[209] | 1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
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[119] | 2 | * |
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[209] | 3 | * This file is a part of LEMON, a generic C++ optimization library. |
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[119] | 4 | * |
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[1270] | 5 | * Copyright (C) 2003-2013 |
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[119] | 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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[1340] | 26 | #include <lemon/config.h> |
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| 27 | |
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| 28 | #ifdef LEMON_WIN32 |
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[511] | 29 | #include <lemon/bits/windows.h> |
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[126] | 30 | #else |
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[507] | 31 | #include <unistd.h> |
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[119] | 32 | #include <sys/times.h> |
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[126] | 33 | #include <sys/time.h> |
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| 34 | #endif |
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[119] | 35 | |
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[143] | 36 | #include <string> |
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[119] | 37 | #include <fstream> |
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| 38 | #include <iostream> |
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[1222] | 39 | #include <lemon/math.h> |
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[119] | 40 | |
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| 41 | namespace lemon { |
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| 42 | |
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| 43 | /// \addtogroup timecount |
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| 44 | /// @{ |
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| 45 | |
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| 46 | /// A class to store (cpu)time instances. |
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| 47 | |
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| 48 | /// This class stores five time values. |
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| 49 | /// - a real time |
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| 50 | /// - a user cpu time |
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| 51 | /// - a system cpu time |
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| 52 | /// - a user cpu time of children |
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| 53 | /// - a system cpu time of children |
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| 54 | /// |
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| 55 | /// TimeStamp's can be added to or substracted from each other and |
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| 56 | /// they can be pushed to a stream. |
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| 57 | /// |
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| 58 | /// In most cases, perhaps the \ref Timer or the \ref TimeReport |
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| 59 | /// class is what you want to use instead. |
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| 60 | |
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| 61 | class TimeStamp |
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| 62 | { |
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[126] | 63 | double utime; |
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| 64 | double stime; |
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| 65 | double cutime; |
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| 66 | double cstime; |
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| 67 | double rtime; |
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[209] | 68 | |
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[1222] | 69 | public: |
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| 70 | ///Display format specifier |
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| 71 | |
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| 72 | ///\e |
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| 73 | /// |
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| 74 | enum Format { |
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| 75 | /// Reports all measured values |
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| 76 | NORMAL = 0, |
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| 77 | /// Only real time and an error indicator is displayed |
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| 78 | SHORT = 1 |
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| 79 | }; |
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| 80 | |
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| 81 | private: |
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| 82 | static Format _format; |
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| 83 | |
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[209] | 84 | void _reset() { |
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[126] | 85 | utime = stime = cutime = cstime = rtime = 0; |
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[119] | 86 | } |
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| 87 | |
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| 88 | public: |
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| 89 | |
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[1222] | 90 | ///Set output format |
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| 91 | |
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| 92 | ///Set output format. |
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| 93 | /// |
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| 94 | ///The output format is global for all timestamp instances. |
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| 95 | static void format(Format f) { _format = f; } |
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| 96 | ///Retrieve the current output format |
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| 97 | |
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| 98 | ///Retrieve the current output format |
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| 99 | /// |
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| 100 | ///The output format is global for all timestamp instances. |
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| 101 | static Format format() { return _format; } |
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| 102 | |
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[1270] | 103 | |
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[119] | 104 | ///Read the current time values of the process |
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| 105 | void stamp() |
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| 106 | { |
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[1340] | 107 | #ifndef LEMON_WIN32 |
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[119] | 108 | timeval tv; |
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[126] | 109 | gettimeofday(&tv, 0); |
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| 110 | rtime=tv.tv_sec+double(tv.tv_usec)/1e6; |
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| 111 | |
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| 112 | tms ts; |
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| 113 | double tck=sysconf(_SC_CLK_TCK); |
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| 114 | times(&ts); |
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| 115 | utime=ts.tms_utime/tck; |
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| 116 | stime=ts.tms_stime/tck; |
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| 117 | cutime=ts.tms_cutime/tck; |
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| 118 | cstime=ts.tms_cstime/tck; |
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| 119 | #else |
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[511] | 120 | bits::getWinProcTimes(rtime, utime, stime, cutime, cstime); |
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[209] | 121 | #endif |
