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1 // Written in the D programming language
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2 // www.digitalmars.com/d/
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3
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4 /*
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5 * The contents of this file are subject to the Mozilla Public License Version
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6 * 1.1 (the "License"); you may not use this file except in compliance with
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7 * the License. You may obtain a copy of the License at
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8 * http://www.mozilla.org/MPL/
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9 *
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10 * Software distributed under the License is distributed on an "AS IS" basis,
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11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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12 * for the specific language governing rights and limitations under the
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13 * License.
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14 *
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15 * The Original Code is the Dynamin library.
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16 *
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17 * The Initial Developer of the Original Code is Jordan Miner.
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18 * Portions created by the Initial Developer are Copyright (C) 2006-2009
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19 * the Initial Developer. All Rights Reserved.
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20 *
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21 * Contributor(s):
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22 * Jordan Miner <jminer7@gmail.com>
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23 *
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24 */
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25
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26 module dynamin.core.benchmark;
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27
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28 import dynamin.all_core;
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29 import dynamin.core.string;
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30 import tango.io.Stdout;
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31
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32 /**
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33 * Returns: The average number of milliseconds one call of the specified
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34 * delegate took.
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35 */
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36 real benchmark(int repetitions, void delegate() dg) { // use static opCall()?
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37 long time = Environment.runningTime;
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38 for(int i = 0; i < repetitions; ++i)
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39 dg();
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40 return (Environment.runningTime-time)/cast(real)repetitions;
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41 }
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42 real benchmark(void delegate() dg) {
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43 return benchmark(1, dg);
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44 }
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45 /**
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46 * name can be null
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47 */
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48 real benchmarkAndWrite(string name, int repetitions, void delegate() dg) {
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49 real time = benchmark(repetitions, dg);
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50 Stdout.format("{} took {:.2}ms.", name, time).newline; // TODO: verify :.2
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51 return time;
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52 }
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53 real benchmarkAndWrite(string name, void delegate() dg) {
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54 return benchmarkAndWrite(name, 1, dg);
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55 }
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56
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57 /**
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58 * As the constructor calls the Start() method, the only time one would need
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59 * to is when reusing a Benchmark object.
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60 */
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61 class Benchmark {
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62 long _startTime;
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63 this() {
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64 start();
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65 }
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66 void start() {
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67 _startTime = Environment.runningTime;
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68 }
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69 long time() {
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70 return _startTime-Environment.runningTime;
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71 }
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72 void writeTime(string opName) {
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73 if(opName is null)
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74 opName = "Benchmark";
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75 Stdout.format("{} took {}ms.", opName, time).newline;
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76 }
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77
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78 /**
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79 * calls the specified delegate the specified number of times and
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80 * returns the average time one call took
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81 */
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82 static long measure(int times, void delegate() d) {
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83 long time = Environment.runningTime;
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84 for(int i = 0; i < times; ++i)
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85 d();
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86 return (Environment.runningTime-time)/times;
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87 }
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88 }
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