1 | /* -*- C++ -*- |
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2 | * lemon/time_measure.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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6 | * |
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7 | * Permission to use, modify and distribute this software is granted |
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8 | * provided that this copyright notice appears in all copies. For |
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9 | * precise terms see the accompanying LICENSE file. |
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10 | * |
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11 | * This software is provided "AS IS" with no warranty of any kind, |
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12 | * express or implied, and with no claim as to its suitability for any |
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13 | * purpose. |
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14 | * |
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15 | */ |
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16 | |
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17 | #ifndef LEMON_TIME_MEASURE_H |
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18 | #define LEMON_TIME_MEASURE_H |
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19 | |
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20 | ///\ingroup misc |
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21 | ///\file |
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22 | ///\brief Tools for measuring cpu usage |
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23 | |
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24 | #include <sys/time.h> |
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25 | #include <sys/times.h> |
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26 | #include <fstream> |
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27 | #include <iostream> |
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28 | #include <unistd.h> |
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29 | |
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30 | namespace lemon { |
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31 | |
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32 | /// \addtogroup misc |
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33 | /// @{ |
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34 | |
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35 | /// A class to store (cpu)time instances. |
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36 | |
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37 | /// This class stores five time values. |
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38 | /// - a real time |
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39 | /// - a user cpu time |
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40 | /// - a system cpu time |
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41 | /// - a user cpu time of children |
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42 | /// - a system cpu time of children |
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43 | /// |
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44 | /// TimeStamp's can be added to or substracted from each other and |
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45 | /// they can be pushed to a stream. |
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46 | /// |
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47 | /// In most cases, perhaps \ref Timer class is what you want to use instead. |
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48 | /// |
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49 | ///\author Alpar Juttner |
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50 | |
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51 | class TimeStamp |
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52 | { |
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53 | struct rtms |
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54 | { |
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55 | double tms_utime; |
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56 | double tms_stime; |
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57 | double tms_cutime; |
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58 | double tms_cstime; |
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59 | rtms() {} |
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60 | rtms(tms ts) : tms_utime(ts.tms_utime), tms_stime(ts.tms_stime), |
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61 | tms_cutime(ts.tms_cutime), tms_cstime(ts.tms_cstime) {} |
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62 | }; |
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63 | rtms ts; |
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64 | double real_time; |
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65 | |
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66 | rtms &getTms() {return ts;} |
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67 | const rtms &getTms() const {return ts;} |
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68 | |
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69 | public: |
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70 | |
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71 | ///Read the current time values of the process |
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72 | void stamp() |
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73 | { |
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74 | timeval tv; |
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75 | tms _ts; |
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76 | times(&_ts); |
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77 | gettimeofday(&tv, 0);real_time=tv.tv_sec+double(tv.tv_usec)/1e6; |
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78 | ts=_ts; |
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79 | } |
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80 | |
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81 | /// Constructor initializing with zero |
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82 | TimeStamp() |
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83 | { ts.tms_utime=ts.tms_stime=ts.tms_cutime=ts.tms_cstime=0; real_time=0;} |
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84 | ///Constructor initializing with the current time values of the process |
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85 | TimeStamp(void *) { stamp();} |
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86 | |
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87 | ///\e |
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88 | TimeStamp &operator+=(const TimeStamp &b) |
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89 | { |
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90 | ts.tms_utime+=b.ts.tms_utime; |
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91 | ts.tms_stime+=b.ts.tms_stime; |
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92 | ts.tms_cutime+=b.ts.tms_cutime; |
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93 | ts.tms_cstime+=b.ts.tms_cstime; |
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94 | real_time+=b.real_time; |
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95 | return *this; |
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96 | } |
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97 | ///\e |
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98 | TimeStamp operator+(const TimeStamp &b) const |
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99 | { |
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100 | TimeStamp t(*this); |
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101 | return t+=b; |
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102 | } |
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103 | ///\e |
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104 | TimeStamp &operator-=(const TimeStamp &b) |
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105 | { |
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106 | ts.tms_utime-=b.ts.tms_utime; |
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107 | ts.tms_stime-=b.ts.tms_stime; |
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108 | ts.tms_cutime-=b.ts.tms_cutime; |
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109 | ts.tms_cstime-=b.ts.tms_cstime; |
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110 | real_time-=b.real_time; |
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111 | return *this; |
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112 | } |
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113 | ///\e |
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114 | TimeStamp operator-(const TimeStamp &b) const |
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115 | { |
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116 | TimeStamp t(*this); |
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117 | return t-=b; |
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118 | } |
