[Numpy-tickets] [NumPy] #667: _dotblas.so only built if ATLAS is installed

NumPy numpy-tickets@scipy....
Sun Feb 24 05:02:39 CST 2008


#667: _dotblas.so only built if ATLAS is installed
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 Reporter:  otizonaizit  |        Owner:  somebody
     Type:  defect       |       Status:  new     
 Priority:  high         |    Milestone:  1.0.5   
Component:  numpy.core   |      Version:  none    
 Severity:  critical     |   Resolution:          
 Keywords:               |  
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Comment (by cdavid):

 Several things to note:
  - dotblas cannot be compiled with BLAS, since it uses the CBLAS, not
 BLAS. So it is well intented not to build dotblas when only BLAS/LAPACK is
 found, and not ATLAS (or other supported CBLAS). I don't know what happens
 before the fix in r3854, but it is simply impossible that it worked if
 only BLAS/LAPACK was available.
  - no dotblas will not make numpy really slow; AFAIK, only one function is
 affected, numpy.dot. It will certainly no make numpy unusable: if it is
 unusable, please give us an example, because it is likely to be something
 else.
  - Linked to the above: netlib BLAS/LAPACK (the ones in lapack-dev blas-
 dev deb packages) are slow, and is likely to be the cause of the slowness
 of numpy for some operations.

 IOW: the solution is to fix atlas package, and use the atlas package.

-- 
Ticket URL: <http://scipy.org/scipy/numpy/ticket/667#comment:1>
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