[Octave-bug-tracker] [bug #61647] Plot performance tic/toc misleading result

[anonymous]

Follow-up Comment #2, bug #61647 (project octave):

Not only resizing the figure leads to re-rendering but moving the figure or
minimizing and maximizing(without size change) causes re-rendering on qt
toolkit (maybe subject of another issue?) . 
I also used the following command:

tic;plot(a, b, '.');drawnow;toc


Now fltk waits until the rendering is finished and, to my opinion, shows the
correct timing  but gnuplot and qt don't wait for rendering. Actually the
command window is frozen while rendering but the timing doesn't include
rendering process.

Using clf:


tic;plot(a, b, '.');clf;toc


Nothing is drawn (according to CPU usage). In this case the last command is
executed.

Using drawnow+clf:


tic;plot(a, b, '.');drawnow;clf;toc


Voila! It prints correct timings for both qt and fltk.

All of the above timings as noted in comment #1 my be the expected behavior
but I have seen in several bug reports that the performance of plot is
measured by tic/toc.

Using [tic + plot + drawnow + clf + toc] wonderfully shows that on my computer
fltk is more performant than qt (at least in plotting points)!

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