[Octave-bug-tracker] [bug #52809] interpreter performance is slow on development branch

[Rik]

Follow-up Comment #22, bug #52809 (project octave):

Yes, move this to a new bug report.

For reference, I used these two loops while testing performance

bm_for_loop.m


a = 1; b = 1; t0=cputime; for i=1:1000; for j=1:1000; a = a + b + 123.0; end;
end; t1=cputime; t1 - t0


bm_for_loop2.m


a = 1; b = 1; t0=tic; for i=1:1000; for j=1:1000; a = a + b + 123.0; end; end;
t1=toc(t0); t1


The first one uses cputime, the second uses wall time.

Results:


octave:1> bm_for_loop
ans =  4.6840
octave:2> bm_for_loop
ans =  4.6640
octave:3> bm_for_loop
ans =  4.6240
octave:4> bm_for_loop2
t1 =  4.4830
octave:5> bm_for_loop2
t1 =  4.5830
octave:6> bm_for_loop2
t1 =  4.4962


As you can see, wall time was less than cputime which doesn't make sense to
me, but maybe that is my misunderstanding.



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