On Apr 26, 6:14 am, Francois Bissey:
> Actually do we know what version of
> ATLAS/BLAS/LAPACK is shipped with OSX?
Here are a few excerpts from the sage install log file
/Applications/sage-4.7.alpha5/install.log
on my mac.
ATLAS=atlas-3.8.3.p16
LAPACK=lapack-20071123.p2
BLAS=blas-20070724
(time to move to more recent versions?)
> I know there are some instabilities depending on hardware with
> some ATLAS-3.9.xx releases. There is some numerical noise and
> some errors that we have tracked down to it in sage-on-gentoo.
>
> I have been contacted off-list for details but didn't realise it was not
> on the list. If you could repost instruction here for all to see it would
> be good. In fact I wonder if we should switch lapack off in numpy
> by default. It is not necessary for numpy to work and it triggers the
> occasional issue.
François's instructions to build numpy without lapack were:
* unpack the numpy spkg (tar xvfj numpy-1.5.1.spkg)
* edit spkg-install, add:
export LAPACK=none
between the two lines:
unset CFLAGS
python setup.py install ${NUMPY_FCONFIG}
* repack numpy with sage.
* reinstall using sage -i
see also Rob's post on trac.
Samuel
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