From: Charles Oliver Nutter <headius@...>
Date: 2012-08-29T02:10:54+09:00
Subject: Re: force child threads run paralelly?

On Tue, Aug 28, 2012 at 11:11 AM, ajay paswan <lists@ruby-forum.com> wrote:
> And even I select 1.8, it has the same problem.. I cannot run both
> thread parallelly!

There are only four Ruby implementations that can run threads
concurrently (which is what you are looking for):

* JRuby - always has had concurrent threads because the JVM has
concurrent threads
* Rubinius - switched to concurrent threading a bit over a year ago
* MacRuby - switched to concurrent threading some years ago
* IronRuby - always has had concurrent threads because the .NET CLR
has concurrent threads

Of these, Rubinius is closest to "100%" compatible with regular Ruby,
since it also supports C extensions. JRuby arguable has the most
stable thread implementation, since it's the JVM's threads and they've
been parallel for over a decade. MacRuby only works on OS X. IronRuby
only works on .NET platforms, but I think it works ok on Mono.

You cannot get concurrent threads on any version or build of standard
Ruby ("C Ruby", "MRI", "MatzRuby") at this time. Pick something else.

- Charlie