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  Interesting performance tip...  (Read 1378 times)
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Offline crystalsquid

Junior Devvie




... Boing ...


« Posted 2003-12-04 13:20:26 »

This code takes about 8 seconds (Java 1.4):

 
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  canvas = new Canvas();
  canvas.setBackground(new Color(0, 0, 0));
  canvas.setBounds(0, 0, 640, 480);
  applet.add("Center", canvas);  // <- BIG STALL HERE
  


This code takes <1 sec:

 
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  canvas = new Canvas();
  applet.add("Center", canvas);  // <- No stall here
  canvas.setBackground(new Color(0, 0, 0));
  canvas.setBounds(0, 0, 640, 480);
  


Bizarre...
Moral of the story: Add the canvas straight after you build it.

- Dom

modified - I forgot to change the 2nd code snippet - Oops!  Embarrassed
Offline blahblahblahh

JGO Coder


Medals: 1


http://t-machine.org


« Reply #1 - Posted 2003-12-04 13:43:21 »

Quote
This code takes about 8 seconds (Java 1.4):

 
1  
2  
3  
4  
5  
  canvas = new Canvas();
  canvas.setBackground(new Color(0, 0, 0));
  canvas.setBounds(0, 0, 640, 480);
  applet.add("Center", canvas);  // <- BIG STALL HERE
 


This code takes <1 sec:

 
1  
2  
3  
4  
5  
  canvas = new Canvas();  // <- No stall here
  canvas.setBackground(new Color(0, 0, 0));
  canvas.setBounds(0, 0, 640, 480);
  applet.add("Center", canvas);
 


Bizarre...


Yeah; what's the difference, exactly?

Anyway, I have an outstanding bug on loading and starting of applets in 1.4.x where sometimes applets can crash on startup - and never get to display anything - under linux. I narrowed it down to a race condition somewhere in Sun's code. It's been accepted but not yet fixed. Who knows how much more screwed code there is in applet startup ? Smiley

malloc will be first against the wall when the revolution comes...
Offline Jeff

JGO Coder




Got any cats?


« Reply #2 - Posted 2003-12-11 05:34:07 »

Quote


Yeah; what's the difference, exactly?


Hmm I dunno but you AIR take your  life  into your hands modifying live AWt components as it is not thread-safe...

Got a question about Java and game programming?  Just new to the Java Game Development Community?  Try my FAQ.  Its likely you'll learn something!

http://wiki.java.net/bin/view/Games/JeffFAQ
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