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

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?61647>

                 Summary: Plot performance tic/toc misleading result
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 09 Dec 2021 10:04:37 AM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 6.3.0
         Discussion Lock: Any
        Operating System: Microsoft Windows

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Details:

Please run the following commands:


a=rand(1,100000);
b=rand(1,100000);
figure
tic;plot(a,b,'.');toc


It shows for example:

Elapsed time is 1 seconds.

But it is wrong! It takes about 4 seconds for  plot to complete its task. CPU
usage in Task manager shows that. It seems that It takes 1 second for Octave
to create the required data structures to pass to the rendering backend and it
returns immediately. Rendering then takes 3 seconds.
So if there is a program to improve plot performance please go forward and
don't rely on tic/toc misleading results.
Thanks!
 




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