[Numpy-discussion] Strategy for OpenBLAS

Sturla Molden sturla.molden at gmail.com
Tue May 26 13:02:33 EDT 2015

Matthew Brett <matthew.brett at gmail.com> wrote:

> I am getting the impression that OpenBLAS is looking like the most
> likely medium term solution for open-source stack builds of numpy and
> scipy on Linux and Windows at least.

I think you right. 

OpenBLAS might even be a long-term solution. We should also consider that
GotoBLAS (and GotoBLAS2) powered some of the World's most expensive
superomputers for a decade. It is not like this is untested software. 

The remaining test errors on Windows are also due to MSVC and MinGW-w64
differences, not due to OpenBLAS itself, and those are not relevant on

On Apple, I am not sure which is better. Accelerate is faster in some
corner cases (level-1 BLAS with AVX, operations on very small matrices),
but it has issues with multiprocessing (GCD's threadpool is not forksafe).
Apart from that OpenBLAS and Accelerate are about equivalent in
performance. I have built OpenBLAS on OSX with clang and gfortran, it works
like a charm. So it might be worth cobsidering for binary wheels on OSX as


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