Just for fun I tried to run my Octave code on a GPD Pocket. It's a
small Intel Atom-based computer. The code execution time (~7 minutes)
was almost the same as it was on the (much faster) Blackbird!
It probably means that something in the GNU Octave on the ppc64le is
not as optimised as it should be.
I tried to compute the same problem in a native program (written in C
and compiled o both computers) and the Blackbird was MUCH faster, as it
should be (0.4s vs 2.3s).
Of course, programs like the Octave are for learning, prototyping and
testing, not for real-life computing.