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