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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<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
from this Library: Compiler and Compiler Options</a>
</h2></div></div></div>
<p>
By far the most important thing you can do when using this library is turn
on your compiler's optimisation options. As the following table shows the penalty
for using the library in debug mode can be quite large. In addition switching
to 64-bit code has a small but noticeable improvement in performance, as does
switching to a different compiler (Intel C++ 15 in this example).
</p>
<div class="table">
<a name="math_toolkit.getting_best.table_Compiler_Option_Comparison_on_Windows_x64"></a><p class="title"><b>Table 23.1. Compiler Option Comparison on Windows x64</b></p>
<div class="table-contents"><table class="table" summary="Compiler Option Comparison on Windows x64">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Function
</p>
</th>
<th>
<p>
cl /Od (x86 build)
</p>
</th>
<th>
<p>
cl /arch:sse2 /Ox (x86 build)
</p>
</th>
<th>
<p>
cl /Ox (x64 build)
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
boost::math::cbrt
</p>
</td>
<td>
<p>
<span class="red">5.05<br> (202ns)</span>
</p>
</td>
<td>
<p>
<span class="green">1.20<br> (48ns)</span>
</p>
</td>
<td>
<p>
<span class="green">1.00<br> (40ns)</span>
</p>
</td>
</tr>
<tr>
<td>
<p>
boost::math::cyl_bessel_j (integer orders)
</p>
</td>
<td>
<p>
<span class="red">4.38<br> (530ns)</span>
</p>
</td>
<td>
<p>
<span class="green">1.00<br> (121ns)</span>
</p>
</td>
<td>
<p>
<span class="green">1.02<br> (124ns)</span>
</p>
</td>
</tr>
<tr>
<td>
<p>
boost::math::ibeta_inv
</p>
</td>
<td>
<p>
<span class="red">4.52<br> (8277ns)</span>
</p>
</td>
<td>
<p>
<span class="green">1.11<br> (2042ns)</span>
</p>
</td>
<td>
<p>
<span class="green">1.00<br> (1833ns)</span>
</p>
</td>
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<div class="copyright-footer">Copyright © 2006-2021 Nikhar Agrawal, Anton Bikineev, Matthew Borland,
Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert Holin, Bruno
Lalande, John Maddock, Evan Miller, Jeremy Murphy, Matthew Pulver, Johan Råde,
Gautam Sewani, Benjamin Sobotta, Nicholas Thompson, Thijs van den Berg, Daryle
Walker and Xiaogang Zhang<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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