CPU usage by call of C++ code through system() on Linux

[Andreas Stahel]

Dear Octave Users

Maybe one of you can give me a hint on how to make my Octave code run faster.
Within a good size program (run time 40 sec) the command system() is used to 
call a C++ code.
The C++ code uses pthreads.
While the code is running htop show approximately 40% of load by the kernel on each CPU 
and 60% "normal" (user space?).

When running the same code in Matlab only the "normal"load shows and very 
little kernel load on the CPUs.
The computation time by Matlab is also only 60% of the time consumed by Octave 
(5.2.0)
The system is an Ubuntu 20.04 on a AMD Ryzen 3950X.

Any hints on what is slowing Octave down?

With best regards

Andreas
--
Andreas Stahel
Mathematics, BFH-TI  E-Mail: Andreas.Stahel@[ANTI-SPAM]bfh.ch
Quellgasse 21        HuCE, Institute for Human Centered Engineering
CH-2502 Biel         WWW:   https://web.sha1.bfh.science
Switzerland          Phone: ++41 +32 32 16 258