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  Game loop eating 100% cpu  (Read 418 times)
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Offline luisoft

JGO Coder


Projects: 6


Java games rock!


« Posted 2013-01-04 03:21:31 »

This is the base game loop I'm using for a game for J4K 2013. But it is eating 100% of my CPU. I'm running on Ubuntu 32 bit and Java 6. Any tips how can I avoid eating 100% of CPU? Thanks!


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      int FPS = 60;
      int MILI_FRAME_LENGTH = 1000 / FPS;
      int frameCount = 0;

      while (true) {
         long startTime = System.currentTimeMillis();

         long lastLoopTime = System.currentTimeMillis();
         long lastFpsTime = 0;
         long fps = 0;
         while (true) {
            long delta = System.currentTimeMillis() - lastLoopTime;
            lastLoopTime = System.currentTimeMillis();
            lastFpsTime += delta;
            fps++;

            // If more than 1000ms (1s) has passed reset the fps count.
           if (lastFpsTime >= 1000) {
               lastFpsTime = 0;
               fps = 0;
            }

            logic(delta);
            render(g);

            frameCount++;
            while ((System.currentTimeMillis() - startTime)
                  / MILI_FRAME_LENGTH < frameCount) {
               Thread.yield();
            }

            // Ensures that the display is up-to-date. This keeps the
           // animation smoother for the Linux OS.
           Toolkit.getDefaultToolkit().sync();
         }
      }
Offline masteryoom

JGO Coder


Medals: 5
Projects: 3


If you look closely, you might see it turning...


« Reply #1 - Posted 2013-01-04 03:29:49 »

Thread.yield only temporarily pauses the the thread and allows others to run. Since you don't have another thread, it has no effect.
http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Thread.html

Smiley
GENERATION 9003:The first time you see this, copy it into your sig and add 1 to the generation. social experiment
Online HeroesGraveDev

JGO Wizard


Medals: 72
Projects: 8


Muahahahahahaha...


« Reply #2 - Posted 2013-01-04 03:56:57 »

Looks like you need to learn about game loops...

Here you go!

Games published by our own members! Check 'em out!
Play the free demo of Revenge of the Titans!
Offline luisoft

JGO Coder


Projects: 6


Java games rock!


« Reply #3 - Posted 2013-01-04 12:56:12 »

Thanks, I took this game loop from an older entry of the 4k competition but maybe I have modified it and removed the sleep statement. Thanks for pointing it out. Now my cpu rate is ok and my game still smooth.
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Play Revenge of the Titans! The situation is critical. We need fancy commanders to defend Earth, the moon, Mars!
 
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