[pypy-dev] rpython numpy

[David Cournapeau]

Simon Burton wrote:
> I've been having some fun working on a (tiny) rpython version of numpy.
That's great, this is really one of the most interesting part of pypy 
for me.
>
>
> The above mentioned "efficient code" is perhaps a non-issue. Numpy
> code tends to become memory-bound, not cpu-bound.
I tend to agree, at least from my limited observation and hacking on 
numpy: some (quite fundamental) operations are not cache friendly at 
all. But I thought this was what rpython + pypy could improve quite a 
lot, actually. For example, one problem with numpy, specially with 
broadcasting and the ufunc machinery, is to decide on which dimension to 
compute for maximum performances.  See for example 
http://www.mail-archive.com/numpy-discussion@scipy.org/msg03759.html.

David