[Numpy-discussion] numpy can't use ACML

Piotr Luszczek luszczek at cs.utk.edu
Sat Jan 28 18:04:04 CST 2006


On Saturday 28 January 2006 19:36, George Nurser wrote:
> I'm sure this is well known, but I just realized that numpy cannot
> use the _dotblas.so that it makes when it is compiled with ACML.
> This is because ACML only has the fortran blas libraries, not cblas.
>
> numpy will find the acml libraries and use them to make a _dotblas.so
> without complaining, if you have
>
> [blas]
> blas_libs = acml
> language = f77
>   in your site.cfg.
>
> But attempting to import this _dotblas.so gives errors .... so numpy
> never actually uses it.
>
>  >>> import _dotblas.so
>
> Traceback (most recent call last):
>    File "<stdin>", line 1, in ?
> ImportError: ./_dotblas.so: undefined symbol: cblas_zaxpy
>
> nm _dotblas.so gives a whole stream of undefined cblas_xxxx symbols.
>
> So what are the options? Forget about ACML? Find an optimized cblas
> for numpy _dotblas but use the ACML flapack for scipy? Persuade
> somebody to write a scipy-style ?f2py interface to generate
> _dotblas.so using the fblas?
>
> George Nurser.


There is code for that on netlib:
http://www.netlib.org/blas/blast-forum/cblas.tgz

I used it myself for my C code before and it worked just fine.

Piotr




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