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Re: vDSP, anyone using it?


On Oct 30, 2004, at 3:53 PM, in a great fig-tree growing wrote:

I don't know much about FFTW, but I do know that Apple provides an
incredibly fast FFT library called "vDSP."

I went looking for vDSP and I found a nice pdf:
'vDSP_Library.pdf', but that's all. no other references.

seems odd if it's as fast and good as it's made out to be.

...so, is anyone using it?

I'm using it for one thing, a simple means calculating a real-valued FFT (I guess technically that would be real->complex but then I take the norm of the resulting complex numbers so that's pretty much real->real) . Since I'm just playing, though, performance is not a critical issue for me.

Apple showed some very nice performance numbers for vDSP and the rest of the Accelerate framework at WWDC. Naturally the compared a G5 to a similarly configured PC running a similar library from Intel (I think it was Intel's library but I'm open to connrection). At any rate, the G5 outperformed the PC library, as you might expect, in all the tests save one. (IIRC, that test was computing the natural log on a large collection of numbers).

If you are looking for more information on vDSP and how to use it to best effect, I might suggest the PerfOptimization-dev list or Sci-vis list both hosted at lists.apple.com

Scott

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 >vDSP, anyone using it? (From: in a great fig-tree growing <email@hidden>)



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