--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/lib/benchmark.js	Fri Dec 21 16:36:24 2012 -0400
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * A simple benchmark module that can be loaded
+ * in order to time how many times a method executes
+ * in a fixed number of seconds
+ */
+
+var benchmark = function(method, timeInMillis, args) {
+    var hz,
+    period,
+    startTime = new Date,
+    runs = 0;
+    do {
+	method.apply(args);
+	runs++;
+	totalTime = new Date - startTime;
+    } while (totalTime < timeInMillis);
+    
+    // convert ms to seconds
+    totalTime /= 1000;
+    
+    // period → how long per operation
+    period = totalTime / runs;
+
+    // hz → the number of operations per second
+    hz = 1 / period;
+
+    return hz;
+};
+