1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Comparing the performance of a single int_ generator</title> 5<link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../../index.html" title="Spirit 2.5.8"> 8<link rel="up" href="../numeric_performance.html" title="Performance of Numeric Generators"> 9<link rel="prev" href="../numeric_performance.html" title="Performance of Numeric Generators"> 10<link rel="next" href="double_performance.html" title="Comparing the performance of a single double_ generator"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="../numeric_performance.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../numeric_performance.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="double_performance.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="spirit.karma.performance_measurements.numeric_performance.int_performance"></a><a class="link" href="int_performance.html" title="Comparing the performance of a single int_ generator">Comparing 28 the performance of a single int_ generator</a> 29</h5></div></div></div> 30<p> 31 These performance measurements are centered around default formatting 32 of a single <code class="computeroutput"><span class="keyword">int</span></code> integer 33 number using different libraries and methods. The overall execution times 34 for those examples are compared below. We compare using <code class="computeroutput"><span class="identifier">sprintf</span></code>, C++ iostreams, <a href="../../../../../../../../libs/format/index.html" target="_top">Boost.Format</a>, 35 and <span class="emphasis"><em>Spirit.Karma</em></span>. 36 </p> 37<p> 38 For the full source code of the performance test please see here: <a href="../../../../../../workbench/karma/int_generator.cpp" target="_top">int_generator.cpp</a>. 39 All the measurements have been done by executing <code class="computeroutput"><span class="number">1e7</span></code> 40 iterations for each formatting type (NUMITERATIONS is set to <code class="computeroutput"><span class="number">1e7</span></code> in the code shown below). 41 </p> 42<p> 43 Code used to measure the performance for <code class="computeroutput"><span class="identifier">ltoa</span></code>: 44 </p> 45<p> 46</p> 47<pre class="programlisting"><span class="keyword">char</span> <span class="identifier">buffer</span><span class="special">[</span><span class="number">65</span><span class="special">];</span> <span class="comment">// we don't expect more than 64 bytes to be generated here</span> 48<span class="keyword">for</span> <span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">MAX_ITERATION</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> 49<span class="special">{</span> 50 <span class="identifier">ltoa</span><span class="special">(</span><span class="identifier">v</span><span class="special">[</span><span class="identifier">i</span><span class="special">],</span> <span class="identifier">buffer</span><span class="special">,</span> <span class="number">10</span><span class="special">);</span> 51<span class="special">}</span> 52</pre> 53<p> 54 </p> 55<p> 56 Code used to measure the performance for standard C++ iostreams: 57 </p> 58<p> 59</p> 60<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">stringstream</span> <span class="identifier">str</span><span class="special">;</span> 61<span class="keyword">for</span> <span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">MAX_ITERATION</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> 62<span class="special">{</span> 63 <span class="identifier">str</span><span class="special">.</span><span class="identifier">str</span><span class="special">(</span><span class="string">""</span><span class="special">);</span> 64 <span class="identifier">str</span> <span class="special"><<</span> <span class="identifier">v</span><span class="special">[</span><span class="identifier">i</span><span class="special">];</span> 65<span class="special">}</span> 66</pre> 67<p> 68 </p> 69<p> 70 Code used to measure the performance for <a href="../../../../../../../../libs/format/index.html" target="_top">Boost.Format</a>: 71 </p> 72<p> 73</p> 74<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">str</span><span class="special">;</span> 75<span class="identifier">boost</span><span class="special">::</span><span class="identifier">format</span> <span class="identifier">int_format</span><span class="special">(</span><span class="string">"%d"</span><span class="special">);</span> 76<span class="keyword">for</span> <span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">MAX_ITERATION</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> 77<span class="special">{</span> 78 <span class="identifier">str</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">str</span><span class="special">(</span><span class="identifier">int_format</span> <span class="special">%</span> <span class="identifier">v</span><span class="special">[</span><span class="identifier">i</span><span class="special">]);</span> 79<span class="special">}</span> 80</pre> 81<p> 82 </p> 83<p> 84 Code used to measure the performance for <span class="emphasis"><em>Spirit.Karma</em></span> 85 using a plain character buffer: 86 </p> 87<p> 88</p> 89<pre class="programlisting"><span class="keyword">char</span> <span class="identifier">buffer</span><span