From: Gerd Stolpmann <info@gerd-stolpmann.de>
To: Joel Reymont <joelr1@gmail.com>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] appending data to a mmap-ed file
Date: Thu, 16 Dec 2010 13:57:58 +0100 [thread overview]
Message-ID: <1292504278.22147.292.camel@thinkpad> (raw)
In-Reply-To: <8D1E9D5B-188C-4AF3-980B-EF229BA98FB4@gmail.com>
Am Donnerstag, den 16.12.2010, 11:31 +0000 schrieb Joel Reymont:
> I'm constantly appending to a file of stock quotes (ints, longs, doubles, etc.). I have this file mapped into memory with mmap.
>
> What's the most efficient way to make newly appended data available as part of the memory mapping?
Generally, you can only unmap the old mapping, and remap it. Don't know
whether you have an OS preference - Linux has also mremap, and it would
at least be possible to create a binding for it. mremap is non-portable,
though.
If you have all rights to define the file format yourself, I'd suggest
you use some kind of container, so you can append to the file in larger
chunks, and only when you need a new chunk, the mapping needs to be
re-established.
Gerd
>
> Obligatory OCaml content: I'm trying to prototype a trading system in OCaml.
>
> Thanks, Joel
>
> ---
> http://twitter.com/wagerlabs
>
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--
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Gerd Stolpmann, Bad Nauheimer Str.3, 64289 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:[~2010-12-16 12:58 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-16 11:31 Joel Reymont
2010-12-16 12:38 ` [Caml-list] " Jesper Louis Andersen
2010-12-16 13:13 ` Joel Reymont
2010-12-16 12:57 ` Gerd Stolpmann [this message]
2010-12-16 17:16 ` Richard W.M. Jones
2010-12-17 0:36 ` Goswin von Brederlow
2010-12-17 14:48 ` Richard W.M. Jones
2010-12-17 15:49 ` Joel Reymont
2010-12-17 19:05 ` Goswin von Brederlow
2010-12-18 9:56 ` Christophe Raffalli
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