Index: benchmark/mutex/JavaThread.java
===================================================================
--- benchmark/mutex/JavaThread.java	(revision dc33b5b1d92624f41baf064633127a4075fec592)
+++ benchmark/mutex/JavaThread.java	(revision c6f1f3ebf65fd583f3f052ae0aed817e4ce7f4fc)
@@ -1,14 +1,56 @@
 public class JavaThread {
-	public synchronized void noop() {}
+	// Simplistic low-quality Marsaglia Shift-XOR pseudo-random number generator.
+	// Bijective   
+	// Cycle length for non-zero values is 4G-1.
+	// 0 is absorbing and should be avoided -- fixed point.
+	// The returned value is typically masked to produce a positive value.
+	static volatile int Ticket = 0 ; 
 
-	public static void main(String[] args) {
-		int NoOfTimes = 5000000;
+	private static int nextRandom (int x) {
+		if (x == 0) { 
+			// reseed the PRNG
+			// Ticket is accessed infrequently and does not constitute a coherence hot-spot. 
+			// Note that we use a non-atomic racy increment -- the race is rare and benign. 
+			// If the race is a concern switch to an AtomicInteger.  
+			// In addition accesses to the RW volatile global "Ticket"  variable are not 
+			// (readily) predictable at compile-time so the JIT will not be able to elide 
+			// nextRandom() invocations.  
+			x = ++Ticket ; 
+			if (x == 0) x = 1 ; 
+		}
+		x ^= x << 6;
+		x ^= x >>> 21;
+		x ^= x << 7;
+		return x ;   
+	}
+	static int x = 2;
+
+	static private final int NoOfTimes = Integer.parseInt("100000000") ;
+
+	public synchronized void noop() {
+		x = nextRandom( x );
+	}
+	public static void helper() throws InterruptedException {
 		JavaThread j = new JavaThread();
-		long start = System.nanoTime();
+		// Inhibit biased locking ...
+		x = (j.hashCode() ^ System.identityHashCode(j)) | 1 ;     
 		for(int i = 1; i <= NoOfTimes; i += 1) {
+			x = nextRandom(x);
 			j.noop();
 		}
+	}
+	public static void InnerMain() throws InterruptedException {
+		long start = System.nanoTime();
+		helper();
 		long end = System.nanoTime();
-		System.out.println( (end - start) / NoOfTimes);
+		System.out.println( (end - start) / NoOfTimes );
+	}
+	public static void main(String[] args) throws InterruptedException {
+		for (int n = Integer.parseInt("5"); --n >= 0 ; ) { 
+			InnerMain();
+			Thread.sleep(2000);     // 2 seconds
+			x = nextRandom(x);
+		}
+		if ( x == 0 ) System.out.println(x);
 	}
 }