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| <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="id1114684"></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> |
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