topic FFT Kernels in Intel® oneAPI Math Kernel Library

FFT Kernels

Lui_S_ — Fri, 08 May 2015 21:24:33 GMT

Hi everybody,

quick question:

https://software.intel.com/en-us/articles/fft-length-and-layout-advisor

states: "The Intel® MKL FFT implementation employs radix 2, 3, 4, 5, 7, 8, 11, 13, 16 kernels, and several other larger size kernels."

https://software.intel.com/en-us/articles/mkl-ipp-choosing-an-fft

states: "2,3,5,7,11 and 13 kernels (**) ** - Both libraries support arbitrary radix in optimized manner, that is O(N log N), but these specific radixes are better optimized than others.

So are only the radixes 2,3,5,7,11 and 13 optimized or 2, 3, 4, 5, 7, 8, 11, 13, 16 and several other? I do not find the answer to that anywhere. And before I start optimizing and get a suboptimal result (because I didn't know better) - I thought I'd ask.

Thanks!

Lui

FFT with radixes 2, 4, 8, 16

Gennady_F_Intel — Sat, 09 May 2015 09:17:22 GMT

FFT with radixes 2, 4, 8, 16 ..... (power of 2) are most well optimized for both of MKL and IPP libs ..

Thanks! This is really

Lui_S_ — Sun, 10 May 2015 10:54:30 GMT

Thanks! This is really helpful!

Is IPP generally faster than MKL on the same "task"? So if I can use IPP - should I use IPP versus MKL? I am talking about FFTs.

Have a nice weekend!

we expected the same

Gennady_F_Intel — Mon, 11 May 2015 05:22:59 GMT

we expected the same performance for IPP and MKL.

Thanks a lot! This was really

Lui_S_ — Tue, 12 May 2015 17:09:12 GMT

Thanks a lot! This was really helpful!