The MKL 2D fft's don't seem that fast for non-powers of 2. They aren'tfaster than fftw 3.0 . The benchmark results displayed on the MKL web page are for the itanium processor. Does anyone have experience with the 32 bit or EM64T processors?
Also, is there a way of determining what the preferred non-power of 2 lengths for the MKL ffts are?
Doing non-power of 2 lengths are crucial for ffts. If I have a fft that is 20% slower, but can do length 140, or 145, that is much better than having to go up to length 256.