[Numpy-discussion] numpy arrays, data allocation and SIMD alignement
Stefan van der Walt
stefan at sun.ac.za
Thu Aug 9 05:40:23 EDT 2007
On Thu, Aug 09, 2007 at 04:52:38PM +0900, David Cournapeau wrote:
> Charles R Harris wrote:
> > Well, what you want might be very easy to do in python, we just need
> > to check the default alignments for doubles and floats for some of the
> > other compilers, architectures, and OS's out there. On the other hand,
> > you might not be able to request a c malloc that is aligned in a
> > portable way without resorting to the same tricks as you do in python.
> > So why not use python and get the reference counting and garbage
> > collection along with it?
> First, doing it in python means that I cannot use the facility from C
> easily. But this is exactly where I need it, and where I would guess
> most people need it. People want to interface numpy with the mkl ? They
> will do it in C, right ?
It doesn't really matter where the memory allocation occurs, does it?
As far as I understand, the underlying fftw function has some flag to
indicate when the data is aligned. If so, we could expose that flag
in Python, and do something like
x = align16(data)
I am not intimately familiar with the fft wrappers, so maybe I'm
missing something more fundamental.
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