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Date: -- (:)
From: Yaron Minsky <yminsky@g...>
Subject: Re: [Caml-list] Threads performance issue.
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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