1 | // (C) Copyright Antony Polukhin 2012.
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2 | // Use, modification and distribution are subject to the
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3 | // Boost Software License, Version 1.0. (See accompanying file
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4 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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5 |
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6 | // See http://www.boost.org/libs/config for most recent version.
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7 |
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8 | //
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9 | // Testing variant performance rvalue copy/assign performance
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10 | //
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11 |
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12 | #define BOOST_ERROR_CODE_HEADER_ONLY
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13 | #define BOOST_CHRONO_HEADER_ONLY
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14 | #include <boost/chrono.hpp>
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15 |
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16 | #include <boost/variant.hpp>
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17 | #include <string>
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18 | #include <vector>
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19 |
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20 | struct scope {
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21 | typedef boost::chrono::steady_clock test_clock;
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22 | typedef boost::chrono::milliseconds duration_t;
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23 | test_clock::time_point start_;
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24 | const char* const message_;
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25 |
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26 | explicit scope(const char* const message)
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27 | : start_(test_clock::now())
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28 | , message_(message)
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29 | {}
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30 |
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31 | ~scope() {
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32 | std::cout << message_ << " " << boost::chrono::duration_cast<duration_t>(test_clock::now() - start_) << std::endl;
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33 | }
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34 | };
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35 |
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36 |
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37 |
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38 | static void do_test(bool do_count_cleanup_time = false) {
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39 | BOOST_STATIC_CONSTANT(std::size_t, c_run_count = 5000000);
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40 | typedef std::vector<char> str_t;
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41 | typedef boost::variant<int, str_t, float> var_t;
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42 |
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43 | const char hello1_c[] = "hello long word";
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44 | const str_t hello1(hello1_c, hello1_c + sizeof(hello1_c));
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45 |
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46 | const char hello2_c[] = "Helllloooooooooooooooooooooooooooooooo!!!!!!!!!!!!!";
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47 | const str_t hello2(hello2_c, hello2_c + sizeof(hello2_c));
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48 |
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49 | if (do_count_cleanup_time) {
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50 | std::cout << "#############################################\n";
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51 | std::cout << "#############################################\n";
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52 | std::cout << "NOW TIMES WITH DATA DESTRUCTION\n";
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53 | std::cout << "#############################################\n";
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54 | }
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55 |
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56 | std::vector<var_t> data_from, data_to;
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57 | data_from.resize(c_run_count, hello1);
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58 | data_to.reserve(c_run_count);
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59 | {
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60 | scope sc("boost::variant(const variant&) copying speed");
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61 | for (std::size_t i = 0; i < c_run_count; ++i) {
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62 | data_to.push_back(data_from[i]);
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63 |
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64 | }
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65 |
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66 | if (do_count_cleanup_time) {
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67 | data_to.clear();
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68 | data_from.clear();
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69 | }
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70 | }
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71 |
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72 | data_from.resize(c_run_count, hello1);
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73 | data_to.clear();
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74 | data_to.reserve(c_run_count);
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75 | {
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76 | scope sc("boost::variant(variant&&) moving speed");
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77 | for (std::size_t i = 0; i < c_run_count; ++i) {
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78 | data_to.push_back(std::move(data_from[i]));
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79 | }
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80 |
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81 | if (do_count_cleanup_time) {
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82 | data_to.clear();
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83 | data_from.clear();
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84 | }
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85 | }
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86 |
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87 | std::cout << "#############################################\n";
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88 |
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89 | data_from.clear();
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90 | data_from.resize(c_run_count, hello2);
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91 | data_to.clear();
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92 | data_to.resize(c_run_count, hello2);
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93 | {
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94 | scope sc("boost::variant=(const variant&) copying speed on same types");
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95 | for (std::size_t i = 0; i < c_run_count; ++i) {
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96 | data_to[i] = data_from[i];
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97 | }
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98 |
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99 | if (do_count_cleanup_time) {
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100 | data_to.clear();
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101 | data_from.clear();
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102 | }
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103 | }
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104 |
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105 | data_from.resize(c_run_count, hello2);
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106 | data_to.clear();
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107 | data_to.resize(c_run_count, hello2);
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108 | {
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109 | scope sc("boost::variant=(variant&&) moving speed on same types");
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110 | for (std::size_t i = 0; i < c_run_count; ++i) {
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111 | data_to[i] = std::move(data_from[i]);
