[IPython-dev] Numpy with OpenBLAS vs. IPython

[Julian Taylor]

does this also happen if you do this before starting ipython?

export OPENBLAS_NUM_THREADS=1
(assuming bash shell)

On 29.10.2013 17:19, Florian M. Wagner wrote:
> Dear all,
> 
> I recently compiled numpy with OpenBlas for faster matrix-matrix
> multiplication. Everything works fine, but IPython seems to dislike it.
> I get a Segmentation Fault error when trying this (I reinstalled IPython
> 1.1.0 after numpy compilation):
> 
>     fwagner at fwagner-notebook ~ $ ipython -c "import numpy as np; print
>     np.__version__; import IPython; print IPython.__version__; A =
>     np.random.randn(600, 600); print A[20,53]; print A"
>     /usr/local/bin/ipython:5: UserWarning: Module dap was already
>     imported from None, but /usr/lib/python2.7/dist-packages is being
>     added to sys.path
>       from pkg_resources import load_entry_point
>     1.9.0.dev-54d3559
>     1.1.0
>     -2.1004055886
>     Speicherzugriffsfehler
> 
> In comparison, this works fine (just python instead of ipython):
> 
>     fwagner at fwagner-notebook ~ $ python -c "import numpy as np; print
>     np.__version__; import IPython; print IPython.__version__; A =
>     np.random.randn(600, 600); print A[20,53]; print A"
>     1.9.0.dev-54d3559
>     1.1.0
>     -1.10282239744
>     [[ 0.13798084 -0.39195796 -0.15309986 ...,  1.47471232 -0.9158455
>        0.97060671]
>      [ 0.25720169  0.51895478  0.55175787 ..., -0.02010573  0.78047754
>       -1.07891961]
>      [ 1.59478156  0.81245486 -0.03959768 ..., -0.04816659 -0.03356907
>       -0.11860379]
>      ...,
>      [-0.06299817 -0.0956477  -0.32987518 ..., -1.47714386  1.66736916
>       -0.47704276]
>      [-0.93769589  1.50006542  0.97782803 ..., -0.5034154   1.31592011
>       -0.74482995]
>      [-0.24661336 -0.98979706 -0.39366363 ...,  0.20507632  0.8701609
>       -1.10449957]]
> 
> Any ideas what might cause this problem?
> 
> Thanks,
> 
> Florian
> 
> 
> 
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