Strange computational time with fftn

[Marco Caliari]

Hi all,

anybody can explain me the strange peak in elapsed time I see in
computing fftn for dimension 100^3 with the default planner "estimate"?
Moreover, ml is twice as fast.
I attach the script and the result of the plot.
I'm on Linux Mint 19.3, octave 5.1.1 or 7.0.0, libfftw3 3.3.7

Thank you very much,

Marco

test_fftn.m
Description: Text Data

fftn.png
Description: PNG image