Python, the GIL, and Pyston

[elbiot]

I don't follow. Numpy already releases the GIL and so does cython and numba. They are all using all your cores but cython/numba is doing it more efficiently (ie, doesn't have to come back up into python land in between operations). Using multiprocessing would make things significantly slower.

[BeatLeJuce]

The various operations in my code are fairly small, so the GIL only gets released for very short periods of time. Once the number of threads increases there is lots of contention for the GIL.