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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<title>Getting the Best Performance from this Library: Compiler and Compiler Options</title>
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<link rel="up" href="../perf.html" title="Chapter 16. Performance">
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<table cellpadding="2" width="100%"><tr>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="math_toolkit.getting_best"></a><a class="link" href="getting_best.html" title="Getting the Best Performance from this Library: Compiler and Compiler Options">Getting the Best Performance
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from this Library: Compiler and Compiler Options</a>
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</h2></div></div></div>
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<p>
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By far the most important thing you can do when using this library is turn
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on your compiler's optimisation options. As the following table shows the penalty
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for using the library in debug mode can be quite large. In addition switching
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to 64-bit code has a small but noticeable improvement in performance, as does
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switching to a different compiler (Intel C++ 15 in this example).
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</p>
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<div class="table">
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<a name="math_toolkit.getting_best.table_Compiler_Option_Comparison_on_Windows_x64"></a><p class="title"><b>Table 16.1. Compiler Option Comparison on Windows x64</b></p>
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<div class="table-contents"><table class="table" summary="Compiler Option Comparison on Windows x64">
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<colgroup>
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<col>
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<col>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Function
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</p>
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</th>
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<th>
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<p>
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cl /Od (x86 build)
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</p>
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</th>
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<th>
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<p>
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cl /arch:sse2 /Ox (x86 build)
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</p>
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</th>
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<th>
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<p>
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cl /Ox (x64 build)
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</p>
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</th>
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<th>
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<p>
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icl /Ox (x64 build)
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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boost::math::cbrt
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</p>
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</td>
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<td>
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<p>
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<span class="red">18.29<br> (256ns)</span>
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</p>
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</td>
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<td>
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<p>
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<span class="red">4.29<br> (60ns)</span>
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</p>
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</td>
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<td>
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<p>
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<span class="red">3.14<br> (44ns)</span>
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</p>
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</td>
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<td>
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<p>
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<span class="green">1.00<br> (14ns)</span>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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boost::math::cyl_bessel_j (integer orders)
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</p>
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</td>
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<td>
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<p>
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<span class="red">10.03<br> (742ns)</span>
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</p>
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</td>
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<td>
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<p>
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<span class="blue">1.77<br> (131ns)</span>
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</p>
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</td>
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<td>
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<p>
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<span class="blue">1.36<br> (101ns)</span>
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</p>
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</td>
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<td>
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<p>
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<span class="green">1.00<br> (74ns)</span>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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boost::math::ibeta_inv
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</p>
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</td>
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<td>
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<p>
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<span class="red">4.32<br> (6583ns)</span>
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</p>
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</td>
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<td>
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<p>
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<span class="blue">1.29<br> (1963ns)</span>
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</p>
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</td>
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<td>
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<p>
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<span class="blue">1.28<br> (1957ns)</span>
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</p>
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</td>
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<td>
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<p>
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<span class="green">1.00<br> (1523ns)</span>
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2006-2010, 2012-2014 Nikhar Agrawal,
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Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert
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Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan Råde, Gautam Sewani,
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Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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