RE: Plotting with 3.2.0 on Windows is SLOOOOOOWWWW

[Tatsuro MATSUOKA]

Hello

Great!!
As you pointed out, your modification solves the slowness problem of the 
gnuplot of octave 3.2.0 for
windows on one core cpu.!!

Hello  Matthias Brennwald

please edit by notepad++
Octave\3.2.0_gcc-4.3.0\share\octave\3.2.0\m\plot\__gnuplot_get_var__.m

 *** 125,135 ****
         fflush (ostream);
 
        str = {};
        while (isempty (str))
          str = char (fread (istream)');
!         if (! isempty (str))
            str = regexp (str, "OCTAVE:.*", "match");
            str = str{end}(8:end);
          endif
          fclear (istream);
        endwhile

***********
          if (! isempty (str))
  |
  |
  V
          if ( isempty (str)) // do not forget delete '!'
            sleep(0.05);
          else

This made the first plot about 6 second and second plot about 2 seconds.
This modification can be done easily by notepad++ and you can no longer feel 
angry for slooooow plots.


Regards

Tatsuro
 
--- Tatsuro MATSUOKA <address@hidden> wrote:

> Sorry again 
> 
>         if (isempty (str))
> #          sleep(0.05);
> 
> Then 
> N = 100;
> n = 2;
> m = 2;
> ts=cputime()
> for i = 1:n*m
>     x = rand (2,N);
>     subplot (n,m,i);
>     plot (x(1,:),x(2,:)); 
> end
> cputime()-ts
> 
> gives
> about 2 seconds
> 
> 
>         if (isempty (str))
>           sleep(0.05);
> The same test gives 
> 0.8 seconds
> 
> Anyway further test should be done one core computer and I will do it at home.
> 
> Regards
> 
> Tatsuro
> --- Tatsuro MATSUOKA wrote:
> 
> > Sorry
> > 
> > I have manually change the code
> > and 
> > > > !         if (isempty (str))
> > Is forgotten.
> > 
> > octave.exe:11>for i = 1:n*m
> > >     x = rand (2,N);
> > >     subplot (n,m,i);
> > >     plot (x(1,:),x(2,:));
> > > end
> > octave.exe:12>cputime()-ts
> > ans =  0.76563
> > octave.exe:13>
> > octave.exe:13>N = 100;
> > octave.exe:14>n = 2;
> > octave.exe:15>m = 2;
> > octave.exe:16>tic
> > octave.exe:17>for i = 1:n*m
> > >     x = rand (2,N);
> > >     subplot (n,m,i);
> > >     plot (x(1,:),x(2,:));
> > > end
> > octave.exe:18>toc
> > Elapsed time is 3.2813 seconds.
> > 
> > cputime is surely reduced on the computer in my university (cpu is 
> > HT-pentium).
> > 
> > I will test again at home.
> > 
> > Regards
> > 
> > Tatsuro 
> > I will check again at home
> > 
> > Regards.
> > 
> > 
> > --- Tatsuro MATSUOKA wrote:
> > 
> > > Hello
> > > 
> > > --- Olli Saarela  wrote:
> > > 
> > > > I was looking for a CPU consuming loop in the C++ code, but there might
> > > > actually be some in the script files. Does this help?
> > > > 
> > > > *** __gnuplot_get_var__.m~      Tue Jun  9 23:22:14 2009
> > > > --- __gnuplot_get_var__.m       Mon Aug  3 13:52:35 2009
> > > > ***************
> > > > *** 125,135 ****
> > > >         fflush (ostream);
> > > > 
> > > >         str = {};
> > > >         while (isempty (str))
> > > >           str = char (fread (istream)');
> > > > !         if (! isempty (str))
> > > >             str = regexp (str, "OCTAVE:.*", "match");
> > > >             str = str{end}(8:end);
> > > >           endif
> > > >           fclear (istream);
> > > >         endwhile
> > > > --- 125,137 ----
> > > >         fflush (ostream);
> > > > 
> > > >         str = {};
> > > >         while (isempty (str))
> > > >           str = char (fread (istream)');
> > > > !         if (isempty (str))
> > > > !           sleep(0.05);
> > > > !         else
> > > >             str = regexp (str, "OCTAVE:.*", "match");
> > > >             str = str{end}(8:end);
> > > >           endif
> > > >           fclear (istream);
> > > >         endwhile
> > > > 
> > > > 
> > > > On my multicore machine the tic-toc timing is practically the same, but
> > > > cputime() shows a significant speed-up.
> > > > 
> > > 
> > > First 
> > > > !         if (isempty (str))
> > > > !           sleep(0.05);
> > > > !         else
> > > 
> > > I have tested on computer in my home (cpu Celerron M 1.3GHz)
> > > Why 'else' is here? 
> > > With this 'else' plot was failled.
> > > 
> > > I remove 'else' and tested argument of sleep from 0.05 to 1 with task 
> > > manager active.
> > > Octave consumed 99% cpu time while loop of this test. 
> > > N = 100;
> > > n = 2;
> > > m = 2;
> > > tic
> > > for i = 1:n*m
> > >     x = rand (2,N);
> > >     subplot (n,m,i);
> > >     plot (x(1,:),x(2,:)); 
> > > end
> > > toc
> > > 
> > > 
> > > Regards
> > > 
> > > Tatsuro
> > > 
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> > 
> > 
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> 
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