[AstroPy] TAN WCS speedup

[Kyle Barbary]

I'm curious if part of the speed up is due to using two cores in the
numexpr version? I assume the WCSLIB C code is not threaded.

- Kyle

On Thu, Nov 13, 2014 at 12:43 PM, Maik Riechert <maik.riechert at arcor.de>
wrote:

> Hi,
>
> I just finished implementing my own wcs_pix2world function specifically
> for the TAN projection using just Python with numpy and numexpr. Without
> numexpr I was slightly slower than astropy (15s vs 12.8s). But with
> numexpr I got it down to 6.8s, so nearly twice as fast. This is for 8
> million pixel coordinates as input run on my 2GHz Core 2 Duo Laptop
> under Python 2.7 64 bit with Windows 7 and using Christoph Gohlke's
> numpy and numexpr binaries.
>
> I cannot post the code yet but the code is not that important anyway as
> I didn't do really complicated things.
>
> As numexpr seems to provide the main speedup, maybe some concepts of it
> could be used to speedup astropy/wcslib. I guess it's not a sensible
> option to actually implement all of wcslib in Python, given that there
> are way more complicated projections etc. than TAN which would take
> quite some time to reimplement/maintain.
>
> This is basically it, just wanted to share that.
>
> Cheers
> Maik
> _______________________________________________
> AstroPy mailing list
> AstroPy at scipy.org
> http://mail.scipy.org/mailman/listinfo/astropy
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/astropy/attachments/20141113/b789c464/attachment.html>