1 | /* -*- C++ -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library |
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4 | * |
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5 | * Copyright (C) 2003-2006 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | #ifndef LEMON_TIME_MEASURE_H |
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20 | #define LEMON_TIME_MEASURE_H |
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21 | |
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22 | ///\ingroup timecount |
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23 | ///\file |
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24 | ///\brief Tools for measuring cpu usage |
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25 | |
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26 | |
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27 | #ifdef WIN32 |
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28 | |
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29 | #include <windows.h> |
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30 | #include <time.h> |
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31 | #include "dos.h" |
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32 | |
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33 | int gettimeofday(struct timeval * tp, struct timezone *) { |
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34 | SYSTEMTIME systime; |
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35 | |
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36 | if (tp) { |
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37 | |
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38 | struct tm tmrec; |
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39 | time_t theTime = time(NULL); |
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40 | |
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41 | tmrec = *localtime(&theTime); |
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42 | tp->tv_sec = mktime(&tmrec); |
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43 | GetLocalTime(&systime); /* system time */ |
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44 | |
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45 | tp->tv_usec = systime.wMilliseconds * 1000; |
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46 | |
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47 | } |
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48 | |
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49 | return 0; |
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50 | |
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51 | } |
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52 | |
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53 | struct tms { |
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54 | long tms_utime; |
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55 | long tms_stime; |
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56 | long tms_cutime; |
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57 | long tms_cstime; |
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58 | }; |
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59 | |
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60 | static long filetime_to_clock(FILETIME *ft) |
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61 | { |
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62 | __int64 qw = ft->dwHighDateTime; |
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63 | qw <<= 32; |
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64 | qw |= ft->dwLowDateTime; |
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65 | qw /= 10000; /* File time ticks at 0.1uS, clock at 1mS */ |
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66 | return (long) qw; |
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67 | |
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68 | } |
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69 | |
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70 | int times(struct tms *tmbuf) |
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71 | { |
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72 | FILETIME create, exit, kernel, user; |
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73 | if (GetProcessTimes(GetCurrentProcess(),&create, &exit, &kernel, &user)) { |
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74 | tmbuf->tms_utime = filetime_to_clock(&user); |
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75 | tmbuf->tms_stime = filetime_to_clock(&kernel); |
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76 | tmbuf->tms_cutime = 0; |
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77 | tmbuf->tms_cstime = 0; |
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78 | } |
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79 | else { |
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80 | tmbuf->tms_utime = clock(); |
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81 | tmbuf->tms_stime = 0; |
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82 | tmbuf->tms_cutime = 0; |
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83 | tmbuf->tms_cstime = 0; |
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84 | } |
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85 | return 0; |
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86 | } |
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87 | |
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88 | #define _SC_CLK_TCK 1 |
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89 | |
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90 | int sysconf(int) |
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91 | { |
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92 | return 1; |
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93 | } |
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94 | |
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95 | #else |
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96 | #include <sys/times.h> |
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97 | #endif |
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98 | |
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99 | #include <sys/time.h> |
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100 | #include <fstream> |
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101 | #include <iostream> |
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102 | #include <unistd.h> |
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103 | |
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104 | namespace lemon { |
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105 | |
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106 | /// \addtogroup timecount |
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107 | /// @{ |
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108 | |
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109 | /// A class to store (cpu)time instances. |
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110 | |
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111 | /// This class stores five time values. |
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112 | /// - a real time |
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113 | /// - a user cpu time |
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114 | /// - a system cpu time |
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115 | /// - a user cpu time of children |
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116 | /// - a system cpu time of children |
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117 | /// |
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118 | /// TimeStamp's can be added to or substracted from each other and |
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119 | /// they can be pushed to a stream. |
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120 | /// |
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121 | /// In most cases, perhaps the \ref Timer or the \ref TimeReport |
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122 | /// class is what you want to use instead. |
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123 | /// |
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124 | ///\author Alpar Juttner |
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125 | |
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126 | class TimeStamp |
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127 | { |
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128 | struct rtms |
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129 | { |
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130 | double tms_utime; |
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131 | double tms_stime; |
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132 | double tms_cutime; |
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133 | double tms_cstime; |
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134 | rtms() {} |
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135 | rtms(tms ts) : tms_utime(ts.tms_utime), tms_stime(ts.tms_stime), |
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136 | tms_cutime(ts.tms_cutime), tms_cstime(ts.tms_cstime) {} |
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137 | }; |
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138 | rtms ts; |
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139 | double real_time; |
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140 | |
