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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="metaparse.performance"></a><a class="link" href="performance.html" title="Performance">Performance</a>
</h2></div></div></div>
<p>
Parsers work at compile-time, thus their performance affects compilation speed.
This section shows measurements of compilation time using Metaparse. The measurements
were done on a Linux laptop with an 1.6 GHz Atom processor and 1 GB memory.
The measurements were done using GCC 4.6.1 with <code class="computeroutput"><span class="special">-</span><span class="identifier">std</span><span class="special">=</span><span class="identifier">c</span><span class="special">++</span><span class="number">0</span><span class="identifier">x</span></code>
and no optimisation. Compilation speed was measured using the <code class="computeroutput"><span class="identifier">time</span></code> utility.
</p>
<p>
To measure a non-trivial parser, the <code class="computeroutput"><span class="identifier">printf</span></code>
example program were used for measurements. Here is a list of the <code class="computeroutput"><span class="identifier">printf</span></code> calls and their compilation speed
(<code class="computeroutput"><span class="identifier">user</span></code> output of <code class="computeroutput"><span class="identifier">time</span></code>):
</p>
<div class="table">
<a name="metaparse.performance.printf_compilation_speed"></a><p class="title"><b>Table 20.1. Printf compilation speed</b></p>
<div class="table-contents"><table class="table" summary="Printf compilation speed">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
type-safe <code class="computeroutput"><span class="identifier">printf</span></code>
call
</p>
</th>
<th>
<p>
Compilation speed (s)
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
No compile-time parsing (just the includes and an empty <code class="computeroutput"><span class="identifier">main</span></code>)
</p>
</td>
<td>
<p>
3.51
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">printf</span><span class="special"><</span><span class="identifier">BOOST_METAPARSE_STRING</span><span class="special">(</span><span class="string">"%f"</span><span class="special">)>(</span><span class="number">1.0</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
4.95
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">printf</span><span class="special"><</span><span class="identifier">BOOST_METAPARSE_STRING</span><span class="special">(</span><span class="string">"%f%f"</span><span class="special">)>(</span><span class="number">1.0</span><span class="special">,</span> <span class="number">2.0</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
5.26
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">printf</span><span class="special"><</span><span class="identifier">BOOST_METAPARSE_STRING</span><span class="special">(</span><span class="string">"%f%f%f"</span><span class="special">)>(</span><span class="number">1.0</span><span class="special">,</span> <span class="number">2.0</span><span class="special">,</span> <span class="number">3.0</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
5.50
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">printf</span><span class="special"><</span><span class="identifier">BOOST_METAPARSE_STRING</span><span class="special">(</span><span class="string">"%f%f%f%f"</span><span class="special">)>(</span><span class="number">1.0</span><span class="special">,</span> <span class="number">2.0</span><span class="special">,</span> <span class="number">3.0</span><span class="special">,</span> <span class="number">4.0</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
5.82
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">printf</span><span class="special"><</span><span class="identifier">BOOST_METAPARSE_STRING</span><span class="special">(</span><span class="string">"%f%f%f%f%f"</span><span class="special">)>(</span><span class="number">1.0</span><span class="special">,</span> <span class="number">2.0</span><span class="special">,</span> <span class="number">3.0</span><span class="special">,</span> <span class="number">4.0</span><span class="special">,</span> <span class="number">5.0</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
6.07
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><p>
Further measurements can be found in the following paper:
</p>
<p>
Zoltán Porkoláb, Ábel Sinkovics: <br> <span class="bold"><strong>Domain-specific
Language Integration with Compile-time Parser Generator Library</strong></span>
<br> In Eelco Visser, Jaakko Järvi, editors, Proceedings of the ninth international
conference on Generative programming and component engineering (GPCE 2010).
ACM, October 2010, pp. 137-146.
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2015 Abel Sinkovics<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>)
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