class ThreadTestB {
	static int s;

    public static void main(String[] args) {
        int numberofthreads = 100, numberofloops   = 800;
        double		min = 2000000000, max =0, speedup, timeused;
        long timestart, timeend, timeavg = 0;

        System.out.println("Starting " + numberofthreads + " threads" +
                         "Looping " + numberofloops + " times");

        for (int i = 0; i < numberofloops; i++) {
            timestart = System.nanoTime();

            Thread[] t = new Thread[numberofthreads];

            for (int j = 0; j < numberofthreads; j++) {
                (t[j] = new Thread(new ExThread())).start();
            }
            try{
				for (int k = 0;k< numberofthreads;k++) t[k].join();
			}catch (Exception e) { return;}

            //System.out.println("Finished " + numberofthreads + " threads");
            timeend = System.nanoTime();
			timeused = ((timeend - timestart)/(1000.0*numberofthreads));

			if (min > timeused) min = timeused;
			if (max < timeused) max = timeused;
            timeavg += timeused;
            System.out.println("Loop #" + (i+1) + " : " + ((timeend - timestart)/(1000.0*numberofthreads) )+ " us");
        }
        timeavg = (timeavg / numberofloops);
        System.out.println("\nAverage time: " + timeavg + " us, max:"+max+", min:"+min+", speedup:"+ (max/min));
    }
}
	class ExThread implements Runnable {
		public void run() {
			String name = Thread.currentThread().getName();
			try {
                    ThreadTestB.s++;
			}catch (Exception e) { return;}
		}
	}