv96fb1.fsf@elefant.olsbruecken.local> (raw)
In-Reply-To: <1167699073.13679.15.camel@rosella.wigram> (skaller@users.sourceforge.net's message of "Tue\, 02 Jan 2007 11\:51\:13 +1100")
skaller <skaller@users.sourceforge.net> writes:
> On Tue, 2007-01-02 at 06:58 +1100, Erik de Castro Lopo wrote:
>> That file
>> is:
>>
>> 96000 * 60 * 60 * 8 * 4 bytes =>
>> 11059.200 Mbytes =>
>> 11.059 Gbytes
>>
>> Nobody is going to load the whole of that file into memory at once.
>
> Why not? That's tiny compared to available address space on a 64
> bit machine, and personal computers have heaps
> of free address space.
I had to deal with big files and OCaml too and Erik's approach
sound good to me.
On 64 bit machines you may mmap huge files, but you can't on 32-bit
machines. I run in troubles with files > 700MB. Maybe you could mmap
smaller blocks, but this isn't possible with the current
implementation of bigarrays mmap (since you need to mmap with an
offset). Furthermore mmap is a bit different on different operation
system.
Measurements show that mmap doesn't mean a big (or any) speed
up. For the OS the advantage is, that no swap space needs to be
reservered.
Christoph Bauer
next prev parent reply other threads:[~2007-01-02 7:47 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
2007-01-03 1:59 ` Pal-Kristian Engstad
2007-01-03 2:49 ` Markus Mottl
2007-01-02 7:47 ` Christoph Bauer [this message]
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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