New issue 2517: Example scientific numpy code 6x slower in pypy
https://bitbucket.org/pypy/pypy/issues/2517/example-scientific-numpy-code-6x-slower-in

lesshaste:

The attached numpy code computes the permanent of a matrix and is about 6 times 
slower in pypy 5.7 than cpython.  This is a problem in real scientific code so 
we have resorted to using cython currently.

time python test.py
-3.11279519223e-07

real    0m5.085s
user    0m5.180s
sys     0m0.304s

time bin/pypy test.py
-3.11279519223e-07

real    0m33.465s
user    0m33.412s
sys     0m0.036s


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