[gdal-dev] Availability of Lanczos and cubicspline in gdaladdo
bea at ixsea.com
Tue Mar 31 01:52:36 EDT 2009
That sounds like bad news for my dreams ! :(
I was planning to make a try with IPP on some parts of GDAL (warping, geometry rasterization).
Did you make some profiling ? I would be interested to know the results !
> -----Message reçu-----
> De: Adam Nowacki <nowak at xpam.de>
> À: "gdal-dev at lists.osgeo.org >> Gdal-Dev" <gdal-dev at lists.osgeo.org>
> Date: 31/03/2009 00:06
> Objet: Re: [gdal-dev] Availability of Lanczos and cubicspline in gdaladdo
> Seth Price wrote:
> > I actually hope to be addressing performance in my GSoC project. I'm
> > interested in rewriting the GDAL resampling code to CUDA, so the graphics
> > card does the hard work. For example, instead of processing one pixel at a
> > time, the latest GeForce GTX 260 would be able to process 216. I'm hoping
> > for CUDA to be 50 to 100 times faster.
> > Make sure you're using GDAL 1.6 or later, I recently rewrote the regular
> > Lanczos/cubicspline warping code to be much faster.
> > ~Seth
> You can achieve pretty amazing speeds on the CPU alone. I have a SSE3
> (would be trivial to rewrite as plain old SSE, probably a bit slower)
> Lanczos sampler with 4x4 kernel that runs at ~70 000 000 samples per
> second with float data type on a 2.33GHz Intel Xeon E5410 (one thread).
> I was considering porting the sampler to GDAL but found that I would
> have to rewrite the whole warping code to get any useful speed boost,
> including heavily optimizing coordinate transformations.
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