[ET Trac] [Einstein Toolkit] #1674: Switch to OpenBLAS

[Einstein Toolkit]

#1674: Switch to OpenBLAS
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  Reporter:  eschnett     |       Owner:                     
      Type:  enhancement  |      Status:  review             
  Priority:  major        |   Milestone:                     
 Component:  Other        |     Version:  development version
Resolution:               |    Keywords:                     
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Comment (by knarf):

 The current state with BLAS and LAPACK is that a user does not have to do
 anything to get these pickup MKL/Atlas - two pretty optimized libraries.
 For production machines the simfactory entries would handle that this
 happens anyway (one would hope), but this also happens for typical
 workstation environments. I don't think that we should change this.

 Also, this is not what we do for any other external library. The task of
 the ExternalLibraries thorns was so far always to check for the existence
 of a viable system version first, and use this if at all possible. Of
 course, the point for discussion here is 'viable'. If we understand this
 as "works", then performance is none of the thorns concerns. If
 performance is important, we have to detect poor performance somehow.
 Ignoring an installed blas/lapack library is not what I would expect.
 ExternalLibraries/MPI also checks for other MPI versions than OpenMPI, and
 does not care whether the found version has better or worse performance
 than a built OpenMPI would have.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1674#comment:8>
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