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Offline flipperke

Junior Member





« Posted 2007-09-25 13:04:13 »

Can somebody tell me if that is normal?
If I execute the following code
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import javax.swing.*;


public class TimerTest {

   public static void main (String args[]) {
      SwingUtilities.invokeLater(new Runnable(){
         public void run(){
            new TimerTest();
         }
      });
   }

   public TimerTest(){
      long startTime = System.currentTimeMillis();
      System.out.println(startTime);

      try{
         Thread.sleep(20);
      }
      catch(Exception e){}
      long endTime = System.currentTimeMillis();
      System.out.println(endTime);

      System.out.println("difference= "+(endTime-startTime));
   }
}


I get something like:
1190718128803
1190718128827
difference= 24

So the Thread is sleeping for 24ms (always more or less between 23 and 27). I have a dual core processor and I've heard that nanoTimer gives difficulties with dual-core.
Offline Rick

Junior Member


Projects: 1


Java games rock!


« Reply #1 - Posted 2007-09-25 16:52:44 »

You could try moving the System.out.println(startTime) to after the endTime = statement, as the way you have it coded you are measuring the print time as well as the sleep time.

Offline brackeen

Junior Member





« Reply #2 - Posted 2007-09-25 18:00:17 »

System.currentTimeMillis() doesn't have a good granularity on Windows, so use System.nanoTime(). The dual-core issue actually depends on where the OS gets it's timing info - see here: http://support.microsoft.com/kb/895980

Also, the sleep() function isn't too accurate on Windows, but see a workaround here: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6435126

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Offline flipperke

Junior Member





« Reply #3 - Posted 2007-09-25 19:14:19 »

Thanks for the answers,
but still...
I'm using Linux, and if I use nanoTimer(), I have the same result .
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