Do scipy.sparse functions release the GIL?
They do, for Scipy versions >= 0.14.0
Question
Do scipy.sparse functions, like csr._mul_matvec release the GIL?
Context
Python functions that wrap foreign code (like C) often release the GIL during execution, enabling parallelism with multi-threading.  This is common in the numpy codebase.  Is it also common in scipy.sparse?  If so which operations release the GIL?  If they don't release the GIL then is there a fundamental issue here why not or is it just lack of man-power?