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112 | }
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113 |
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114 | if (do_count_cleanup_time) {
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115 | data_to.clear();
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116 | data_from.clear();
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117 | }
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118 | }
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119 |
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120 | std::cout << "#############################################\n";
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121 |
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122 | data_from.clear();
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123 | data_from.resize(c_run_count, hello2);
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124 |
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125 | data_to.clear();
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126 | data_to.resize(c_run_count, var_t(0));
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127 | {
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128 | scope sc("boost::variant=(const variant&) copying speed on different types");
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129 | for (std::size_t i = 0; i < c_run_count; ++i) {
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130 | data_to[i] = data_from[i];
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131 | }
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132 |
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133 | if (do_count_cleanup_time) {
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134 | data_to.clear();
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135 | data_from.clear();
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136 | }
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137 | }
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138 |
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139 | data_from.resize(c_run_count, hello2);
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140 | data_to.clear();
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141 | data_to.resize(c_run_count, var_t(0));
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142 | {
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143 | scope sc("boost::variant=(variant&&) moving speed on different types");
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144 | for (std::size_t i = 0; i < c_run_count; ++i) {
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145 | data_to[i] = std::move(data_from[i]);
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146 | }
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147 |
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148 | if (do_count_cleanup_time) {
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149 | data_to.clear();
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150 | data_from.clear();
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151 | }
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152 | }
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153 |
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154 | std::cout << "#############################################\n";
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155 |
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156 | data_from.clear();
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157 | data_from.resize(c_run_count, var_t(0));
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158 |
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159 | data_to.clear();
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160 | data_to.resize(c_run_count, hello2);
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161 | {
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162 | scope sc("boost::variant=(const variant&) copying speed on different types II");
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163 | for (std::size_t i = 0; i < c_run_count; ++i) {
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164 | data_to[i] = data_from[i];
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165 | }
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166 |
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167 | if (do_count_cleanup_time) {
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168 | data_to.clear();
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169 | data_from.clear();
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170 | }
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171 | }
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172 |
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173 | data_from.resize(c_run_count, var_t(0));
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174 | data_to.clear();
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175 | data_to.resize(c_run_count, hello2);
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176 | {
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177 | scope sc("boost::variant=(variant&&) moving speed on different types II");
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178 | for (std::size_t i = 0; i < c_run_count; ++i) {
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179 | data_to[i] = std::move(data_from[i]);
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180 | }
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181 |
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182 | if (do_count_cleanup_time) {
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183 | data_to.clear();
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184 | data_from.clear();
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185 | }
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186 | }
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187 |
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188 |
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189 | std::cout << "#############################################\n";
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190 |
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191 | std::vector<str_t> s1(c_run_count, hello2);
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192 | data_to.clear();
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193 | data_to.resize(c_run_count, var_t(0));
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194 |
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195 | {
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196 | scope sc("boost::variant=(const T&) copying speed");
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197 | for (std::size_t i = 0; i < c_run_count; ++i) {
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198 | data_to[i] = s1[i];
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199 | }
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200 |
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201 | if (do_count_cleanup_time) {
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202 | data_to.clear();
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203 | s1.clear();
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204 | }
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205 | }
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206 |
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207 | std::vector<str_t> s2(c_run_count, hello2);
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208 | data_to.clear();
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209 | data_to.resize(c_run_count, var_t(0));
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210 | {
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211 | scope sc("boost::variant=(T&&) moving speed");
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212 | for (std::size_t i = 0; i < c_run_count; ++i) {
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213 | data_to[i] = std::move(s2[i]);
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214 | }
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215 |
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216 | if (do_count_cleanup_time) {
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217 | data_to.clear();
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218 | s2.clear();
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219 | }
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220 | }
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221 | }
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222 |
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223 |
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224 | int main () {
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225 | do_test(false);
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226 | do_test(true);
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227 | }
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228 |
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229 |
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