Re: Plotting with 3.2.0 on Windows is SLOOOOOOWWWW

[Tatsuro MATSUOKA]

Hello

--- "John W. Eaton"  wrote:

> On 29-Jul-2009, Tatsuro MATSUOKA wrote:
> 
> | MMMMM It is really slow as you pointed out
> 
> Is it any faster if you make the following change?  This way,
> communication with gnuplot will be one-way, using popen instead of
> popen2.  However, some features will be disabled (anything that
> requires getting information back from the gnuplot subprocess will
> likely fail).  If you can determine that using popen2 is the cause of
> the performance problem, then maybe the function that needs to be
> fixed is octave_popen2 in liboctave/lo-sysdep.cc.  But I'm not a
> Windows expert, so I have no clue if that is correct, or if it is,
> what should be done, so someone else will have to work on this
> problem.
> 
> jwe
> 
> > diff --git a/scripts/plot/gnuplot_drawnow.m b/scripts/plot/gnuplot_drawnow.m
> --- a/scripts/plot/gnuplot_drawnow.m
> +++ b/scripts/plot/gnuplot_drawnow.m
> @@ -79,7 +79,7 @@
>      ##  Graphics terminal for display.
>      plot_stream = get (h, "__plot_stream__");
>      if (isempty (plot_stream))
> -      plot_stream = __gnuplot_open_stream__ (2, h);
> +      plot_stream = __gnuplot_open_stream__ (1, h);
>        new_stream = true;
>      else
>        new_stream = false;
> 
The above change gives errors;

error: __gnuplot_get_var__: Need mkfifo that is not implemented under Windows
error: called from:
error:   
C:\Programs\Octave\3.2.0_gcc-4.3.0\share\octave\3.2.0\m\plot\__gnuplot_get_var__.m
 at line
52, column 7
error:   
C:\Programs\Octave\3.2.0_gcc-4.3.0\share\octave\3.2.0\m\plot\__go_draw_axes__.m 
at line 39,
column 18
error: __gnuplot_get_var__: Need mkfifo that is not implemented under Windows
error: called from:
error:   
C:\Programs\Octave\3.2.0_gcc-4.3.0\share\octave\3.2.0\m\plot\__gnuplot_get_var__.m
 at line
52, column 7
error:   
C:\Programs\Octave\3.2.0_gcc-4.3.0\share\octave\3.2.0\m\plot\__go_draw_axes__.m 
at line 39,
column 18
error: __gnuplot_get_var__: Need mkfifo that is not implemented under Windows
error: called from:
error:   
C:\Programs\Octave\3.2.0_gcc-4.3.0\share\octave\3.2.0\m\plot\__gnuplot_get_var__.m
 at line
52, column 7
error:   
C:\Programs\Octave\3.2.0_gcc-4.3.0\share\octave\3.2.0\m\plot\__go_draw_axes__.m 
at line 39,
column 18
error: __gnuplot_get_var__: Need mkfifo that is not implemented under Windows
error: called from:
error:   
C:\Programs\Octave\3.2.0_gcc-4.3.0\share\octave\3.2.0\m\plot\__gnuplot_get_var__.m
 at line
52, column 7
error:   
C:\Programs\Octave\3.2.0_gcc-4.3.0\share\octave\3.2.0\m\plot\__go_draw_axes__.m 
at line 39,
column 18

About a year before I have tried to use cygwin's gnuplot for windows octave.  
In the case, the speed
of plot with drawnow in a for loop of gnuplot on cygwin is faster that that of 
gnuplot for windows.  I
suppose that some  optimizing treatments are carried out in the emulation layer 
of the posix pipe in
cygwin. 

However I have not carried out enough investigation on this matter.  I would 
like to think about this
issue for a while.  My idea at present is that it will be required to treat the 
code of octave_popen2
in liboctave/lo-sysdep.cc using the win32 pipe functions but not the posix 
compatible ones.

Anyway please give me a moment for this matter but I cannot assure that my 
trial will be successful.

Hi Matthias Brennwald 

Have to you use octave 3.2.0 on windows ?  At the moment it is better to use 
octave 3.0.5 on mingw 
unless you need to use new features on the octave 3.2.0. 

http://sourceforge.net/projects/octave/files/Octave_Windows%20-%20MinGW/Octave%203.0.5%20for%20Windows%20MinGW32%20Installer/Octave-3.0.5_i686-pc-mingw32_gcc-4.3.0_setup.exe


If you have to use octave 3.2.0, I recommend to try octave-3.2.0 on cygwin-1.7.

Please see the details at  
http://wiki.octave.org/wiki.pl?OctaveForWindows

Regards

Tatsuro  

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