From: Josh Cheek <josh.cheek@...>
Date: 2011-10-19T22:26:12+09:00
Subject: Re: Ruby and threading

--00221597573675679b04afa6c8a4
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

On Wed, Oct 19, 2011 at 7:56 AM, Sandor Sz=FCcs <sandor.szuecs@fu-berlin.de=
>wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
>
> On 10/19/11 9:11 AM, Josh Cheek wrote:
>
> > ruby-1.9.3-rc1 0.064 seconds 400000 elements in array (should be
> > 400000)
> >
> > rbx-2.0.0pre 0.232 seconds 398877 elements in array (should be
> > 400000)
> >
> > jruby-1.6.4 0.069 seconds 398709 elements in array (should be
> > 400000)
> >
> > macruby-0.10 0.076 seconds 366231 elements in array (should be
> > 400000)
> >
> >
> > $ cat needs_gil.rb puts '', ENV['RUBY_VERSION']
> >
> > @array, threads =3D [], [] start =3D Time.now 4.times do threads <<
> > Thread.new { (1..100_000).each {|n| @array << n} } end
> > threads.each{|t| t.join } stop =3D Time.now
> >
> > puts "%0.3f seconds" % (stop - start), @array.size
>
> I think it's pretty obvious, that implementations without GIL should
> behave exactly as you have shown.
> You did not use synchronization to append an item to your shared
> object, so sometimes items will get lost.
> - --
>

That's the point, to show why the GIL is useful.

--00221597573675679b04afa6c8a4--