Re: CPU consumption with GtkThread

Hi,

I actually made it adaptive later on[1]. The drawback was that
animations could take more time to update. The adaptative version
worked quite well but reducing the delay wasn't instantaneous. It was
pretty dumb and experimental, I could probably put more thought in it
if needed.
One of my test was using the acid3 test[2]. Basically, each step of
the animation required one iteration of the loop. So depending on your
uses it might or might not be a good idea.

Then, at the OCaml Hacking Day, Jérémie Dimino told me to try Lwt's
support[3]. Since you'll only be using lwt threads, you won't have to
use GtkThread. IIRC it's only a matter of putting the following at the
top of your code instead:
  let () = Lwt_glib.init ()
(and of course, link against lwt-glib)

Haven't had issues with it and you don't have to use lwt everywhere,
only sections that may take time.

Hope this helps


[1] http://git.ocamlcore.org/cgi-bin/gitweb.cgi?p=caravel/caravel.git;a=blob_plain;f=gtk_thread_bis/gtkThreadBis.ml;hb=67e29bc6550603fa42857569eb6f878f180949f2

[2] http://acid3.acidtests.org/

[3] http://ocsigen.org/lwt/doc/api/Lwt_glib.html


--

Adrien Nader


On 14/12/2010, Maxence Guesdon <[email protected]> wrote:
> On Tue, 14 Dec 2010 08:36:26 +0100
> Maxence Guesdon <[email protected]> wrote:
>
>> Hello,
>>
>> When I use GtkThread.main (), my process consumes a lot of CPU. Having a
>> look at the code of GtkThread.ml, I see a never ending loop, and
>> especially
>> a never-delaying loop, which I think results in the consumption.
>>
>> Is it normal ? Isn't there a way to use threads without such a consumption
>> ?
>
> Well, I just saw that Adrien proposed a workaround/fix for this problem on
> the list one year ago:
>   http://yquem.inria.fr/pipermail/lablgtk/2009-December/000335.html
>
> He changed
>   Thread.delay 0.0001;
> into
>   Thread.delay 0.013;
>
> Could we integrate this ? And may be provide a function to change the delay
> used in the fix ?
>
> Regards,
>
> Maxence
>
>
>
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