benchmark.js revision 6:5a1b0714df0e 
1/*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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22 */
23
24/**
25 * A simple benchmark module that can be loaded
26 * in order to time how many times a method executes
27 * in a fixed number of seconds
28 */
29
30var benchmark = function(method, timeInMillis, args) {
31    var hz,
32    period,
33    startTime = new Date,
34    runs = 0;
35    do {
36	method.apply(args);
37	runs++;
38	totalTime = new Date - startTime;
39    } while (totalTime < timeInMillis);
40
41    // convert ms to seconds
42    totalTime /= 1000;
43
44    // period ��� how long per operation
45    period = totalTime / runs;
46
47    // hz ��� the number of operations per second
48    hz = 1 / period;
49
50    return hz;
51};
52
53