[Numpy-discussion] NEP for faster ufuncs
faltet at pytables.org
Wed Dec 22 03:54:16 EST 2010
A Wednesday 22 December 2010 09:48:03 Mark Wiebe escrigué:
> On Wed, Dec 22, 2010 at 12:21 AM, Francesc Alted
<faltet at pytables.org>wrote:
> > <snip>
> > Wow, really nice work! It would be great if that could make into
> > NumPy
> > :-) Regarding your comment on numexpr being faster, I'm not sure
> > :(your
> > new_iterator branch does not work for me; it gives me an error
> > like: AttributeError: 'module' object has no attribute 'newiter'),
> What are you using to build it? So far I've just modified the
> setup.py scripts, I still need to add it to numscons.
Well, just the typical "git clone ...; python setup.py install" dance.
> > i.e. numexpr is not able to achieve the 2x speedup mark that you
> > are getting with ``luf`` (using a Core2 @ 3 GHz here).
> That's promising! I based my assertion on getting a slower speedup
> than numexpr does on their front page example.
I see :-) Well, I'd think that numexpr is not specially efficient when
handling broadcasting, so this might be the reason your approach is
faster. I suppose that with operands with the same shape, things might
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