[Numpy-discussion] building numpy with atlas on ubuntu edgy

[David Cournapeau]

Christian K wrote:
>
> Thanks, but that didn't help:
>
> atlas_info:
>   libraries lapack not found in /usr/lib/sse2
>   libraries f77blas,cblas,atlas not found in /usr/lib/atlas
>   libraries lapack_atlas not found in /usr/lib/atlas
>   libraries lapack not found in /usr/lib/sse2
>   libraries f77blas,cblas,atlas not found in /usr/lib
>   libraries lapack_atlas not found in /usr/lib
> numpy.distutils.system_info.atlas_info
> /media/hda6/home/ck/prog/scipy/numpy/numpy/distutils/system_info.py:903:
> UserWarning:
> *********************************************************************
>     Could not find lapack library within the ATLAS installation.
> *********************************************************************
>
>   warnings.warn(message)
>   FOUND:
>     libraries = ['f77blas', 'cblas', 'atlas']
>     library_dirs = ['/usr/lib/sse2']
>     language = c
>     define_macros = [('ATLAS_WITHOUT_LAPACK', None)]
>
> lapack_info:
>   libraries lapack not found in /usr/lib/sse2
>   libraries lapack not found in /usr/lib
>   NOT AVAILABLE
>
>
> Christian
>
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>
>
On Ubuntu and debian, you do NOT need any site.cfg to compile numpy with 
atlas support. Just install the package atlas3-base-dev, and you are 
done. The reason is that when *compiling* a software which needs atlas, 
the linker will try to find libblas.so in /usr/lib, not in 
/usr/lib/sse2. If you install atlas3-base-dev, the package will install 
those at the correct locations. I have updated the instructions for 
Ubuntu (also works for debian) on the wiki a few days ago:

http://www.scipy.org/Installing_SciPy/Linux#head-c5a062b2ecf76f746d78cfcde1dae00ae26109fe

Note that if you have also optimized version installed (sse, sse2), it 
will use those automatically when you launch numpy (you can check by 
doing ldd on the file numpy/core/_dotblas.so inside your numpy installation.

cheers,

David