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[Octave-bug-tracker] [bug #52623] First plot command is very slow


From: Georg Wiora
Subject: [Octave-bug-tracker] [bug #52623] First plot command is very slow
Date: Fri, 8 Dec 2017 04:17:20 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0

URL:
  <http://savannah.gnu.org/bugs/?52623>

                 Summary: First plot command is very slow
                 Project: GNU Octave
            Submitted by: gwiora
            Submitted on: Fri 08 Dec 2017 10:17:19 AM CET
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: gwiora
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Microsoft Windows

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Details:

After starting octave the first plot command needs very long time to perform.
In my case I found times up to 23 seconds! Subsequent plots run very quickly.
I wrote a test script  and ran it as first script after starting octave GUI.
Here is my script (s. also attachment):


graphics_toolkit('qt');

nwin=5;

for i=1:nwin
  figure('name',sprintf('This is window %d',i));
  t1=tic();
  plot([0,1],[0,1]);
  tim(i) = toc(t1);
endfor

printf('Current graphics toolkit is "%s"\n',graphics_toolkit());
printf('Window %d opening time: %.4f s\n',[1:nwin;tim]);

pause(1)
close all



I found the following times when testing all available graphics toolkits:


Current graphics toolkit is "fltk"
Window 1 opening time: 15.6904 s
Window 2 opening time: 0.0924 s
Window 3 opening time: 0.0965 s
Window 4 opening time: 0.0965 s
Window 5 opening time: 0.0915 s



Current graphics toolkit is "qt"
Window 1 opening time: 15.5998 s
Window 2 opening time: 0.1478 s
Window 3 opening time: 0.1538 s
Window 4 opening time: 0.1089 s
Window 5 opening time: 0.1039 s



Current graphics toolkit is "gnuplot"
Window 1 opening time: 15.6902 s
Window 2 opening time: 0.1292 s
Window 3 opening time: 0.1552 s
Window 4 opening time: 0.1463 s
Window 5 opening time: 0.1393 s


After a restarting octave a couple of times for this test the time reduced
from 23 to 15 seconds.

After that test I added profiling on the plot function and got the following
results:


   #            Function Attr     Time (s)   Time (%)        Calls
------------------------------------------------------------------
  28         __go_axes__            15.682      96.65            5
  19                 get             0.166       1.02          140
  39    __go_axes_init__             0.148       0.91            5
  68            __line__             0.097       0.60            5
  75             cellfun             0.040       0.25           10
   6                plot             0.023       0.14            5


Obviously time is consumed in __go_axes__ function.
Is this problem reproducible or a specialty of my system? Thanks for any
confirmations.



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File Attachments:


-------------------------------------------------------
Date: Fri 08 Dec 2017 10:17:19 AM CET  Name: figuretimetest.m  Size: 652B  
By: gwiora
Test script to profile perfomance problem in first plot.
<http://savannah.gnu.org/bugs/download.php?file_id=42604>

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  <http://savannah.gnu.org/bugs/?52623>

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