Hi
> The other big one is the FFT code; always shows up near the top of profiles.
> But there are quite a few high performance FFT implementations around (e.g.
> FFTW) that we haven't tried yet.
>
> -- Mat.
I replaced the FFT module with the one from libfftw (librfftw to be exact) and noticed
reasonable overall performance improvement on a Compaq SP700 (dual Xeon @ 450MHz) and
a Compaq DS20 (dual 21264/EV6 @ 500MHz) running Linux kernel v2.2.13. However, I also
notice the output imaginary as well the energy terms from the original FFT function do
*NOT* match that of FFTW function. This conclusion was drawn after running a test
program using both FFT routines with a known input vector (1024 term Gaussian signal).
I also used the MATLAB result as reference. Did anyone notice this discrepancy? I'd be
happy to post my test program if there is interest to reproduce the aforementioned
finding.
- King Chow
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