Re: [Numpy-discussion] svd + multiprocessing hangs

On 12.06.2013 18:07, Uwe Schmitt wrote:

Dear all,

the following code hangs on my Ubuntu machine. I use self compiled numpy 1.7.1 and Python 2.7.3

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import numpy import numpy.linalg import multiprocessing

def classify(): X = numpy.random.random((10,3)) print "before svd" numpy.linalg.svd(X) print "this message is not printed"

if __name__ == "__main__": p = multiprocessing.Process(target=classify, args=()) p.start() p.join()

I'm guessing you are using openblas? check with: ls -l /etc/alternatives/libblas.so.3 there are known hanging problems with openblas and multiprocessing. you can work around them by disabling threading in openblas (OPENBLAS_NUM_THREADS=1).