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import java.text.DecimalFormat;
import com.vladium.utils.timing.ITimer;
import com.vladium.utils.timing.TimerFactory;
// ----------------------------------------------------------------------------
/**
* A demo class to show off the higher resolution available from HRTimer class
* and to investigate the resolution offered by Java "time-related"
* methods other than System.currentTimeMillis().<P>
*
* Make sure that hrtlib.dll JNI lib is in java.library.path or TimerFactory
* will fall back to the Java system timer:
* <PRE>
* >java -Djava.library.path=(dir containing hrtlib.dll) HRTimerResolution
* </PRE>
*
* @author (C) <a href="mailto:vroubtsov@illinoisalumni.org">Vlad Roubtsov</a>, 2002
*/
public class HRTimerResolution
{
// public: ................................................................
public static void main (final String [] args) throws Exception
{
final DecimalFormat format = new DecimalFormat ();
format.setMinimumFractionDigits (3);
format.setMaximumFractionDigits (3);
// create an ITimer using the Factory class:
final ITimer timer = TimerFactory.newTimer ();
// JIT/hotspot warmup:
for (int i = 0; i < 3000; ++ i)
{
timer.start ();
timer.stop ();
timer.getDuration ();
timer.reset ();
}
final Object lock = new Object (); // this is used by monitor.wait() below
for (int i = 0; i < 5; ++ i)
{
timer.start ();
// uncomment various lines below to see the resolution
// offered by other Java time-related methods; with all
// lines commented out this loop reports time elapsed
// between successive calls to t.start() and t.stop(), thus
// providing an estimate for timer's raw resolution
synchronized (lock) { lock.wait (1); }
//Thread.currentThread ().sleep (1);
//Thread.currentThread ().sleep (0, 500);
//Thread.currentThread ().join (1);
timer.stop ();
System.out.println ("duration = "
+ format.format (timer.getDuration ()) + " ms");
timer.reset ();
}
}
} // end of class
// ----------------------------------------------------------------------------
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