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[119] | 122 | } |
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[209] | 123 | |
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[119] | 124 | /// Constructor initializing with zero |
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| 125 | TimeStamp() |
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| 126 | { _reset(); } |
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| 127 | ///Constructor initializing with the current time values of the process |
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| 128 | TimeStamp(void *) { stamp();} |
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[209] | 129 | |
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[119] | 130 | ///Set every time value to zero |
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| 131 | TimeStamp &reset() {_reset();return *this;} |
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| 132 | |
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| 133 | ///\e |
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| 134 | TimeStamp &operator+=(const TimeStamp &b) |
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| 135 | { |
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[126] | 136 | utime+=b.utime; |
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| 137 | stime+=b.stime; |
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| 138 | cutime+=b.cutime; |
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| 139 | cstime+=b.cstime; |
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| 140 | rtime+=b.rtime; |
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[119] | 141 | return *this; |
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| 142 | } |
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| 143 | ///\e |
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| 144 | TimeStamp operator+(const TimeStamp &b) const |
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| 145 | { |
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| 146 | TimeStamp t(*this); |
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| 147 | return t+=b; |
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| 148 | } |
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| 149 | ///\e |
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| 150 | TimeStamp &operator-=(const TimeStamp &b) |
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| 151 | { |
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[126] | 152 | utime-=b.utime; |
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| 153 | stime-=b.stime; |
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| 154 | cutime-=b.cutime; |
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| 155 | cstime-=b.cstime; |
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| 156 | rtime-=b.rtime; |
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[119] | 157 | return *this; |
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| 158 | } |
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| 159 | ///\e |
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| 160 | TimeStamp operator-(const TimeStamp &b) const |
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| 161 | { |
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| 162 | TimeStamp t(*this); |
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| 163 | return t-=b; |
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| 164 | } |
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| 165 | ///\e |
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| 166 | TimeStamp &operator*=(double b) |
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| 167 | { |
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[126] | 168 | utime*=b; |
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| 169 | stime*=b; |
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| 170 | cutime*=b; |
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| 171 | cstime*=b; |
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| 172 | rtime*=b; |
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[119] | 173 | return *this; |
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| 174 | } |
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| 175 | ///\e |
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| 176 | TimeStamp operator*(double b) const |
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| 177 | { |
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| 178 | TimeStamp t(*this); |
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| 179 | return t*=b; |
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| 180 | } |
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| 181 | friend TimeStamp operator*(double b,const TimeStamp &t); |
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| 182 | ///\e |
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| 183 | TimeStamp &operator/=(double b) |
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| 184 | { |
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[126] | 185 | utime/=b; |
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| 186 | stime/=b; |
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| 187 | cutime/=b; |
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| 188 | cstime/=b; |
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| 189 | rtime/=b; |
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[119] | 190 | return *this; |
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| 191 | } |
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| 192 | ///\e |
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| 193 | TimeStamp operator/(double b) const |
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| 194 | { |
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| 195 | TimeStamp t(*this); |
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| 196 | return t/=b; |
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| 197 | } |
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| 198 | ///The time ellapsed since the last call of stamp() |
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| 199 | TimeStamp ellapsed() const |
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| 200 | { |
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| 201 | TimeStamp t(NULL); |
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| 202 | return t-*this; |
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| 203 | } |
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[209] | 204 | |
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[119] | 205 | friend std::ostream& operator<<(std::ostream& os,const TimeStamp &t); |
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[209] | 206 | |
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[119] | 207 | ///Gives back the user time of the process |
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| 208 | double userTime() const |
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| 209 | { |
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[126] | 210 | return utime; |
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[119] | 211 | } |
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| 212 | ///Gives back the system time of the process |
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| 213 | double systemTime() const |
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| 214 | { |
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[126] | 215 | return stime; |
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[119] | 216 | } |
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| 217 | ///Gives back the user time of the process' children |
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[126] | 218 | |
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[209] | 219 | ///\note On <tt>WIN32</tt> platform this value is not calculated. |
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[126] | 220 | /// |
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[119] | 221 | double cUserTime() const |
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| 222 | { |
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[126] | 223 | return cutime; |
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[119] | 224 | } |
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| 225 | ///Gives back the user time of the process' children |