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141 | rtms &getTms() {return ts;} |
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142 | const rtms &getTms() const {return ts;} |
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143 | |
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144 | void _reset() |
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145 | { ts.tms_utime=ts.tms_stime=ts.tms_cutime=ts.tms_cstime=0; real_time=0;} |
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146 | |
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147 | public: |
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148 | |
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149 | ///Read the current time values of the process |
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150 | void stamp() |
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151 | { |
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152 | timeval tv; |
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153 | tms _ts; |
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154 | times(&_ts); |
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155 | gettimeofday(&tv, 0);real_time=tv.tv_sec+double(tv.tv_usec)/1e6; |
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156 | ts=_ts; |
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157 | } |
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158 | |
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159 | /// Constructor initializing with zero |
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160 | TimeStamp() |
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161 | { _reset(); } |
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162 | ///Constructor initializing with the current time values of the process |
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163 | TimeStamp(void *) { stamp();} |
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164 | |
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165 | ///Set every time value to zero |
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166 | TimeStamp &reset() {_reset();return *this;} |
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167 | |
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168 | ///\e |
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169 | TimeStamp &operator+=(const TimeStamp &b) |
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170 | { |
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171 | ts.tms_utime+=b.ts.tms_utime; |
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172 | ts.tms_stime+=b.ts.tms_stime; |
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173 | ts.tms_cutime+=b.ts.tms_cutime; |
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174 | ts.tms_cstime+=b.ts.tms_cstime; |
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175 | real_time+=b.real_time; |
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176 | return *this; |
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177 | } |
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178 | ///\e |
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179 | TimeStamp operator+(const TimeStamp &b) const |
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180 | { |
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181 | TimeStamp t(*this); |
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182 | return t+=b; |
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183 | } |
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184 | ///\e |
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185 | TimeStamp &operator-=(const TimeStamp &b) |
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186 | { |
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187 | ts.tms_utime-=b.ts.tms_utime; |
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188 | ts.tms_stime-=b.ts.tms_stime; |
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189 | ts.tms_cutime-=b.ts.tms_cutime; |
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190 | ts.tms_cstime-=b.ts.tms_cstime; |
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191 | real_time-=b.real_time; |
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192 | return *this; |
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193 | } |
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194 | ///\e |
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195 | TimeStamp operator-(const TimeStamp &b) const |
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196 | { |
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197 | TimeStamp t(*this); |
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198 | return t-=b; |
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199 | } |
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200 | ///\e |
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201 | TimeStamp &operator*=(double b) |
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202 | { |
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203 | ts.tms_utime*=b; |
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204 | ts.tms_stime*=b; |
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205 | ts.tms_cutime*=b; |
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206 | ts.tms_cstime*=b; |
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207 | real_time*=b; |
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208 | return *this; |
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209 | } |
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210 | ///\e |
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211 | TimeStamp operator*(double b) const |
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212 | { |
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213 | TimeStamp t(*this); |
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214 | return t*=b; |
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215 | } |
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216 | friend TimeStamp operator*(double b,const TimeStamp &t); |
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217 | ///\e |
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218 | TimeStamp &operator/=(double b) |
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219 | { |
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220 | ts.tms_utime/=b; |
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221 | ts.tms_stime/=b; |
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222 | ts.tms_cutime/=b; |
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223 | ts.tms_cstime/=b; |
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224 | real_time/=b; |
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225 | return *this; |
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226 | } |
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227 | ///\e |
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228 | TimeStamp operator/(double b) const |
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229 | { |
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230 | TimeStamp t(*this); |
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231 | return t/=b; |
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232 | } |
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233 | ///The time ellapsed since the last call of stamp() |
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234 | TimeStamp ellapsed() const |
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235 | { |
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236 | TimeStamp t(NULL); |
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237 | return t-*this; |
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238 | } |
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239 | |
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240 | friend std::ostream& operator<<(std::ostream& os,const TimeStamp &t); |
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241 | |
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242 | ///Gives back the user time of the process |
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243 | double userTime() const |
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244 | { |
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245 | return double(ts.tms_utime)/sysconf(_SC_CLK_TCK); |
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246 | } |
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247 | ///Gives back the system time of the process |
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248 | double systemTime() const |
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249 | { |
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250 | return double(ts.tms_stime)/sysconf(_SC_CLK_TCK); |
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251 | } |
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252 | ///Gives back the user time of the process' children |
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253 | double cUserTime() const |
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254 | { |
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255 | return double(ts.tms_cutime)/sysconf(_SC_CLK_TCK); |
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256 | } |
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257 | ///Gives back the user time of the process' children |
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258 | double cSystemTime() const |
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259 | { |
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260 | return double(ts.tms_cstime)/sysconf(_SC_CLK_TCK); |