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119 | ///\e |
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120 | |
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121 | ///\bug operator * and / gives rounded values! |
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122 | TimeStamp &operator*=(double b) |
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123 | { |
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124 | ts.tms_utime*=b; |
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125 | ts.tms_stime*=b; |
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126 | ts.tms_cutime*=b; |
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127 | ts.tms_cstime*=b; |
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128 | real_time*=b; |
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129 | return *this; |
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130 | } |
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131 | ///\e |
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132 | TimeStamp operator*(double b) const |
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133 | { |
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134 | TimeStamp t(*this); |
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135 | return t*=b; |
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136 | } |
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137 | friend TimeStamp operator*(double b,const TimeStamp &t); |
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138 | ///\e |
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139 | TimeStamp &operator/=(double b) |
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140 | { |
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141 | ts.tms_utime/=b; |
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142 | ts.tms_stime/=b; |
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143 | ts.tms_cutime/=b; |
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144 | ts.tms_cstime/=b; |
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145 | real_time/=b; |
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146 | return *this; |
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147 | } |
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148 | ///\e |
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149 | TimeStamp operator/(double b) const |
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150 | { |
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151 | TimeStamp t(*this); |
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152 | return t/=b; |
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153 | } |
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154 | ///The time ellapsed since the last call of stamp() |
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155 | TimeStamp ellapsed() const |
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156 | { |
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157 | TimeStamp t(NULL); |
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158 | return t-*this; |
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159 | } |
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160 | |
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161 | friend std::ostream& operator<<(std::ostream& os,const TimeStamp &t); |
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162 | |
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163 | ///Gives back the user time of the process |
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164 | double userTime() const |
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165 | { |
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166 | return double(ts.tms_utime)/sysconf(_SC_CLK_TCK); |
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167 | } |
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168 | ///Gives back the system time of the process |
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169 | double systemTime() const |
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170 | { |
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171 | return double(ts.tms_stime)/sysconf(_SC_CLK_TCK); |
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172 | } |
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173 | ///Gives back the user time of the process' children |
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174 | double cUserTime() const |
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175 | { |
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176 | return double(ts.tms_cutime)/sysconf(_SC_CLK_TCK); |
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177 | } |
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178 | ///Gives back the user time of the process' children |
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179 | double cSystemTime() const |
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180 | { |
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181 | return double(ts.tms_cstime)/sysconf(_SC_CLK_TCK); |
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182 | } |
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183 | ///Gives back the real time of the process |
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184 | double realTime() const {return real_time;} |
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185 | }; |
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186 | |
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187 | TimeStamp operator*(double b,const TimeStamp &t) |
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188 | { |
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189 | return t*b; |
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190 | } |
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191 | |
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192 | ///Class measuring the cpu time and real time usage of the process |
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193 | |
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194 | ///Class measuring the cpu time and real time usage of the process. |
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195 | ///It is quite easy-to-use, here is a short example. |
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196 | ///\code |
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197 | ///#include<lemon/time_measure.h> |
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198 | ///#include<iostream> |
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199 | /// |
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200 | ///int main() |
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201 | ///{ |
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202 | /// |
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203 | /// ... |
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204 | /// |
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205 | /// Timer T; |
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206 | /// doSomething(); |
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207 | /// std::cout << T << '\n'; |
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208 | /// T.reset(); |
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209 | /// doSomethingElse(); |
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210 | /// std::cout << T << '\n'; |
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211 | /// |
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212 | /// ... |
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213 | /// |
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214 | ///} |
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215 | ///\endcode |
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216 | /// |
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217 | ///\todo This shouldn't be Unix (Linux) specific. |
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218 | /// |
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219 | ///\author Alpar Juttner |
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220 | class Timer |
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221 | { |
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222 | TimeStamp start_time; |
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223 | |
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224 | void _reset() {start_time.stamp();} |
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225 | |
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226 | public: |
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227 | ///Constructor. It starts with zero time counters |
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228 | Timer() {_reset();} |
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229 | |
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230 | ///Computes the ellapsed time |
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231 | |
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232 | ///This conversion computes the ellapsed time |
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233 | ///since the construction of \c t or since |
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234 | ///the last \c t.reset(). |
