I'm suspicious of pyperformance testing for this reason:

The point of Python is operating OK despite GIL because "most of the time is 
spent in 'external' libraries."

Pyperformance tests "typical" python performance where supposedly most tests 
are "ok" despite GIL. You need multithreading in atypical situations which may 
involve a lot of raw-python-object "thrashing," with high ref-counting, locks, 
etc. How do we know that pyperformance actually tests these cases well?
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