From: Bryan Richardson <btricha@...>
Date: 2008-10-15T22:25:17+09:00
Subject: Re: Multiple Processors on Windows 64-bit

Thanks Park.  I will definitely try this out.

--
Bryan

On Wed, Oct 15, 2008 at 2:36 AM, Heesob Park <phasis@gmail.com> wrote:
> 2008/10/15 Bryan Richardson <btrichardson@gmail.com>:
>> Hello all,
>>
>> Does anyone know if it's possible to force multiple Ruby applications to
>> run on different processors?  I've got a dual quad-core machine that is
>> running Windows XP 64-bit and I'd like to run multiple Ruby applications
>> on it.  However, when running multiple applications, it looks like they
>> are sharing the same processor -- one application will do some work for
>> a while, then another one will, then another.  They aren't all doing
>> work at the same time.
>>
>> Any ideas?!
>>
> On Windows 2003 or later, you can manually set CPU affinity using
> start utility in the command prompt.
>
> To start ruby process on CPU 0:
>
> start /affinity 1 ruby some.rb
>
>
> Affinity number is
> 1st core = 1
> 2nd core = 2
> 3rd core = 4
> 4th core = 8
> 5th core = 10 ( hexadecimal 16 )
> 6th core = 20 ( hexadecimal 32 )
>
> You can also set CPU affinity with PsExec utiltiy.
>
> Regards,
>
> Park Heesob
>
>