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Yeah, I tried an OpenCL FFT example, and it was very sensitive to a number of non-obvious hardware tuning parameters.

That actually turned me off OpenCL at the time. Are there any black boxish GPU-accelerated FFT implementations? I'd like a drop-in replacement for FFTW.

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I'm not sure how the API compares to FFTW, but if you're on Nvidia hardware the toolkit comes with the CUFFT library http://developer.nvidia.com/object/cuda_3_2_toolkit_rc.html which is tuned for their hardware.

I seem to recall needing to transfer the data to GPU memory and other things like that when I last used it, but that was prior to toolkit 2.0 IIRC.

Thanks. I also just found PyFFT, here: http://pypi.python.org/pypi/pyfft/0.3.1

I'll start with this and see how it goes.

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