1 | // boost cpu_timer.cpp ---------------------------------------------------------------//
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2 |
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3 | // Copyright Beman Dawes 1994-2006, 2011
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4 |
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5 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
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6 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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7 |
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8 | // See http://www.boost.org/libs/timer for documentation.
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9 |
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10 | //--------------------------------------------------------------------------------------//
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11 |
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12 | // define BOOST_TIMER_SOURCE so that <boost/timer/config.hpp> knows
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13 | // the library is being built (possibly exporting rather than importing code)
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14 | #define BOOST_TIMER_SOURCE
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15 |
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16 | #include <boost/timer/timer.hpp>
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17 | #include <boost/chrono/chrono.hpp>
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18 | #include <boost/io/ios_state.hpp>
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19 | #include <boost/throw_exception.hpp>
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20 | #include <boost/cerrno.hpp>
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21 | #include <cstring>
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22 | #include <sstream>
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23 | #include <cassert>
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24 |
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25 | # if defined(BOOST_WINDOWS_API)
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26 | # include <windows.h>
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27 | # elif defined(BOOST_POSIX_API)
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28 | # include <unistd.h>
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29 | # if !defined(__VXWORKS__)
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30 | # include <sys/times.h>
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31 | # endif
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32 | # else
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33 | # error unknown API
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34 | # endif
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35 |
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36 | using boost::timer::nanosecond_type;
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37 | using boost::timer::cpu_times;
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38 | using boost::system::error_code;
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39 |
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40 | namespace
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41 | {
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42 |
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43 | void show_time(const cpu_times& times,
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44 | std::ostream& os, const std::string& fmt, short places)
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45 | // NOTE WELL: Will truncate least-significant digits to LDBL_DIG, which may
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46 | // be as low as 10, although will be 15 for many common platforms.
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47 | {
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48 | if (places > 9)
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49 | places = 9;
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50 | else if (places < 0)
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51 | places = boost::timer::default_places;
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52 |
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53 | boost::io::ios_flags_saver ifs(os);
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54 | boost::io::ios_precision_saver ips(os);
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55 | os.setf(std::ios_base::fixed, std::ios_base::floatfield);
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56 | os.precision(places);
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57 |
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58 | const long double sec = 1000000000.0L;
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59 | nanosecond_type total = times.system + times.user;
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60 | long double wall_sec = times.wall / sec;
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61 | long double total_sec = total / sec;
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62 |
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63 | for (const char* format = fmt.c_str(); *format; ++format)
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64 | {
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65 | if (*format != '%' || !*(format+1) || !std::strchr("wustp", *(format+1)))
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66 | os << *format; // anything except % followed by a valid format character
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67 | // gets sent to the output stream
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68 | else
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69 | {
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70 | ++format;
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71 | switch (*format)
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72 | {
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73 | case 'w':
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74 | os << times.wall / sec;
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75 | break;
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76 | case 'u':
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77 | os << times.user / sec;
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78 | break;
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79 | case 's':
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80 | os << times.system / sec;
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81 | break;
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82 | case 't':
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83 | os << total / sec;
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84 | break;
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85 | case 'p':
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86 | os.precision(1);
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87 | if (wall_sec > 0.001L && total_sec > 0.001L)
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88 | os << (total_sec/wall_sec) * 100.0;
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89 | else
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90 | os << "n/a";
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91 | os.precision(places);
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92 | break;
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93 | }
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94 | }
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95 | }
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96 | }
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97 |
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98 | # if defined(BOOST_POSIX_API)
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99 | boost::int_least64_t tick_factor() // multiplier to convert ticks
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100 | // to nanoseconds; -1 if unknown
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101 | {
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102 | static boost::int_least64_t tick_factor = 0;
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103 | if (!tick_factor)
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104 | {
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105 | if ((tick_factor = ::sysconf(_SC_CLK_TCK)) <= 0)
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106 | tick_factor = -1;
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107 | else
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108 | {
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109 | assert(tick_factor <= 1000000000LL); // logic doesn't handle large ticks
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110 | tick_factor = 1000000000LL / tick_factor; // compute factor
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111 | if (!tick_factor)
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112 | tick_factor = -1;
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113 | }
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114 | }
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115 | return tick_factor;
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116 | }
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117 | # endif
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118 |
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119 | void get_cpu_times(boost::timer::cpu_times& current)
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120 | {
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121 | boost::chrono::duration<boost::int64_t, boost::nano>
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122 | x (boost::chrono::high_resolution_clock::now().time_since_epoch());
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123 | current.wall = x.count();
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124 |
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125 | # if defined(BOOST_WINDOWS_API)
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126 |
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127 | FILETIME creation, exit;
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128 | if (::GetProcessTimes(::GetCurrentProcess(), &creation, &exit,