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[126] | 226 | |
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[209] | 227 | ///\note On <tt>WIN32</tt> platform this value is not calculated. |
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[126] | 228 | /// |
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[119] | 229 | double cSystemTime() const |
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| 230 | { |
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[126] | 231 | return cstime; |
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[119] | 232 | } |
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| 233 | ///Gives back the real time |
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[126] | 234 | double realTime() const {return rtime;} |
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[119] | 235 | }; |
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| 236 | |
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[528] | 237 | inline TimeStamp operator*(double b,const TimeStamp &t) |
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[119] | 238 | { |
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| 239 | return t*b; |
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| 240 | } |
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[209] | 241 | |
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[119] | 242 | ///Prints the time counters |
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| 243 | |
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| 244 | ///Prints the time counters in the following form: |
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| 245 | /// |
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| 246 | /// <tt>u: XX.XXs s: XX.XXs cu: XX.XXs cs: XX.XXs real: XX.XXs</tt> |
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| 247 | /// |
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| 248 | /// where the values are the |
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| 249 | /// \li \c u: user cpu time, |
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| 250 | /// \li \c s: system cpu time, |
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| 251 | /// \li \c cu: user cpu time of children, |
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| 252 | /// \li \c cs: system cpu time of children, |
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| 253 | /// \li \c real: real time. |
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| 254 | /// \relates TimeStamp |
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[126] | 255 | /// \note On <tt>WIN32</tt> platform the cummulative values are not |
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| 256 | /// calculated. |
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[119] | 257 | inline std::ostream& operator<<(std::ostream& os,const TimeStamp &t) |
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| 258 | { |
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[1222] | 259 | switch(t._format) |
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| 260 | { |
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| 261 | case TimeStamp::NORMAL: |
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| 262 | os << "u: " << t.userTime() << |
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| 263 | "s, s: " << t.systemTime() << |
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| 264 | "s, cu: " << t.cUserTime() << |
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| 265 | "s, cs: " << t.cSystemTime() << |
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| 266 | "s, real: " << t.realTime() << "s"; |
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| 267 | break; |
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| 268 | case TimeStamp::SHORT: |
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| 269 | double total = t.userTime()+t.systemTime()+ |
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| 270 | t.cUserTime()+t.cSystemTime(); |
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| 271 | os << t.realTime() |
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| 272 | << "s (err: " << round((t.realTime()-total)/ |
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| 273 | t.realTime()*10000)/100 |
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| 274 | << "%)"; |
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| 275 | break; |
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| 276 | } |
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[119] | 277 | return os; |
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| 278 | } |
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| 279 | |
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| 280 | ///Class for measuring the cpu time and real time usage of the process |
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| 281 | |
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| 282 | ///Class for measuring the cpu time and real time usage of the process. |
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| 283 | ///It is quite easy-to-use, here is a short example. |
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| 284 | ///\code |
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| 285 | /// #include<lemon/time_measure.h> |
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| 286 | /// #include<iostream> |
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| 287 | /// |
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| 288 | /// int main() |
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| 289 | /// { |
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| 290 | /// |
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| 291 | /// ... |
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| 292 | /// |
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| 293 | /// Timer t; |
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| 294 | /// doSomething(); |
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| 295 | /// std::cout << t << '\n'; |
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| 296 | /// t.restart(); |
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| 297 | /// doSomethingElse(); |
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| 298 | /// std::cout << t << '\n'; |
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| 299 | /// |
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| 300 | /// ... |
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| 301 | /// |
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| 302 | /// } |
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| 303 | ///\endcode |
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| 304 | /// |
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| 305 | ///The \ref Timer can also be \ref stop() "stopped" and |
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| 306 | ///\ref start() "started" again, so it is possible to compute collected |
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| 307 | ///running times. |
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| 308 | /// |
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| 309 | ///\warning Depending on the operation system and its actual configuration |
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| 310 | ///the time counters have a certain (10ms on a typical Linux system) |
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| 311 | ///granularity. |
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| 312 | ///Therefore this tool is not appropriate to measure very short times. |
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| 313 | ///Also, if you start and stop the timer very frequently, it could lead to |
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| 314 | ///distorted results. |
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| 315 | /// |
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| 316 | ///\note If you want to measure the running time of the execution of a certain |
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| 317 | ///function, consider the usage of \ref TimeReport instead. |
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| 318 | /// |
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| 319 | ///\sa TimeReport |
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| 320 | class Timer |
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| 321 | { |
