jlaskey@3: /*
jlaskey@7:  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
jlaskey@3:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jlaskey@3:  * 
jlaskey@3:  * This code is free software; you can redistribute it and/or modify it
jlaskey@3:  * under the terms of the GNU General Public License version 2 only, as
jlaskey@3:  * published by the Free Software Foundation.
jlaskey@3:  * 
jlaskey@3:  * This code is distributed in the hope that it will be useful, but WITHOUT
jlaskey@3:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jlaskey@3:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jlaskey@3:  * version 2 for more details (a copy is included in the LICENSE file that
jlaskey@3:  * accompanied this code).
jlaskey@3:  * 
jlaskey@3:  * You should have received a copy of the GNU General Public License version
jlaskey@3:  * 2 along with this work; if not, write to the Free Software Foundation,
jlaskey@3:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jlaskey@3:  * 
jlaskey@3:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jlaskey@3:  * or visit www.oracle.com if you need additional information or have any
jlaskey@3:  * questions.
jlaskey@3:  */
jlaskey@3: 
jlaskey@3: /**
jlaskey@3:  * A simple benchmark module that can be loaded
jlaskey@3:  * in order to time how many times a method executes
jlaskey@3:  * in a fixed number of seconds
jlaskey@3:  */
jlaskey@3: 
jlaskey@3: var benchmark = function(method, timeInMillis, args) {
jlaskey@3:     var hz,
jlaskey@3:     period,
jlaskey@3:     startTime = new Date,
jlaskey@3:     runs = 0;
jlaskey@3:     do {
jlaskey@3: 	method.apply(args);
jlaskey@3: 	runs++;
jlaskey@3: 	totalTime = new Date - startTime;
jlaskey@3:     } while (totalTime < timeInMillis);
jlaskey@3:     
jlaskey@3:     // convert ms to seconds
jlaskey@3:     totalTime /= 1000;
jlaskey@3:     
jlaskey@3:     // period → how long per operation
jlaskey@3:     period = totalTime / runs;
jlaskey@3: 
jlaskey@3:     // hz → the number of operations per second
jlaskey@3:     hz = 1 / period;
jlaskey@3: 
jlaskey@3:     return hz;
jlaskey@3: };
jlaskey@3: