<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Comparing the performance of a sequence of several generators</title> <link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.0"> <link rel="home" href="../../../../index.html" title="Spirit 2.4"> <link rel="up" href="../numeric_performance.html" title="Performance of Numeric Generators"> <link rel="prev" href="double_performance.html" title="Comparing the performance of a single double_ generator"> <link rel="next" href="../../../lex.html" title="Lex - Writing Lexical Analyzers"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> <td align="center"><a href="../../../../../../../../index.html">Home</a></td> <td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="double_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="../../../lex.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h5 class="title"> <a name="spirit.karma.performance_measurements.numeric_performance.format_performance"></a><a class="link" href="format_performance.html" title="Comparing the performance of a sequence of several generators"> Comparing the performance of a sequence of several generators</a> </h5></div></div></div> <p> These performance measurements are centered around formatting of a sequence of different items, including 2 <code class="computeroutput"><span class="keyword">double</span></code> floating point numbers using different libraries and methods. The overall execution times 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>, and <span class="emphasis"><em>Spirit.Karma</em></span>. </p> <p> For the full source code of the performance test please see here: <a href="../../../../../../optimization/karma/format_performance.cpp" target="_top">format_performance.cpp</a>. All the measurements have been done by doing <code class="computeroutput"><span class="number">1e6</span></code> iterations for each formatting type (NUMITERATIONS is set to <code class="computeroutput"><span class="number">1e6</span></code>). </p> <p> Code used to measure the performance for sprintf: </p> <p> </p> <pre class="programlisting"><span class="keyword">char</span> <span class="identifier">buffer</span><span class="special">[</span><span class="number">256</span><span class="special">];</span> <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">NUMITERATIONS</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">sprintf</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span> <span class="string">"[%-14.3f%-14.3f]"</span><span class="special">,</span> <span class="number">12345.12345</span><span class="special">,</span> <span class="number">12345.12345</span><span class="special">);</span> <span class="special">}</span> </pre> <p> </p> <p> Code used to measure the performance for standard iostreams: </p> <p> </p> <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">stringstream</span> <span class="identifier">strm</span><span class="special">;</span> <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">NUMITERATIONS</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">strm</span><span class="special">.</span><span class="identifier">str</span><span class="special">(</span><span class="string">""</span><span class="special">);</span> <span class="identifier">strm</span> <span class="special"><<</span> <span class="char">'['</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">setiosflags</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios</span><span class="special">::</span><span class="identifier">fixed</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">left</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">setprecision</span><span class="special">(</span><span class="number">3</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">setw</span><span class="special">(</span><span class="number">14</span><span class="special">)</span> <span class="special"><<</span> <span class="number">12345.12345</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">setw</span><span class="special">(</span><span class="number">14</span><span class="special">)</span> <span class="special"><<</span> <span class="number">12345.12345</span> <span class="special"><<</span> <span class="char">']'</span><span class="special">;</span> <span class="special">}</span> </pre> <p> </p> <p> Code used to measure the performance for <a href="../../../../../../../../libs/format/index.html" target="_top">Boost.Format</a>: </p> <p> </p> <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">generated</span><span class="special">;</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">format</span> <span class="identifier">outformat</span><span class="special">(</span><span class="string">"[%-14.3f%-14.3f]"</span><span class="special">);</span> <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">NUMITERATIONS</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">generated</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">outformat</span> <span class="special">%</span> <span class="number">12345.12345</span> <span class="special">%</span> <span class="number">12345.12345</span><span class="special">);</span> </pre> <p> </p> <p> The following code shows the common definitions used by all <span class="emphasis"><em>Spirit.Karma</em></span> performance measurements as listed below: </p> <p> </p> <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">double3_policy</span> <span class="special">:</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">karma</span><span class="special">::</span><span class="identifier">real_policies</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">{</span> <span class="comment">// we want to