How to check BLAS/LAPACK linkage in NumPy and SciPy?

python numpy scipy lapack blas
Woltan picture Woltan · Jan 25, 2012 · Viewed 77k times · Source

I am builing my numpy/scipy environment based on blas and lapack more or less based on this walk through.

When I am done, how can I check, that my numpy/scipy functions really do use the previously built blas/lapack functionalities?

Answer

davost picture davost · Oct 13, 2013

The method numpy.show_config() (or numpy.__config__.show()) outputs information about linkage gathered at build time. My output looks like this. I think it means I am using the BLAS/LAPACK that ships with Mac OS. 

>>> import numpy as np
>>> np.show_config()

lapack_opt_info:
    extra_link_args = ['-Wl,-framework', '-Wl,Accelerate']
    extra_compile_args = ['-msse3']
    define_macros = [('NO_ATLAS_INFO', 3)]
blas_opt_info:
    extra_link_args = ['-Wl,-framework', '-Wl,Accelerate']
    extra_compile_args = ['-msse3', '-I/System/Library/Frameworks/vecLib.framework/Headers']
    define_macros = [('NO_ATLAS_INFO', 3)]

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