On 26/07/2010 04:42, Guido van Rossum wrote:
On Sun, Jul 25, 2010 at 8:31 PM, Peter Portante
<peter.a.porta...@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?
At Resolver Systems we created a "calculation system" that does large
calculations on background threads using IronPython. Doing them on a
background thread allows the ui to remain responsive. Several
calculations could run simultaneously using multiple cores.
As the calculation operates on a large object graph (which the ui then
needs access to in order to display it) using multiprocessing would have
imposed a very big overhead due to serialization / deserialization (the
program runs on windows).
Using CPython would have made the program a lot slower due to the GIL.
All the best,
Michael
--
http://www.ironpythoninaction.com/
http://www.voidspace.org.uk/blog
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