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261 | } |
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262 | ///Gives back the real time |
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263 | double realTime() const {return real_time;} |
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264 | }; |
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265 | |
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266 | TimeStamp operator*(double b,const TimeStamp &t) |
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267 | { |
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268 | return t*b; |
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269 | } |
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270 | |
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271 | ///Prints the time counters |
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272 | |
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273 | ///Prints the time counters in the following form: |
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274 | /// |
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275 | /// <tt>u: XX.XXs s: XX.XXs cu: XX.XXs cs: XX.XXs real: XX.XXs</tt> |
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276 | /// |
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277 | /// where the values are the |
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278 | /// \li \c u: user cpu time, |
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279 | /// \li \c s: system cpu time, |
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280 | /// \li \c cu: user cpu time of children, |
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281 | /// \li \c cs: system cpu time of children, |
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282 | /// \li \c real: real time. |
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283 | /// \relates TimeStamp |
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284 | inline std::ostream& operator<<(std::ostream& os,const TimeStamp &t) |
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285 | { |
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286 | long cls = sysconf(_SC_CLK_TCK); |
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287 | os << "u: " << double(t.getTms().tms_utime)/cls << |
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288 | "s, s: " << double(t.getTms().tms_stime)/cls << |
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289 | "s, cu: " << double(t.getTms().tms_cutime)/cls << |
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290 | "s, cs: " << double(t.getTms().tms_cstime)/cls << |
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291 | "s, real: " << t.realTime() << "s"; |
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292 | return os; |
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293 | } |
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294 | |
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295 | ///Class for measuring the cpu time and real time usage of the process |
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296 | |
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297 | ///Class for measuring the cpu time and real time usage of the process. |
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298 | ///It is quite easy-to-use, here is a short example. |
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299 | ///\code |
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300 | ///#include<lemon/time_measure.h> |
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301 | ///#include<iostream> |
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302 | /// |
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303 | ///int main() |
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304 | ///{ |
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305 | /// |
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306 | /// ... |
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307 | /// |
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308 | /// Timer T; |
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309 | /// doSomething(); |
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310 | /// std::cout << T << '\n'; |
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311 | /// T.restart(); |
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312 | /// doSomethingElse(); |
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313 | /// std::cout << T << '\n'; |
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314 | /// |
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315 | /// ... |
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316 | /// |
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317 | ///} |
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318 | ///\endcode |
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319 | /// |
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320 | ///The \ref Timer can also be \ref stop() "stopped" and |
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321 | ///\ref start() "started" again, so it is possible to compute collected |
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322 | ///running times. |
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323 | /// |
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324 | ///\warning Depending on the operation system and its actual configuration |
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325 | ///the time counters have a certain (10ms on a typical Linux system) |
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326 | ///granularity. |
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327 | ///Therefore this tool is not appropriate to measure very short times. |
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328 | ///Also, if you start and stop the timer very frequently, it could lead |
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329 | ///distorted results. |
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330 | /// |
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331 | ///\note If you want to measure the running time of the execution of a certain |
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332 | ///function, consider the usage of \ref TimeReport instead. |
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333 | /// |
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334 | ///\todo This shouldn't be Unix (Linux) specific. |
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335 | ///\sa TimeReport |
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336 | /// |
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337 | ///\author Alpar Juttner |
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338 | class Timer |
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339 | { |
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340 | int _running; //Timer is running iff _running>0; (_running>=0 always holds) |
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341 | TimeStamp start_time; //This is the relativ start-time if the timer |
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342 | //is _running, the collected _running time otherwise. |
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343 | |
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344 | void _reset() {if(_running) start_time.stamp(); else start_time.reset();} |
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345 | |
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346 | public: |
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347 | ///Constructor. |
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348 | |
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349 | ///\param run indicates whether or not the timer starts immediately. |
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350 | /// |
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351 | Timer(bool run=true) :_running(run) {_reset();} |
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352 | |
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353 | ///\name Control the state of the timer |
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354 | ///Basically a Timer can be either running or stopped, |
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355 | ///but it provides a bit finer control on the execution. |
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356 | ///The \ref Timer also counts the number of \ref start() |
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357 | ///executions, and is stops only after the same amount (or more) |
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358 | ///\ref stop() "stop()"s. This can be useful e.g. to compute the running time |
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359 | ///of recursive functions. |
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360 | /// |
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361 | |
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362 | ///@{ |
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363 | |
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364 | ///Reset and stop the time counters |
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365 | |
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366 | ///This function resets and stops the time counters |
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367 | ///\sa restart() |
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368 | void reset() |
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369 | { |
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370 | _running=0; |
