From: Bryan Richardson <btricha@...>
Date: 2008-10-15T22:24:52+09:00
Subject: Re: Multiple Processors on Windows 64-bit

Thanks for the reply Robert.  I'm accessing a MySQL database from the
scripts rather than the file system.  Would this have the same
bottleneck?

--
Bryan

On Wed, Oct 15, 2008 at 1:27 AM, Robert Klemme
<shortcutter@googlemail.com> wrote:
> 2008/10/14 Bryan Richardson <btrichardson@gmail.com>:
>> 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.
>
> The default for the OS scheduler (even on Windows) is to distribute
> runnable processes across all processors. Did you accidentally set
> affinity to a single CPU?
>
>> Any ideas?!
>
> What makes you sure it's a CPU issue?  For example, a common
> bottleneck is the file system.  So if all your Ruby programs are IO
> intensive and read / write on the same FS they will likely suffer from
> this bottleneck.
>
> You could easily check what the OS does by running a CPU only script,
> e.g. on a bash prompt you can do a 30 second test with this:
>
> for i in 1 2 3 4; do ruby -e "t=Time.now + 30; 1 while Time.now < t;
> puts 'done $i'"& done
>
> Kind regards
>
> robert
>
> --
> remember.guy do |as, often| as.you_can - without end
>
>