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Project Summary

Increase the granularity of GIL in python, allowing python threads to run concurrently in certain scenarios.

It is unclear if this work will improve multithreaded python performance: The additional mutex locking will adversely affect performance, possibly to an extent that concurrent threading does not compensate.

We take two approaches, represented on two branches: # granular: individual locks around global structures shared across threads (reference counts, etc), rather than holding a single lock over the entire interpreter. This is similar to Greg Stein's original work. # localize: attempts to reduce the amount of granular locking by moving some global structures (free lists, etc.) into the thread state.

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concurrent gil multithreaded python

In a Nutshell, lowgil...

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