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
  21  * questions.
  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 
  30 var 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