[Numpy-discussion] Changing the distributed binary for numpy 1.0.4 for windows ?

Robert Kern robert.kern@gmail....
Mon Dec 10 17:41:31 CST 2007

David M. Cooke wrote:
> On Dec 10, 2007, at 10:30 , Matthieu Brucher wrote:
>> 2007/12/10, Alexander Michael <lxander.m@gmail.com>: On Dec 10, 2007  
>> 6:48 AM, David Cournapeau <david@ar.media.kyoto-u.ac.jp> wrote:
>>> Hi,
>>>     Several people reported problems with numpy 1.0.4 (See #627 and
>>> #628, but also other problems mentionned on the ML, which I cannot
>>> find). They were all solved, as far as I know, by a binary I  
>> produced
>>> (simply using mingw + netlib BLAS/LAPACK,  no ATLAS). Maybe it  
>> would be
>>> good to use those instead ? (I can recompile them if there is a  
>> special
>>> thing to do to build them)
>> Do I understand correctly that you are suggesting removing ATLAS from
>> the Windows distribution? Wouldn't this make numpy very slow? I know
>> on RHEL5 I see a very large improvement between the basic BLAS/LAPACK
>> and ATLAS. Perhaps we should make an alternative Windows binary
>> available without ATLAS just for those having problems with ATLAS?
>> That's why David proposed the netlib version of BLAS/LAPACK and not  
>> the default implementation in numpy.
>> I would agree with David ;)
> Our versions of BLAS/LAPACK are f2c'd versions of the netlib 3.0 BLAS/ 
> LAPACK (actually, of Debian's version of these -- they include several  
> fixes that weren't upstream).
> So netlib's versions aren't going to be any faster, really. And  
> netlib's BLAS is slow. Now, if there is a BLAS that's easier to  
> compile than ATLAS on windows, that'd be improvement.

The current situation is untenable. I will gladly accept a slow BLAS for an
official binary that won't segfault anywhere. We can look for a faster BLAS later.

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco

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