[Octave-bug-tracker] [bug #63646] Long creation times for sparseimages.m in manual due to -svgconvert option to print

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?63646>

                 Summary: Long creation times for sparseimages.m in manual due
to -svgconvert option to print
                 Project: GNU Octave
               Submitter: rik5
               Submitted: Thu 12 Jan 2023 09:39:47 PM PST
                Category: Performance
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: stable
         Discussion Lock: Any
        Operating System: Any
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


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Date: Thu 12 Jan 2023 09:39:47 PM PST By: Rik <rik5>
Creation time for "spchol" image in the Octave manual has become very long.

The code to generate the image runs quite quickly (0.3 seconds on my PC).


    n = 200;
    a = 10*speye (n) + sparse (1:n,ceil ([1:n]/2),1,n,n) + ...
        sparse (ceil ([1:n]/2),1:n,1,n,n);
    r1 = chol (a);
    spy (r1);
    axis ("ij");


However, the print command is quite slow


octave:9> tic; print -nosvgconvert -depsc2 blah.eps; toc
Elapsed time is 1.0838 seconds.
octave:10> tic; print -svgconvert -depsc2 blah2.eps; toc
Elapsed time is 54.0847 seconds.


If there is no obvious way to improve efficiency of the -svgconvert option
then I think it should be disabled for generation of this particular figure. 
This would not be hard as there is already a special test for eps output which
sets an option to the print command.







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