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Re: Slow plotting (redraw due to legend?)

From: Jens.Wulf
Subject: Re: Slow plotting (redraw due to legend?)
Date: Fri, 11 Mar 2016 09:46:05 +0000

Hello and thanks for your tests.

Doug wrote:
> I tried all 3 and found about the same time.
Same as mine or same as Mike's?

> The OP is questioning the time for legend but that is only 1.5% of the time, 
> so any improvement would make practically no difference to the overall time.
No, it is not about the time that legend() itself uses, but about other facts:

 - those legend-calls seem to cause replotting (as seen in the profiling 
output, number
  of calls to "__line__", "cellfun" and "set" which make up more than 80% of 
the time)
  which makes execution time go up about three times. Execution time of 3.2.3 
does not
  vary in this regard, so I assume that no replotting takes place. Furthermore 
I added a counter
  to 3.2.3's line.m; it counts 16 calls no matter if there's a legend or not, 
just like 3.6.4 and 4.0.0
  without legend.
- although showing the same number of calls, 4.0.0 is significantly slower than 
  (confirmed by Mike whose numbers relate to mine)
- even without those redraws caused by "legend", I experience 4.0.0 to be 
several times
  slower than 3.2.3.

So in case my code is ok, I feel that there are two regressions: unnecessary 
replotting and general slowness.

Further details about my systems:

Ubuntu 14.04, octave 4.0.0 compiled from source, gnuplot 4.6 patchlevel 4:
0.82s with legend, boxoff, left
0.26s without legend
Number of calls just like in my first post
cat /proc/cpuinfo reports intel i5 M 560 @ 2.67GHz

win7, official octave 4.0.0 build including gnuplot 4.6 patchlevel 7
intel i5-3360M @ 2.80GHz

Mike, your numbers are some times smaller than mine, but generally show the 
same trend. Could you share details about your system?

Best regards,


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