Hi all, I have managed to compile numpy using pathscale and ACML on a 64 bit AMD system. Now I wanted to verify that numpy.dot indeed uses the ACML libs. The example for dot() (http://www.scipy.org/Numpy_Example_List?highlight=%28example%29#head-c7a573f...) suggest a way of doing this: 1 u0050015@lo-03-02 .../core $ python -c "import numpy; print id(numpy.dot)==id(numpy.core.multiarray.dot);" True This indicates that I am not using the acml libraries. When running a benchmark (see attach) and comparing to a non-ACML installation though, the strange thing is that there is a clear speed difference, suggesting again that the acml libraries are indeed used. Because this is not all that clear to me, I was wondering whether there exists an alternative way of verifying what libraries are used. Many thanks, YVES