Timer.java

package ij.plugin;
import java.awt.*;
import ij.*;

public class Timer implements PlugIn {
    int j=0;
    long startTime, nullLoopTime;
    int numLoops;


    public void run(String arg) {
        int j=0, k;
        int[] a = new int[10];
        long endTime;

        /*
        startTime = System.currentTimeMillis();
        //for (int i=0; i<100; i++) IJ.wait(10);
        for (int i=0; i<100; i++) Thread.yield();
        long elapsedTime = System.currentTimeMillis() - startTime;
        IJ.write(elapsedTime + " ms");
        */
                
        numLoops = 10000;
        do {
            numLoops = (int)(numLoops*1.33);
            startTime = System.currentTimeMillis();
            for (int i=0; i<numLoops; i++) {}
            nullLoopTime = System.currentTimeMillis() - startTime;
            //IJ.write("loops=" + numLoops + ",  nullLoopTime=" + nullLoopTime);
        } while (nullLoopTime<250);

        IJ.write("");
        IJ.write("Timer: " + numLoops + " iterations (" + nullLoopTime + "ms)");
        Timer2 o = new Timer2();

        // null loop
        startTime = System.currentTimeMillis();
        for (int i=0; i<numLoops; i++) {}
        showTime("null loop");

        // i = o.getJ()
        startTime = System.currentTimeMillis();
        for (int i=0; i<numLoops; i++) {k = o.getJ();}
        showTime("i=o.getJ()");

        // i = o.getJFinal()
        startTime = System.currentTimeMillis();
        for (int i=0; i<numLoops; i++) {k = o.getJFinal();}
        showTime("i=o.getJ() (final)");

        // i = o.getJClass()
        startTime = System.currentTimeMillis();
        for (int i=0; i<numLoops; i++) {k = o.getJClass();}
        showTime("i=o.getJ() (static)");

        // i=o.j
        startTime = System.currentTimeMillis();
        for (int i=0; i<numLoops; i++) {k = o.j;}
        showTime("i=o.j");

        // i=o.jStatic
        startTime = System.currentTimeMillis();
        for (int i=0; i<numLoops; i++) {k = Timer2.k;}
        showTime("i=o.j (static)");

        // i=j
        startTime = System.currentTimeMillis();
        for (int i=0; i<numLoops; i++) {k = j;}
        showTime("i=j");

        // i=a[j]
        startTime = System.currentTimeMillis();
        for (int i=0; i<numLoops; i++) {k = a[j];}
        showTime("i=a[j]");

        /*
        long startTime = System.currentTimeMillis();
        for (int i=0; i<=numLoops; i++) {
            IJ.wait(51);
            if (i%50 == 0 )
            IJ.showProgress(i/(double)numLoops);
        }
        long endTime = System.currentTimeMillis();
        IJ.write("  showProgress(): " + (endTime - startTime) + "msecs");

        startTime = System.currentTimeMillis();
        for (int i=0; i<=numLoops; i++) {
            long time = System.currentTimeMillis();
        }
        endTime = System.currentTimeMillis();
        IJ.write("  System.currentTimeMillis(): " + (endTime - startTime) + "msecs");
        */
    }


    void showTime(String s) {
        long elapsedTime = System.currentTimeMillis() - startTime - nullLoopTime;
        IJ.write("  " + s + ": " + (elapsedTime*1000000)/numLoops + " ns");
    }
    
    
    /*
    void test() {
        //IJ.showMessage("Available for testing");
        //timer();
        //barTest();

        new Main();
    }

    void memoryTest() {
        int i=0;
        MemTest foo=null;
        try {
            while (true) {
                foo=new MemTest(foo,100000);
                i++;
            }
        } catch (OutOfMemoryError e) {
            IJ.log("out of memory at "+i);
        }
    }
    */

}


    class Timer2 {
        int j=0;
        static int k=0;

        public int getJ() {return j;}
        public final int getJFinal() {return j;}
        public static int getJClass() {return k;}
    }


/*
class MemTest{
    MemTest last; //to keep last one from being garbage collected
    byte[] buf;

    public MemTest(MemTest last, int size) {
        this.last=last;
        buf=new byte[size];
    }
}


class Main extends Frame {
    Main() {
        super("Dialog Example");
        add("West", new Button("Modal"));
        add("East", new Button("Modeless"));
        pack();
        show();
    }
    
    public boolean action(Event evt, Object what) {
        if ("Modal".equals(what)) {
            new MainDialog(this, true);
            return true;
        } else if ("Modeless".equals(what)) {
            new MainDialog(this, false);
            return true;
        }
        return false;
    }

    static public void main(String[] args) {
        new Main();
    }
}


class MainDialog extends Dialog {
    // These two integers hold the location of the last window.
    // New windows are created at an offset to the previous one.
    static int offsetX, offsetY;

    MainDialog(Frame frame, boolean modal) {
        super(frame, modal);
        setTitle(isModal() ? "Modal" : "Modeless");
        add("Center", new Button("Quit"));
        offsetX += 20;
        offsetY += 20;
        setLocation(offsetX, offsetY);
        pack();
        show();
    }

    public boolean action(Event evt, Object what) {
        if ("Quit".equals(what)) {
            dispose();
            return true;
        }
        return false;
    }
}
*/