--- jsr166/src/test/loops/FutileTimedTryLockLoops.java	2014/12/31 17:00:58	1.2
+++ jsr166/src/test/loops/FutileTimedTryLockLoops.java	2016/12/31 22:17:40	1.6
@@ -4,9 +4,12 @@
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-import java.util.*;
-import java.util.concurrent.*;
-import java.util.concurrent.locks.*;
+import java.util.Collections;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.ReentrantLock;
 
 /**
  * Measures repeated futile timed attempts to acquire a ReentrantLock.
@@ -51,7 +54,7 @@ public final class FutileTimedTryLockLoo
                     continue nextArg;
                 }
             }
-            throw new Error("Usage: FutileTimedTryLockLoops minThreads=n maxThreads=n Threads=n nanos=n iters=n");
+            throw new Error("Usage: FutileTimedTryLockLoops minThreads=n maxThreads=n threads=n nanos=n iters=n");
         }
         final ExecutorService pool = Executors.newCachedThreadPool();
         final ReentrantLock lock = new ReentrantLock();
@@ -59,6 +62,10 @@ public final class FutileTimedTryLockLoo
         lock.lock();
 
         for (int i = minThreads; i <= maxThreads; i += (i+1) >>> 1) {
+            // warmup
+            if (i == minThreads)
+                pool.invokeAll(Collections.nCopies(i, task));
+
             long startTime = System.nanoTime();
             pool.invokeAll(Collections.nCopies(i, task));
             long elapsed = System.nanoTime() - startTime;