generate up to 3 fractional digits </span> <span class="keyword">static</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">precision</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="number">3</span><span class="special">;</span> <span class="special">}</span> <span class="special">};</span> <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">karma</span><span class="special">::</span><span class="identifier">real_generator</span><span class="special"><</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">double3_policy</span><span class="special"><</span><span class="keyword">double</span><span class="special">></span> <span class="special">></span> <span class="identifier">double3_type</span><span class="special">;</span> <span class="identifier">double3_type</span> <span class="keyword">const</span> <span class="identifier">double3</span> <span class="special">=</span> <span class="identifier">double3_type</span><span class="special">();</span> </pre> <p> </p> <p> Code used to measure the performance for <span class="emphasis"><em>Spirit.Karma</em></span> using a plain character buffer: </p> <p> </p> <pre class="programlisting"><span class="keyword">char</span> <span class="identifier">buffer</span><span class="special">[</span><span class="number">256</span><span class="special">];</span> <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">NUMITERATIONS</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">char</span> <span class="special">*</span><span class="identifier">p</span> <span class="special">=</span> <span class="identifier">buffer</span><span class="special">;</span> <span class="identifier">generate</span><span class="special">(</span><span class="identifier">p</span> <span class="special">,</span> <span class="char">'['</span> <span class="special"><<</span> <span class="identifier">left_align</span><span class="special">(</span><span class="number">14</span><span class="special">)[</span><span class="identifier">double3</span><span class="special">]</span> <span class="special"><<</span> <span class="identifier">left_align</span><span class="special">(</span><span class="number">14</span><span class="special">)[</span><span class="identifier">double3</span><span class="special">]</span> <span class="special"><<</span> <span class="char">']'</span> <span class="special">,</span> <span class="number">12345.12345</span><span class="special">,</span> <span class="number">12345.12345</span><span class="special">);</span> <span class="special">*</span><span class="identifier">p</span> <span class="special">=</span> <span class="char">'\0'</span><span class="special">;</span> <span class="special">}</span> </pre> <p> </p> <p> The following table shows the overall performance results collected while using different compilers. All times are in seconds measured for <code class="computeroutput"><span class="number">1e6</span></code> iterations (platform: Windows7, Intel Core Duo(tm) Processor, 2.8GHz, 4GByte RAM). For a more readable comparison of the results see this <a class="link" href="format_performance.html#spirit.karma.format_performance" title="Figure 5. Performance comparison for a sequence of several items">figure</a>. </p> <div class="table"> <a name="id1158803"></a><p class="title"><b>Table 7. Performance comparison for a sequence of several items (all times in [s], `1e6` iterations)</b></p> <div class="table-contents"><table class="table" summary="Performance comparison for a sequence of several items (all times in [s], `1e6` iterations)"> <colgroup> <col> <col> <col> <col> <col> <col> <col> </colgroup> <thead><tr> <th> <p> Library </p> </th> <th> <p> gcc 4.4.0 (32 bit) </p> </th> <th> <p> VC++ 10 (32 bit) </p> </th> <th> <p> Intel 11.1 (32 bit) </p> </th> <th> <p> gcc 4.4.0 (64 bit) </p> </th> <th> <p> VC++ 10 (64 bit) </p> </th> <th> <p> Intel 11.1 (64 bit) </p> </th> </tr></thead> <tbody> <tr> <td> <p> sprintf </p> </td> <td> <p> 1.725 </p> </td> <td> <p> 1.892 </p> </td> <td> <p> 1.903 </p> </td> <td> <p> 1.469 </p> </td> <td> <p> 1.608 </p> </td> <td> <p> 1.493 </p> </td> </tr> <tr> <td> <p> iostreams </p> </td> <td> <p> 4.827 </p> </td> <td> <p> 5.287 </p> </td> <td> <p> 4.444 </p> </td> <td> <p> 3.112 </p> </td> <td> <p> 3.319 </p> </td> <td> <p> 2.877 </p> </td> </tr> <tr> <td> <p> <a href="../../../../../../../../libs/format/index.html" target="_top">Boost.Format</a> </p> </td> <td> <p> 5.881 </p> </td> <td> <p> 7.089 </p> </td> <td> <p> 5.801 </p> </td> <td> <p> 5.455 </p> </td> <td> <p> 5.254 </p> </td> <td> <p> 4.164 </p> </td> </tr> <tr> <td> <p> <span class="emphasis"><em>Spirit.Karma</em></span> </p> </td> <td> <p> 1.942 </p> </td> <td> <p> 1.242 </p> </td> <td> <p> 0.999 </p> </td> <td> <p> 1.334 </p> </td> <td> <p> 0.758 </p> </td> <td> <p> 0.686 </p> </td> </tr> </tbody> </table></div> </div> <br class="table-break"><p> </p> <div class="figure"> <a name="spirit.karma.format_performance"></a><p class="title"><b>Figure 5. Performance comparison for a sequence of several items</b></p> <div class="figure-contents"><span class="inlinemediaobject"><img src="../../../.././images/format_performance.png" alt="Performance comparison for a sequence of several items"></span></div> </div> <p><br class="figure-break"> </p> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2001-2010 Joel de Guzman, Hartmut Kaiser<p> Distributed under the Boost Software License, Version 1.0. (See accompanying 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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="double_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="../../../lex.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>