On Thu, Jan 28, 2010 at 3:11 PM, David Cournapeau <da...@silveregg.co.jp> wrote: > Jankins wrote: >> Yes. I am using scipy.sparse.linalg.eigen.arpack. >> >> The exact output is: >> >> /usr/local/lib/python2.6/dist-packages/scipy/sparse/linalg/eigen/arpack/_arpack.so > > I need the output of ldd on this file, actually, i.e the output of "ldd > /usr/local/lib/python2.6/dist-packages/scipy/sparse/linalg/eigen/arpack/_arpack.so". > It should output the libraries actually loaded by the OS. > >> In fact, the matrix is from a directed graph with about 18,000 nodes and >> 41,000 edges. Actually, this matrix is the smallest one I used. > > Is it available somewhere ? 41000 edges should make the matrix very > sparse. I first thought that your problem may be some buggy ATLAS, but > the current arpack interface (the one used by sparse.linalg.eigen) is > also quite buggy in my experience, though I could not reproduce it. > Having a matrix which consistently reproduce the bug would be very useful.
Ok, I took a look at it, and unfortunately, it is indeed most likely an ATLAS problem. I get crashes when scipy is linked against Atlas (v3.8.3), but if I link against plain BLAS/LAPACK, I don't get any crash anymore (and valgrind does not complain). I will try with a recent development from atlas, cheers, David _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
