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List:       python-dev
Subject:    Re: [Python-Dev] Thoughts fresh after EuroPython
From:       Michael Foord <fuzzyman () voidspace ! org ! uk>
Date:       2010-07-26 10:02:16
Message-ID: 4C4D5D28.90603 () voidspace ! org ! uk
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On 26/07/2010 04:42, Guido van Rossum wrote:
> On Sun, Jul 25, 2010 at 8:31 PM, Peter Portante
> <peter.a.portante@gmail.com>  wrote:
> 
> > FWIW: We use Python at Tabblo, straddled across Python 2.5.4 and 2.6.5. They
> > work. And they work well. But we make light use of threads (mostly
> > background I/O handling), and heavy use of multiple processes because we
> > can't take advantage of our multi-core systems otherwise.
> > 
> Isn't this an indication that the GIL is, in fact, not (much of) a problem?
> 
> I wish those trying to get rid of the GIL well. But it may not be the
> panacea some folks are hoping for. Multi-threaded programming remains
> hard (and removing the GIL might actually make it harder).
> 
> Jython and IronPython don't have a GIL, and I think PyPy may not
> either. Does anyone have experience with GIL-free programming in one
> of those?
> 
> 
Oh, and PyPy does have a GIL but the developers say it wouldn't be a 
huge amount of work to remove it.

Presumably they would have to add locking in the right places - which 
would then impact performance. As PyPy doesn't use reference counting 
adding locking shouldn't impact performance as much as previous attempts 
with CPython have.

Michael

-- 
http://www.ironpythoninaction.com/
http://www.voidspace.org.uk/blog

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