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371 | _reset(); |
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372 | } |
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373 | |
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374 | ///Start the time counters |
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375 | |
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376 | ///This function starts the time counters. |
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377 | /// |
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378 | ///If the timer is started more than ones, it will remain running |
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379 | ///until the same amount of \ref stop() is called. |
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380 | ///\sa stop() |
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381 | void start() |
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382 | { |
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383 | if(_running) _running++; |
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384 | else { |
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385 | _running=1; |
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386 | TimeStamp t; |
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387 | t.stamp(); |
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388 | start_time=t-start_time; |
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389 | } |
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390 | } |
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391 | |
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392 | |
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393 | ///Stop the time counters |
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394 | |
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395 | ///This function stops the time counters. If start() was executed more than |
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396 | ///once, then the same number of stop() execution is necessary the really |
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397 | ///stop the timer. |
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398 | /// |
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399 | ///\sa halt() |
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400 | ///\sa start() |
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401 | ///\sa restart() |
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402 | ///\sa reset() |
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403 | |
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404 | void stop() |
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405 | { |
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406 | if(_running && !--_running) { |
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407 | TimeStamp t; |
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408 | t.stamp(); |
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409 | start_time=t-start_time; |
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410 | } |
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411 | } |
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412 | |
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413 | ///Halt (i.e stop immediately) the time counters |
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414 | |
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415 | ///This function stops immediately the time counters. |
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416 | /// |
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417 | ///\sa stop() |
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418 | ///\sa restart() |
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419 | ///\sa reset() |
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420 | |
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421 | void halt() |
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422 | { |
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423 | if(_running) { |
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424 | _running=0; |
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425 | TimeStamp t; |
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426 | t.stamp(); |
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427 | start_time=t-start_time; |
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428 | } |
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429 | } |
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430 | |
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431 | ///Returns the running state of the timer |
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432 | |
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433 | ///This function returns the number of stop() exections that is |
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434 | ///necessary to really stop the timer. |
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435 | ///For example the timer |
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436 | ///is running if and only if the return value is \c true |
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437 | ///(i.e. greater than |
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438 | ///zero). |
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439 | int running() { return _running; } |
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440 | |
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441 | |
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442 | ///Restart the time counters |
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443 | |
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444 | ///This function is a shorthand for |
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445 | ///a reset() and a start() calls. |
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446 | /// |
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447 | void restart() |
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448 | { |
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449 | reset(); |
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450 | start(); |
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451 | } |
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452 | |
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453 | ///@} |
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454 | |
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455 | ///\name Query Functions for the ellapsed time |
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456 | |
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457 | ///@{ |
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458 | |
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459 | ///Gives back the ellapsed user time of the process |
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460 | double userTime() const |
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461 | { |
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462 | return operator TimeStamp().userTime(); |
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463 | } |
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464 | ///Gives back the ellapsed system time of the process |
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465 | double systemTime() const |
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466 | { |
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467 | return operator TimeStamp().systemTime(); |
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468 | } |
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469 | ///Gives back the ellapsed user time of the process' children |
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470 | double cUserTime() const |
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471 | { |
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472 | return operator TimeStamp().cUserTime(); |
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473 | } |
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474 | ///Gives back the ellapsed user time of the process' children |
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475 | double cSystemTime() const |
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476 | { |
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477 | return operator TimeStamp().cSystemTime(); |
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478 | } |
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479 | ///Gives back the ellapsed real time |
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480 | double realTime() const |
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481 | { |
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482 | return operator TimeStamp().realTime(); |
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483 | } |
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484 | ///Computes the ellapsed time |
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485 | |
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486 | ///This conversion computes the ellapsed time, therefore you can print |
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487 | ///the ellapsed time like this. |
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488 | ///\code |
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489 | /// Timer T; |
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490 | /// doSomething(); |
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491 | /// std::cout << T << '\n'; |
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492 | ///\endcode |
