[issue8299] Improve GIL in 2.7

[David Beazley]

David Beazley <dave at dabeaz.com> added the comment:

The analysis of instruction cache behavior is interesting---I could definitely see that coming into play given the heavy penalty that one sees going to multiple cores (it's a side effect in addition everything else that goes wrong such as a huge increase in the number of system calls).

I will only point out that messing around with processor affinities is going to be problematic.  There are C/C++ extensions to Python that intentionally release the GIL and want to run fully multithreaded across as many cores as might be available.  Setting a processor affinities is going to be the exact opposite of what you want for code like that.

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<http://bugs.python.org/issue8299>
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