Re: [Caml-list] ANNOUNCE : libsndfile-ocaml alpha

[Erik de Castro Lopo <mle+ocaml@mega-nerd.com>]

skaller wrote:

> Mmaping the file doesn't require pre-loading it, its loaded
> on demand by the paging system. Still, some files might not be mappable,
> depending on the OS and device they're on.

As I have already stated twice in this thread, libsndfile does not
mmap files. It just reads and/or writes :-).

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

Someone has benchmarked mmap vs read/write and found mmap lacking:

    http://lkml.org/lkml/2002/3/13/38

Interestingly, mmap is also slower than read on freebsd:

    http://lists.freebsd.org/pipermail/freebsd-questions/2004-June/050245.html
    http://lists.freebsd.org/pipermail/freebsd-questions/2004-June/050265.html

Erik
-- 
+-----------------------------------------------------------+
  Erik de Castro Lopo
+-----------------------------------------------------------+
"If you think C++ is not overly complicated, just what is a
protected abstract virtual base pure virtual private destructor
and when was the last time you needed one?" -- Tom Cargill