[SciPy-User] numpy.histogram is slow

David Warde-Farley wardefar@iro.umontreal...
Fri Oct 19 15:43:19 CDT 2012

On Thu, Oct 18, 2012 at 4:06 PM, Chris Weisiger <cweisiger@msg.ucsf.edu> wrote:
> On Thu, Oct 18, 2012 at 12:26 AM, Jerome Kieffer <Jerome.Kieffer@esrf.fr> wrote:
>> I implemented a 1D and 2D histogram, weighted and unweighted using cython (>=0.17) in parallel.
>> It is much faster than the one provided by numpy:
>> 4ms vs 25ms in your case on my computer
>> https://github.com/kif/pyFAI/blob/master/src/histogram.pyx
> Interesting. Is there any particular reason why this code could not be
> integrated into Numpy itself? A factor-of-6 improvement in speed on
> multi-processor machines is significant.

I don't know if we have the build infrastructure to support OpenMP
robustly across platforms in NumPy yet. That said, it is something I'd
like to see eventually.


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