topic MKL 2D fft's vs. FFTW? in Intel® oneAPI Math Kernel Library https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-2D-fft-s-vs-FFTW/m-p/967589#M16329 <DIV>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? </DIV> <DIV></DIV> <DIV>Also, is there a way of determining what the preferred non-power of 2 lengths for the MKL ffts are? </DIV> <DIV></DIV> <DIV>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. </DIV> Sat, 22 Oct 2005 03:03:42 GMT c-stork 2005-10-22T03:03:42Z MKL 2D fft's vs. FFTW? https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-2D-fft-s-vs-FFTW/m-p/967589#M16329 <DIV>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? </DIV> <DIV></DIV> <DIV>Also, is there a way of determining what the preferred non-power of 2 lengths for the MKL ffts are? </DIV> <DIV></DIV> <DIV>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. </DIV> Sat, 22 Oct 2005 03:03:42 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-2D-fft-s-vs-FFTW/m-p/967589#M16329 c-stork 2005-10-22T03:03:42Z Re: MKL 2D fft's vs. FFTW? https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-2D-fft-s-vs-FFTW/m-p/967590#M16330 <DIV>I am not certain which version of MKL you are using. In MKL 8.0 we added radix 7 and 11 kernels. We have had radix 2, 3, and 5. One of your transforms - 140 - should profit from the radix 7 transform. The second transform - 145 - should be zero-filled to size 150.</DIV> <DIV></DIV> <DIV>Bruce</DIV> Tue, 01 Nov 2005 14:51:14 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-2D-fft-s-vs-FFTW/m-p/967590#M16330 Intel_C_Intel 2005-11-01T14:51:14Z