Re: Plotting with 3.2.0 on Windows is SLOOOOOOWWWW

[Tatsuro MATSUOKA]

Hello

I have made a patch to lo-sysdep.cc at the end of file. For the example by 
Matthiaas Brennwldd

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

Time for plot is about 8 seconds and 2 second after that.
(CPU CeleronM 1.3GHz, XP home 512 MB Memory).
Before patch it took 5-7 minutes!!! Too slow.

However, is it reanable each child process created by octave_popen2 always has
ABOVE_NORMAL_PRIORITY_CLASS?   

The slowness at this time occurred because the octave-3.2.0 is heavy task for 1 
core system, which
share almost all cpu activities.  

I cannot judge this patch is appropriate so that I would like to heart the 
opinion by those who are
much experience and knowledge for the windows programing.

Regards

Tatsuro 



**************************
--- a/liboctave/lo-sysdep.cc    2009-05-25 15:04:58 +0900
+++ b/liboctave/lo-sysdep.cc    2009-08-01 15:48:55 +0900
@@ -159,6 +159,7 @@
       msg = "popen2: process creation failed";
       return -1;
     }
+  SetPriorityClass(pi.hProcess, ABOVE_NORMAL_PRIORITY_CLASS);
   pid = pi.dwProcessId;
 
   CloseHandle (childRead);




--------------------------------------
Power up the Internet with Yahoo! Toolbar.
http://pr.mail.yahoo.co.jp/toolbar/