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235 | operator TimeStamp () const |
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236 | { |
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237 | TimeStamp t; |
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238 | t.stamp(); |
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239 | return t-start_time; |
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240 | } |
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241 | |
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242 | ///Resets the time counters |
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243 | |
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244 | ///Resets the time counters |
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245 | /// |
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246 | void reset() |
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247 | { |
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248 | _reset(); |
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249 | } |
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250 | |
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251 | |
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252 | ///Gives back the ellapsed user time of the process |
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253 | double userTime() const |
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254 | { |
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255 | return operator TimeStamp().userTime(); |
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256 | } |
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257 | ///Gives back the ellapsed system time of the process |
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258 | double systemTime() const |
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259 | { |
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260 | return operator TimeStamp().systemTime(); |
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261 | } |
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262 | ///Gives back the ellapsed user time of the process' children |
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263 | double cUserTime() const |
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264 | { |
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265 | return operator TimeStamp().cUserTime(); |
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266 | } |
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267 | ///Gives back the ellapsed user time of the process' children |
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268 | double cSystemTime() const |
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269 | { |
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270 | return operator TimeStamp().cSystemTime(); |
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271 | } |
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272 | ///Gives back the ellapsed real time of the process |
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273 | double realTime() const |
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274 | { |
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275 | return operator TimeStamp().realTime(); |
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276 | } |
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277 | |
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278 | }; |
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279 | |
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280 | ///Prints the time counters |
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281 | |
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282 | ///Prints the time counters in the following form: |
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283 | /// |
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284 | /// <tt>u: XX.XXs s: XX.XXs cu: XX.XXs cs: XX.XXs real: XX.XXs</tt> |
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285 | /// |
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286 | /// where the values are the |
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287 | /// \li \c u: user cpu time, |
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288 | /// \li \c s: system cpu time, |
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289 | /// \li \c cu: user cpu time of children, |
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290 | /// \li \c cs: system cpu time of children, |
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291 | /// \li \c real: real time. |
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292 | /// \relates TimeStamp |
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293 | inline std::ostream& operator<<(std::ostream& os,const TimeStamp &t) |
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294 | { |
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295 | long cls = sysconf(_SC_CLK_TCK); |
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296 | os << "u: " << double(t.getTms().tms_utime)/cls << |
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297 | "s, s: " << double(t.getTms().tms_stime)/cls << |
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298 | "s, cu: " << double(t.getTms().tms_cutime)/cls << |
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299 | "s, cs: " << double(t.getTms().tms_cstime)/cls << |
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300 | "s, real: " << t.realTime() << "s"; |
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301 | return os; |
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302 | } |
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303 | |
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304 | |
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305 | ///Tool to measure the running time more exactly. |
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306 | |
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307 | ///This function calls \c f several times and returns the average |
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308 | ///running time. The number of the executions will be choosen in such a way |
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309 | ///that the full running time will be roughly between \c min_time |
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310 | ///and <tt>2*min_time</tt>. |
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311 | ///\param f the function object to be measured. |
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312 | ///\param min_time the minimum total running time. |
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313 | ///\retval num if it is not \c NULL, then *num will contain the actual |
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314 | /// number of execution of \c f. |
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315 | ///\retval full_time if it is not \c NULL, then *full_time |
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316 | /// will contain the actual |
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317 | /// total running time. |
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318 | ///\return The average running time of \c f. |
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319 | |
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320 | template<class F> |
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321 | TimeStamp runningTimeTest(F &f,double min_time=10,int *num = NULL, |
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322 | TimeStamp *full_time=NULL) |
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323 | { |
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324 | Timer t; |
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325 | TimeStamp full; |
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326 | int total=0; |
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327 | for(int tn=1;tn < 1<<24; tn*=2) { |
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328 | for(;total<tn;total++) f(); |
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329 | full=t; |
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330 | if(full.realTime()>min_time) { |
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331 | if(num) *num=total; |
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332 | if(full_time) *full_time=full; |
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333 | return full/total; |
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334 | } |
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335 | } |
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336 | return TimeStamp(); |
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337 | } |
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338 | |
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339 | /// @} |
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340 | |
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341 | |
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342 | } //namespace lemon |
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343 | |
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344 | #endif //LEMON_TIME_MEASURE_H |
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