New issue 2858: In some cases, the GIL is not released often enough
https://bitbucket.org/pypy/pypy/issues/2858/in-some-cases-the-gil-is-not-released

Armin Rigo:

The GIL is implemented with optimizations that try to not release it during a 
burst of very short C calls.  But in some cases these optimizations are too 
eager and cause the GIL to remain in the same thread, seemingly for up to 20ms. 
 See attached demo.


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