[Octave-bug-tracker] [bug #61259] slow printing of images

[Dmitri A. Sergatskov]

Follow-up Comment #9, bug #61259 (project octave):

If you run top in a separate windows you would notice that most of the time is
being is being used by ghostscript (that converts postscript into either png
or pdf). With qt backend you can eliminate most of it if you add "-svgconvert"
parameter to print. 
With those mods I got the following results on my 13+ years old laptop (Intel
Core2 Duo CPU     T9900  @ 3.06GHz), octave 6.3.0
on Fedora 35:



octave:1> t_print
agt =
{
  [1,1] = qt
}


number of points is 100000

toolkit is qt
figure visibility is on
printing of png took 0.490375 seconds
printing of pdf took 3.254296 seconds
figure visibility is off
printing of png took 0.355418 seconds
printing of pdf took 3.050011 seconds

number of points is 1000000

toolkit is qt
figure visibility is on
printing of png took 0.579070 seconds
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 8.4E+06 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 1.7E+07 B
printing of pdf took 15.954510 seconds
figure visibility is off
printing of png took 0.472160 seconds
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 8.4E+06 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 1.7E+07 B
printing of pdf took 15.998050 seconds

number of points is 10000000

toolkit is qt
figure visibility is on
printing of png took 3.074761 seconds
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 8.4E+06 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 1.7E+07 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 3.4E+07 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 6.7E+07 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 1.3E+08 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 2.7E+08 B
printing of pdf took 93.645220 seconds
figure visibility is off
printing of png took 1.648946 seconds
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 8.4E+06 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 1.7E+07 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 3.4E+07 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 6.7E+07 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 1.3E+08 B
GL2PS info: OpenGL feedback buffer overflow
GL2PS info: OpenGL feedback buffer overflow
warning: gl2ps_renderer::draw: retrying with buffer size: 2.7E+08 B
printing of pdf took 91.062127 seconds
octave:2> 



Dmitri.
-- 


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