From: Yaron Minsky <yminsky@gmail.com>
To: "Rémi Dewitte" <remi@gide.net>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Threads performance issue.
Date: Mon, 16 Feb 2009 11:47:27 -0500 [thread overview]
Message-ID: <891bd3390902160847p25ad3bf1pe59da620dfc667f2@mail.gmail.com> (raw)
In-Reply-To: <2184b2340902160715y1f935b5ehc0e6195b3f75b66b@mail.gmail.com>
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2009/2/16 Rémi Dewitte <remi@gide.net>
> Hello,
>
> I would like to read two files in two different threads.
>
> I have made a first version reading the first then the second and it takes
> 2.8s (native).
>
> I decided to make a threaded version and before any use of thread I
> realized that just linking no even using it to the threads library makes my
> first version of the program to run in 12s !
Do you have a short benchmark you can post? The idea that the
thread-overhead would make a difference like that, particularly for IO-bound
code (which I'm guessing this is) is pretty surprising.
y
>
> I use pcre, extlib, csv libraries as well.
>
> I guess it might come from GC slowing down thinks here, doesn't it ? Where
> can it come from otherwise ? Is there a workaround or something I should
> know ?
>
> Can ocaml use multiple cores ?
>
> Do you have few pointers on libraries to make parallel I/Os ?
>
> Thanks,
> Rémi
>
> _______________________________________________
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next prev parent reply other threads:[~2009-02-16 16:47 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-16 15:15 Rémi Dewitte
2009-02-16 15:28 ` [Caml-list] " Michał Maciejewski
2009-02-16 15:32 ` Rémi Dewitte
2009-02-16 15:42 ` David Allsopp
2009-02-16 16:07 ` Rémi Dewitte
2009-02-16 16:32 ` Sylvain Le Gall
2009-02-17 13:52 ` [Caml-list] " Frédéric Gava
2009-02-16 16:47 ` Yaron Minsky [this message]
2009-02-16 17:37 ` [Caml-list] " Rémi Dewitte
2009-02-17 7:40 ` Rémi Dewitte
2009-02-17 8:59 ` Mark Shinwell
2009-02-17 9:09 ` Rémi Dewitte
2009-02-17 9:53 ` Jon Harrop
2009-02-17 10:07 ` Sylvain Le Gall
2009-02-17 10:26 ` [Caml-list] " Mark Shinwell
2009-02-17 10:50 ` Rémi Dewitte
2009-02-17 10:56 ` Mark Shinwell
2009-02-17 11:33 ` Jon Harrop
2009-02-17 12:20 ` Yaron Minsky
2009-02-17 12:26 ` Rémi Dewitte
2009-02-17 17:14 ` Sylvain Le Gall
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