[Python-Dev] Fixing the GIL (with a BFS scheduler) (original) (raw)
Nick Coghlan ncoghlan at gmail.com
Tue May 18 13:22:55 CEST 2010
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Nir Aides wrote:
I would like to restart this thread with 2 notes from the lively discussion:
a) Issue 7946 (and this discussion?) concerns Python 3.2 b) The GIL problems are not specific to OSX. The old and new GIL misbehave on GNU/Linux and Windows too.
I think Antoine and Bill went off an a bit of a tangent that is specific to Mac OS X and the old GIL (where a Python application not only fails to take advantage of additional cores, but actually runs slower than it does on a less powerful single core machine).
The convoying problem identified in issue 7946 does indeed apply to the new GIL on multiple platforms. Without reviewing either proposed patch in detail, I personally am slightly inclined to favour David's suggested solution, both because I better understand the explanation of how it works (and simplicity is a virtue from a maintainability point of view), and because the BFS approach appears to run into trouble when it comes to identifying a suitable cross platform time reference.
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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