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| 322 | int _running; //Timer is running iff _running>0; (_running>=0 always holds) |
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| 323 | TimeStamp start_time; //This is the relativ start-time if the timer |
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| 324 | //is _running, the collected _running time otherwise. |
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[209] | 325 | |
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[119] | 326 | void _reset() {if(_running) start_time.stamp(); else start_time.reset();} |
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[209] | 327 | |
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| 328 | public: |
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[119] | 329 | ///Constructor. |
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| 330 | |
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| 331 | ///\param run indicates whether or not the timer starts immediately. |
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| 332 | /// |
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| 333 | Timer(bool run=true) :_running(run) {_reset();} |
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| 334 | |
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[631] | 335 | ///\name Control the State of the Timer |
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[119] | 336 | ///Basically a Timer can be either running or stopped, |
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| 337 | ///but it provides a bit finer control on the execution. |
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[314] | 338 | ///The \ref lemon::Timer "Timer" also counts the number of |
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| 339 | ///\ref lemon::Timer::start() "start()" executions, and it stops |
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[313] | 340 | ///only after the same amount (or more) \ref lemon::Timer::stop() |
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| 341 | ///"stop()"s. This can be useful e.g. to compute the running time |
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[119] | 342 | ///of recursive functions. |
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| 343 | |
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| 344 | ///@{ |
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| 345 | |
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| 346 | ///Reset and stop the time counters |
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| 347 | |
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| 348 | ///This function resets and stops the time counters |
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| 349 | ///\sa restart() |
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| 350 | void reset() |
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| 351 | { |
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| 352 | _running=0; |
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| 353 | _reset(); |
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| 354 | } |
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| 355 | |
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| 356 | ///Start the time counters |
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[209] | 357 | |
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[119] | 358 | ///This function starts the time counters. |
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| 359 | /// |
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| 360 | ///If the timer is started more than ones, it will remain running |
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| 361 | ///until the same amount of \ref stop() is called. |
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| 362 | ///\sa stop() |
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[209] | 363 | void start() |
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[119] | 364 | { |
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| 365 | if(_running) _running++; |
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| 366 | else { |
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[209] | 367 | _running=1; |
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| 368 | TimeStamp t; |
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| 369 | t.stamp(); |
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| 370 | start_time=t-start_time; |
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[119] | 371 | } |
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| 372 | } |
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| 373 | |
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[209] | 374 | |
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[119] | 375 | ///Stop the time counters |
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| 376 | |
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| 377 | ///This function stops the time counters. If start() was executed more than |
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| 378 | ///once, then the same number of stop() execution is necessary the really |
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| 379 | ///stop the timer. |
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[209] | 380 | /// |
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[119] | 381 | ///\sa halt() |
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| 382 | ///\sa start() |
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| 383 | ///\sa restart() |
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| 384 | ///\sa reset() |
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| 385 | |
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[209] | 386 | void stop() |
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[119] | 387 | { |
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| 388 | if(_running && !--_running) { |
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[209] | 389 | TimeStamp t; |
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| 390 | t.stamp(); |
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| 391 | start_time=t-start_time; |
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[119] | 392 | } |
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| 393 | } |
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| 394 | |
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| 395 | ///Halt (i.e stop immediately) the time counters |
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| 396 | |
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[120] | 397 | ///This function stops immediately the time counters, i.e. <tt>t.halt()</tt> |
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[119] | 398 | ///is a faster |
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| 399 | ///equivalent of the following. |
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| 400 | ///\code |
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| 401 | /// while(t.running()) t.stop() |
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| 402 | ///\endcode |
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| 403 | /// |
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| 404 | /// |
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| 405 | ///\sa stop() |
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| 406 | ///\sa restart() |
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| 407 | ///\sa reset() |
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| 408 | |
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[209] | 409 | void halt() |
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[119] | 410 | { |
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| 411 | if(_running) { |
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[209] | 412 | _running=0; |
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| 413 | TimeStamp t; |
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| 414 | t.stamp(); |
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| 415 | start_time=t-start_time; |
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[119] | 416 | } |
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| 417 | } |
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| 418 | |
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| 419 | ///Returns the running state of the timer |
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| 420 | |
