Yade dependency libopenblas breaks octave

[xyzdragon]

When openblas is installed Octave quits with a segmentation fault when trying to invert matrices sized 10x10 or bigger.
Openblas is a dependency for libyade.
See also https://savannah.gnu.org/bugs/?45651

[Bruno Chareyre (bruno-chareyre)]

Thank you for reporting but this actually not a bug related to yade since the problem is between octave and openblas.
Bruno

[xyzdragon (xyzdragon)]

I reported it here, because OpenBLAS doesn't even seem to be necessary! (at least for the yade examples I have) Well I found this out after posting this bug, but anyway
I solve my problem by hardcopying the original BLAS files (in order to not make apt hiccup because of missing dependencies):
sudo cp /usr/lib/libblas/libblas.so.3 /usr/lib/libblas.so.3
sudo cp /usr/lib/liblapack/liblapack.so.3 /usr/lib/liblapack.so.3

[Bruno Chareyre (bruno-chareyre)]

OpenBLAS is an alternative of BLAS, as such it is not strictly necessary, you are right.
I guess the yade package could allow different variants, but it would be some more maintainance work.
There are so many incompatible combinations when it come to variants of blas+lapack+SuiteSparse+metis+eigen that we better don't play this game.
Note that if you compile you can disable the modules that need OpenBlas. If you need those modules (fluid coupling) then you also need openblas because it is MUCH faster.

I suspect your problem with octave may be fixed in recent versions already (you didn't tell us anything about your versions btw). Actually OpenBlas has benchmarks for octave [1], so...
Besides you can install concurrent versions of blas and set priority in order to have octave load another blas instead of openblas.
That's how I solved Numpy/openblas conflicts before (sudo update-alternatives --config libblas.so / ubuntu only maybe?).

Bruno

[1] https://github.com/xianyi/OpenBLAS/commit/8614057ea9d10a14d7986935150fc4fa78846cc6

[xyzdragon (xyzdragon)]

openblas 0.2.12-1
lapack 3.5.0-4
eigen 3.2.2-3
python-minieigen 0.41~dfsg~bzr51
Octave 3.8.2
Yade 1.12.0
Debian 8.1
(everything should be packages from the stable Debian repository + Yade repository: yade-dem.org/packages)

Thank your for your suggestions.