class="special">[</span><span class="number">65</span><span class="special">];</span> <span class="comment">// we don't expect more than 64 bytes to be generated here</span> 90<span class="keyword">for</span> <span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">MAX_ITERATION</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> 91<span class="special">{</span> 92 <span class="keyword">char</span> <span class="special">*</span><span class="identifier">ptr</span> <span class="special">=</span> <span class="identifier">buffer</span><span class="special">;</span> 93 <span class="identifier">karma</span><span class="special">::</span><span class="identifier">generate</span><span class="special">(</span><span class="identifier">ptr</span><span class="special">,</span> <span class="identifier">int_</span><span class="special">,</span> <span class="identifier">v</span><span class="special">[</span><span class="identifier">i</span><span class="special">]);</span> 94 <span class="special">*</span><span class="identifier">ptr</span> <span class="special">=</span> <span class="char">'\0'</span><span class="special">;</span> 95<span class="special">}</span> 96</pre> 97<p> 98 </p> 99<p> 100 The following table shows the overall performance results collected while 101 using different compilers. All times are in seconds measured for <code class="computeroutput"><span class="number">1e7</span></code> iterations (platform: Windows7, Intel 102 Core Duo(tm) Processor, 2.8GHz, 4GByte RAM). For a more readable comparison 103 of the results see this <a class="link" href="int_performance.html#spirit.karma.int_performance" title="Figure 3. Performance comparison for a single int">figure</a>. 104 </p> 105<div class="table"> 106<a name="spirit.karma.performance_measurements.numeric_performance.int_performance.performance_comparison_for_a_single_int__all_times_in__s____1e7__iterations_"></a><p class="title"><b>Table 5. Performance comparison for a single int (all times in [s], `1e7` 107 iterations)</b></p> 108<div class="table-contents"><table class="table" summary="Performance comparison for a single int (all times in [s], `1e7` 109 iterations)"> 110<colgroup> 111<col> 112<col> 113<col> 114<col> 115<col> 116<col> 117<col> 118</colgroup> 119<thead><tr> 120<th> 121 <p> 122 Library 123 </p> 124 </th> 125<th> 126 <p> 127 gcc 4.4.0 (32 bit) 128 </p> 129 </th> 130<th> 131 <p> 132 VC++ 10 (32 bit) 133 </p> 134 </th> 135<th> 136 <p> 137 Intel 11.1 (32 bit) 138 </p> 139 </th> 140<th> 141 <p> 142 gcc 4.4.0 (64 bit) 143 </p> 144 </th> 145<th> 146 <p> 147 VC++ 10 (64 bit) 148 </p> 149 </th> 150<th> 151 <p> 152 Intel 11.1 (64 bit) 153 </p> 154 </th> 155</tr></thead> 156<tbody> 157<tr> 158<td> 159 <p> 160 ltoa 161 </p> 162 </td> 163<td> 164 <p> 165 1.542 166 </p> 167 </td> 168<td> 169 <p> 170 0.895 171 </p> 172 </td> 173<td> 174 <p> 175 0.884 176 </p> 177 </td> 178<td> 179 <p> 180 1.163 181 </p> 182 </td> 183<td> 184 <p> 185 1.099 186 </p> 187 </td> 188<td> 189 <p> 190 0.906 191 </p> 192 </td> 193</tr> 194<tr> 195<td> 196 <p> 197 iostreams 198 </p> 199 </td> 200<td> 201 <p> 202 6.548 203 </p> 204 </td> 205<td> 206 <p> 207 13.727 208 </p> 209 </td> 210<td> 211 <p> 212 11.898 213 </p> 214 </td> 215<td> 216 <p> 217 3.464 218 </p> 219 </td> 220<td> 221 <p> 222 8.316 223 </p> 224 </td> 225<td> 226 <p> 227 8.115 228 </p> 229 </td> 230</tr> 231<tr> 232<td> 233 <p> 234 <a href="../../../../../../../../libs/format/index.html" target="_top">Boost.Format</a> 235 </p> 236 </td> 237<td> 238 <p> 239 16.998 240 </p> 241 </td> 242<td> 243 <p> 244 21.813 245 </p> 246 </td> 247<td> 248 <p> 249 20.477 250 </p> 251 </td> 252<td> 253 <p> 254 17.464 255 </p> 256 </td> 257<td> 258 <p> 259 14.662 260 </p> 261 </td> 262<td> 263 <p> 264 13.646 265 </p> 266 </td> 267</tr> 268<tr> 269<td> 270 <p> 271 <span class="emphasis"><em>Spirit.Karma</em></span> int_ 272 </p> 273 </td> 274<td> 275 <p> 276 1.421 277 </p> 278 </td> 279<td> 280 <p> 281 0.744 282 </p> 283 </td> 284<td> 285 <p> 286 0.697 287 </p> 288 </td> 289<td> 290 <p> 291 1.072 292 </p> 293 </td> 294<td> 295 <p> 296 0.953 297 </p> 298 </td> 299<td> 300 <p> 301 0.606 302 </p> 303 </td> 304</tr> 305</tbody> 306</table></div> 307</div> 308<br class="table-break"><p> 309 </p> 310<div class="figure"> 311<a name="spirit.karma.int_performance"></a><p class="title"><b>Figure 3. Performance comparison for a single int</b></p> 312<div class="figure-contents"><span class="inlinemediaobject"><img src="../../../.././images/int_performance.png" alt="Performance comparison for a single int"></span></div> 313</div> 314<p><br class="figure-break"> 315 </p> 316</div> 317<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 318<td align="left"></td> 319<td align="right"><div class="copyright-footer">Copyright © 2001-2011 Joel de Guzman, Hartmut Kaiser<p> 320 Distributed under the Boost Software License, Version 1.0. (See accompanying 321 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 322 </p> 323</div></td> 324</tr></table> 325<hr> 326<div class="spirit-nav"> 327<a accesskey="p" href="../numeric_performance.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../numeric_performance.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="double_performance.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 328</div> 329</body> 330</html> 331