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493 | operator TimeStamp () const |
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494 | { |
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495 | TimeStamp t; |
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496 | t.stamp(); |
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497 | return _running?t-start_time:start_time; |
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498 | } |
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499 | |
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500 | |
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501 | ///@} |
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502 | }; |
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503 | |
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504 | ///Same as \ref Timer but prints a report on destruction. |
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505 | |
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506 | ///Same as \ref Timer but prints a report on destruction. |
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507 | ///This example shows its usage. |
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508 | ///\code |
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509 | /// void myAlg(ListGraph &g,int n) |
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510 | /// { |
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511 | /// TimeReport TR("Running time of myAlg: "); |
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512 | /// ... //Here comes the algorithm |
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513 | /// } |
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514 | ///\endcode |
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515 | /// |
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516 | ///\sa Timer |
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517 | ///\sa NoTimeReport |
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518 | ///\todo There is no test case for this |
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519 | class TimeReport : public Timer |
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520 | { |
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521 | std::string _title; |
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522 | std::ostream &_os; |
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523 | public: |
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524 | ///\e |
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525 | |
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526 | ///\param title This text will be printed before the ellapsed time. |
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527 | ///\param os The stream to print the report to. |
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528 | ///\param run Sets whether the timer should start immediately. |
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529 | |
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530 | TimeReport(std::string title,std::ostream &os=std::cerr,bool run=true) |
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531 | : Timer(run), _title(title), _os(os){} |
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532 | ///\e Prints the ellapsed time on destruction. |
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533 | ~TimeReport() |
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534 | { |
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535 | _os << _title << *this << std::endl; |
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536 | } |
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537 | }; |
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538 | |
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539 | ///'Do nothing' version of \ref TimeReport |
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540 | |
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541 | ///\sa TimeReport |
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542 | /// |
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543 | class NoTimeReport |
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544 | { |
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545 | public: |
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546 | ///\e |
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547 | NoTimeReport(std::string,std::ostream &,bool) {} |
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548 | ///\e |
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549 | NoTimeReport(std::string,std::ostream &) {} |
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550 | ///\e |
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551 | NoTimeReport(std::string) {} |
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552 | ///\e Do nothing. |
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553 | ~NoTimeReport() {} |
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554 | |
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555 | operator TimeStamp () const { return TimeStamp(); } |
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556 | void reset() {} |
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557 | void start() {} |
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558 | void stop() {} |
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559 | void halt() {} |
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560 | int running() { return 0; } |
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561 | void restart() {} |
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562 | double userTime() const { return 0; } |
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563 | double systemTime() const { return 0; } |
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564 | double cUserTime() const { return 0; } |
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565 | double cSystemTime() const { return 0; } |
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566 | double realTime() const { return 0; } |
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567 | }; |
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568 | |
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569 | ///Tool to measure the running time more exactly. |
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570 | |
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571 | ///This function calls \c f several times and returns the average |
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572 | ///running time. The number of the executions will be choosen in such a way |
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573 | ///that the full real running time will be roughly between \c min_time |
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574 | ///and <tt>2*min_time</tt>. |
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575 | ///\param f the function object to be measured. |
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576 | ///\param min_time the minimum total running time. |
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577 | ///\retval num if it is not \c NULL, then the actual |
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578 | /// number of execution of \c f will be written into <tt>*num</tt>. |
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579 | ///\retval full_time if it is not \c NULL, then the actual |
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580 | /// total running time will be written into <tt>*full_time</tt>. |
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581 | ///\return The average running time of \c f. |
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582 | |
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583 | template<class F> |
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584 | TimeStamp runningTimeTest(F f,double min_time=10,int *num = NULL, |
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585 | TimeStamp *full_time=NULL) |
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586 | { |
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587 | Timer t; |
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588 | TimeStamp full; |
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589 | int total=0; |
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590 | for(int tn=1;tn < 1<<30; tn*=2) { |
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591 | for(;total<tn;total++) f(); |
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592 | full=t; |
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593 | if(full.realTime()>min_time) { |
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594 | if(num) *num=total; |
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595 | if(full_time) *full_time=full; |
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596 | return full/total; |
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597 | } |
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598 | } |
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599 | return TimeStamp(); |
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600 | } |
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601 | |
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602 | /// @} |
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603 | |
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604 | |
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605 | } //namespace lemon |
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606 | |
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607 | #endif //LEMON_TIME_MEASURE_H |
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