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| 421 | ///This function returns the number of stop() exections that is |
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| 422 | ///necessary to really stop the timer. |
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[833] | 423 | ///For example, the timer |
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[119] | 424 | ///is running if and only if the return value is \c true |
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| 425 | ///(i.e. greater than |
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| 426 | ///zero). |
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| 427 | int running() { return _running; } |
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[209] | 428 | |
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| 429 | |
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[119] | 430 | ///Restart the time counters |
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| 431 | |
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| 432 | ///This function is a shorthand for |
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| 433 | ///a reset() and a start() calls. |
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| 434 | /// |
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[209] | 435 | void restart() |
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[119] | 436 | { |
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| 437 | reset(); |
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| 438 | start(); |
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| 439 | } |
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[209] | 440 | |
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[119] | 441 | ///@} |
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| 442 | |
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[631] | 443 | ///\name Query Functions for the Ellapsed Time |
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[119] | 444 | |
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| 445 | ///@{ |
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| 446 | |
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| 447 | ///Gives back the ellapsed user time of the process |
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| 448 | double userTime() const |
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| 449 | { |
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| 450 | return operator TimeStamp().userTime(); |
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| 451 | } |
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| 452 | ///Gives back the ellapsed system time of the process |
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| 453 | double systemTime() const |
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| 454 | { |
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| 455 | return operator TimeStamp().systemTime(); |
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| 456 | } |
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| 457 | ///Gives back the ellapsed user time of the process' children |
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[126] | 458 | |
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[209] | 459 | ///\note On <tt>WIN32</tt> platform this value is not calculated. |
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[126] | 460 | /// |
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[119] | 461 | double cUserTime() const |
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| 462 | { |
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| 463 | return operator TimeStamp().cUserTime(); |
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| 464 | } |
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| 465 | ///Gives back the ellapsed user time of the process' children |
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[126] | 466 | |
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[209] | 467 | ///\note On <tt>WIN32</tt> platform this value is not calculated. |
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[126] | 468 | /// |
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[119] | 469 | double cSystemTime() const |
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| 470 | { |
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| 471 | return operator TimeStamp().cSystemTime(); |
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| 472 | } |
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| 473 | ///Gives back the ellapsed real time |
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| 474 | double realTime() const |
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| 475 | { |
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| 476 | return operator TimeStamp().realTime(); |
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| 477 | } |
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| 478 | ///Computes the ellapsed time |
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| 479 | |
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| 480 | ///This conversion computes the ellapsed time, therefore you can print |
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| 481 | ///the ellapsed time like this. |
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| 482 | ///\code |
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| 483 | /// Timer t; |
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| 484 | /// doSomething(); |
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| 485 | /// std::cout << t << '\n'; |
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| 486 | ///\endcode |
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| 487 | operator TimeStamp () const |
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| 488 | { |
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| 489 | TimeStamp t; |
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| 490 | t.stamp(); |
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| 491 | return _running?t-start_time:start_time; |
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| 492 | } |
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| 493 | |
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| 494 | |
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| 495 | ///@} |
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| 496 | }; |
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| 497 | |
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[313] | 498 | ///Same as Timer but prints a report on destruction. |
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[119] | 499 | |
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| 500 | ///Same as \ref Timer but prints a report on destruction. |
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| 501 | ///This example shows its usage. |
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| 502 | ///\code |
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| 503 | /// void myAlg(ListGraph &g,int n) |
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| 504 | /// { |
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| 505 | /// TimeReport tr("Running time of myAlg: "); |
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| 506 | /// ... //Here comes the algorithm |
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| 507 | /// } |
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| 508 | ///\endcode |
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| 509 | /// |
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| 510 | ///\sa Timer |
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| 511 | ///\sa NoTimeReport |
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[209] | 512 | class TimeReport : public Timer |
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[119] | 513 | { |
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| 514 | std::string _title; |
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| 515 | std::ostream &_os; |
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[1222] | 516 | bool _active; |
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[119] | 517 | public: |
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[313] | 518 | ///Constructor |
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[119] | 519 | |
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[313] | 520 | ///Constructor. |
