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

[N]

> 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.

Operations on vectors may be much faster than loops. I have function reading a 
file, it executed slowly in Octave but as functions to read file are very 
similar to C I reimplemented and then it became much faster.

> 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.

Matlab is more expensive so I guess you get something for the money but it does 
not need to stay like this forever, you could figure out where the difference 
is?


Nicklas Karlsson