FFTW

Intel MKL

We recommend using the Intel MKL implementation of FFTW. To use MKL implementation of FFTW, first load the corresponding module and, second, export the following path to correct include folder (build systems like CMake should pick up the path automatically). You can load either the complete Intel OneAPI (module intel/oneapi-all), or just MKL like this:

module load intel/oneapi mkl
export CPATH=$MKLROOT/include/fftw:$CPATH