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[119] | 521 | ///\param title This text will be printed before the ellapsed time. |
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| 522 | ///\param os The stream to print the report to. |
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| 523 | ///\param run Sets whether the timer should start immediately. |
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[1222] | 524 | ///\param active Sets whether the report should actually be printed |
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| 525 | /// on destruction. |
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| 526 | TimeReport(std::string title,std::ostream &os=std::cerr,bool run=true, |
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[1270] | 527 | bool active=true) |
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[1222] | 528 | : Timer(run), _title(title), _os(os), _active(active) {} |
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[313] | 529 | ///Destructor that prints the ellapsed time |
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[209] | 530 | ~TimeReport() |
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[119] | 531 | { |
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[1222] | 532 | if(_active) _os << _title << *this << std::endl; |
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[119] | 533 | } |
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[1270] | 534 | |
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[1222] | 535 | ///Retrieve the activity status |
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| 536 | |
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| 537 | ///\e |
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| 538 | /// |
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| 539 | bool active() const { return _active; } |
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| 540 | ///Set the activity status |
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| 541 | |
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| 542 | /// This function set whether the time report should actually be printed |
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| 543 | /// on destruction. |
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| 544 | void active(bool a) { _active=a; } |
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[119] | 545 | }; |
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[209] | 546 | |
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[313] | 547 | ///'Do nothing' version of TimeReport |
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[119] | 548 | |
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| 549 | ///\sa TimeReport |
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| 550 | /// |
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| 551 | class NoTimeReport |
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| 552 | { |
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| 553 | public: |
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| 554 | ///\e |
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| 555 | NoTimeReport(std::string,std::ostream &,bool) {} |
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| 556 | ///\e |
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| 557 | NoTimeReport(std::string,std::ostream &) {} |
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| 558 | ///\e |
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| 559 | NoTimeReport(std::string) {} |
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| 560 | ///\e Do nothing. |
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| 561 | ~NoTimeReport() {} |
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| 562 | |
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| 563 | operator TimeStamp () const { return TimeStamp(); } |
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| 564 | void reset() {} |
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| 565 | void start() {} |
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| 566 | void stop() {} |
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[209] | 567 | void halt() {} |
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[119] | 568 | int running() { return 0; } |
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| 569 | void restart() {} |
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| 570 | double userTime() const { return 0; } |
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| 571 | double systemTime() const { return 0; } |
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| 572 | double cUserTime() const { return 0; } |
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| 573 | double cSystemTime() const { return 0; } |
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| 574 | double realTime() const { return 0; } |
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| 575 | }; |
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[209] | 576 | |
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[119] | 577 | ///Tool to measure the running time more exactly. |
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[209] | 578 | |
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[119] | 579 | ///This function calls \c f several times and returns the average |
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| 580 | ///running time. The number of the executions will be choosen in such a way |
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| 581 | ///that the full real running time will be roughly between \c min_time |
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| 582 | ///and <tt>2*min_time</tt>. |
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| 583 | ///\param f the function object to be measured. |
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| 584 | ///\param min_time the minimum total running time. |
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| 585 | ///\retval num if it is not \c NULL, then the actual |
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| 586 | /// number of execution of \c f will be written into <tt>*num</tt>. |
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| 587 | ///\retval full_time if it is not \c NULL, then the actual |
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| 588 | /// total running time will be written into <tt>*full_time</tt>. |
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| 589 | ///\return The average running time of \c f. |
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[209] | 590 | |
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[119] | 591 | template<class F> |
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| 592 | TimeStamp runningTimeTest(F f,double min_time=10,unsigned int *num = NULL, |
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| 593 | TimeStamp *full_time=NULL) |
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| 594 | { |
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| 595 | TimeStamp full; |
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| 596 | unsigned int total=0; |
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| 597 | Timer t; |
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| 598 | for(unsigned int tn=1;tn <= 1U<<31 && full.realTime()<=min_time; tn*=2) { |
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| 599 | for(;total<tn;total++) f(); |
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| 600 | full=t; |
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| 601 | } |
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| 602 | if(num) *num=total; |
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| 603 | if(full_time) *full_time=full; |
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| 604 | return full/total; |
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| 605 | } |
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[209] | 606 | |
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| 607 | /// @} |
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[119] | 608 | |
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| 609 | |
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| 610 | } //namespace lemon |
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| 611 | |
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| 612 | #endif //LEMON_TIME_MEASURE_H |
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