[Numpy-discussion] Building numpy with OpenBLAS

Sturla Molden sturla at molden.no
Fri Dec 14 07:04:14 EST 2012

On 14.12.2012 10:17, Sergey Bartunov wrote:

> Now things went even worse. I assume that numpy built with BLAS and
> LAPACK should do dot operation faster than "clean" installation on
> relatively large matirces (say 2000 x 2000). Here I don't use OpenBLAS
> anyway.

No, _dotblas is only built against ATLAS, MKL or Apple's accelerate 
framework. So with OpenBLAS you have to call e.g. DGEMM from OpenBLAS 
yourself instead of using np.dot.

> So how can I fix this? Many thanks in advance.

You might fix NumPy to build _dotblas against OpenBLAS as well :)


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