From: Glen Holcomb <damnbigman@...>
Date: 2009-10-30T05:30:15+09:00
Subject: Re: Using multicore CPUs in parallel tasks

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On Thu, Oct 29, 2009 at 2:04 PM, Tony Arcieri <tony@medioh.com> wrote:

> On Thu, Oct 29, 2009 at 11:48 AM, Glen Holcomb <damnbigman@gmail.com>
> wrote:
>
> > You are going to want Ruby 1.9 for this.  In 1.8 threads are "green",
> > basically they only exists as threads inside the VM so you still only h=
it
> > one core and any blocking system I/O will block all of your threads.
> >
>
> Ruby 1.9 isn't going to help you when using threads to distribute
> computation across CPU cores.  The Global VM Lock ensures that simultaneo=
us
> computation is still limited to one core.
>
> JRuby, on the other hand, does not have this limitation.  On MRI/1.9 I
> would
> recommend using multiple processes.
>
> --
> Tony Arcieri
> Medioh/Nagravision
>

Ah, I did not know that.

--=20
"Hey brother Christian with your high and mighty errand, Your actions speak
so loud, I can=92t hear a word you=92re saying."

-Greg Graffin (Bad Religion)

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