Basis for the PFFFT benchmarks are here: https://github.com/hayguen/pffft.
This separate pffft_benchmarks git-repository has the purpose of keeping the sources small.
The benchmark shows the performance of various fft implementations measured in MFlops, with the number of floating point operations being defined as 5Nlog2(N) for a length N complex fft, and 2.5*Nlog2(N) for a real fft. See here for an explanation of these formulas.
Actual results have additional duration, relative to pffft's ordered duration.
On Linux systems, you can execute the shell script bench_all.sh to
generate all benchmarks on one platform. If available it also generates the gnuplot
figures and creates the archive pffft_bench_${HOSTNAME}.tar.gz including
the generated .csv tables and also the .png plot files.
bench_all.sh accepts command line options: first optional argument
is ON or OFF to switch usage of FFTW. Other arguments are forwarded
into a text file, which is added to the archive file.
On ARM platform one has to activate NEON support explicitly inside the
bench_all.sh file.
See *.md files in this directory.