Why are you asking this using a throwaway? np.dot() is multicore. np.load () (and family) releases the GIL. SIMD mostly depends on the build system, so if you

Why are you asking this using a throwaway? np.dot() is multicore. np.load () (and family) releases the GIL. SIMD mostly depends on the build system, so if you want it you might need to build NumPy from source. https://stackoverflow.com/questions/24022723/where-can-i-find-a-list-of-numpy-functions-which-release-the-gil https://stackoverflow.com/questions/24022723/where-can-i-fin...