[IPython-dev] Numpy with OpenBLAS vs. IPython

Florian M. Wagner wagnerfl at student.ethz.ch
Tue Oct 29 12:19:01 EDT 2013


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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