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129 | (LPFILETIME)¤t.system, (LPFILETIME)¤t.user))
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130 | {
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131 | current.user *= 100; // Windows uses 100 nanosecond ticks
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132 | current.system *= 100;
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133 | }
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134 | else
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135 | {
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136 | current.system = current.user = boost::timer::nanosecond_type(-1);
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137 | }
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138 | # else
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139 | tms tm;
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140 | clock_t c = ::times(&tm);
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141 | if (c == -1) // error
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142 | {
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143 | current.system = current.user = boost::timer::nanosecond_type(-1);
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144 | }
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145 | else
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146 | {
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147 | current.system = boost::timer::nanosecond_type(tm.tms_stime + tm.tms_cstime);
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148 | current.user = boost::timer::nanosecond_type(tm.tms_utime + tm.tms_cutime);
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149 | boost::int_least64_t factor;
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150 | if ((factor = tick_factor()) != -1)
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151 | {
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152 | current.user *= factor;
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153 | current.system *= factor;
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154 | }
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155 | else
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156 | {
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157 | current.user = current.system = boost::timer::nanosecond_type(-1);
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158 | }
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159 | }
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160 | # endif
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161 | }
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162 |
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163 | // CAUTION: must be identical to same constant in auto_timers_construction.cpp
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164 | const std::string default_fmt(" %ws wall, %us user + %ss system = %ts CPU (%p%)\n");
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165 |
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166 | } // unnamed namespace
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167 |
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168 | namespace boost
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169 | {
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170 | namespace timer
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171 | {
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172 | // format ------------------------------------------------------------------------//
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173 |
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174 | BOOST_TIMER_DECL
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175 | std::string format(const cpu_times& times, short places, const std::string& fmt)
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176 | {
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177 | std::stringstream ss;
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178 | show_time(times, ss, fmt, places);
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179 | return ss.str();
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180 | }
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181 |
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182 | BOOST_TIMER_DECL
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183 | std::string format(const cpu_times& times, short places)
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184 | {
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185 | return format(times, places, default_fmt);
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186 | }
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187 |
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188 | // cpu_timer ---------------------------------------------------------------------//
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189 |
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190 | void cpu_timer::start()
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191 | {
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192 | m_is_stopped = false;
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193 | get_cpu_times(m_times);
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194 | }
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195 |
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196 | void cpu_timer::stop()
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197 | {
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198 | if (is_stopped())
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199 | return;
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200 | m_is_stopped = true;
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201 |
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202 | cpu_times current;
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203 | get_cpu_times(current);
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204 | m_times.wall = (current.wall - m_times.wall);
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205 | m_times.user = (current.user - m_times.user);
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206 | m_times.system = (current.system - m_times.system);
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207 | }
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208 |
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209 | cpu_times cpu_timer::elapsed() const
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210 | {
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211 | if (is_stopped())
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212 | return m_times;
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213 | cpu_times current;
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214 | get_cpu_times(current);
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215 | current.wall -= m_times.wall;
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216 | current.user -= m_times.user;
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217 | current.system -= m_times.system;
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218 | return current;
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219 | }
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220 |
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221 | void cpu_timer::resume()
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222 | {
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223 | if (is_stopped())
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224 | {
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225 | cpu_times current (m_times);
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226 | start();
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227 | m_times.wall -= current.wall;
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228 | m_times.user -= current.user;
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229 | m_times.system -= current.system;
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230 | }
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231 | }
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232 |
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233 | // auto_cpu_timer ----------------------------------------------------------------//
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234 |
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235 | auto_cpu_timer::auto_cpu_timer(std::ostream& os, short places) // #5
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236 | : m_places(places), m_os(&os), m_format(default_fmt)
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237 | {
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238 | start();
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239 | }
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240 |
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241 | void auto_cpu_timer::report()
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242 | {
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243 | show_time(elapsed(), ostream(), format_string(), places());
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244 | }
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245 |
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246 | auto_cpu_timer::~auto_cpu_timer()
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247 | {
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248 | if (!is_stopped())
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249 | {
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250 | stop(); // the sooner we stop(), the better
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251 | try
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252 | {
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253 | report();
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254 | }
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255 | catch (...) // eat any exceptions
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256 | {
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257 | }
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258 | }
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259 | }
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260 |
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261 | } // namespace timer
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262 | } // namespace boost
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