158 lines
5.8 KiB
HTML
158 lines
5.8 KiB
HTML
<html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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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 22. Performance">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td>
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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 22.1. 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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</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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</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">5.05<br> (202ns)</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">1.20<br> (48ns)</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> (40ns)</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">4.38<br> (530ns)</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> (121ns)</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">1.02<br> (124ns)</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">4.52<br> (8277ns)</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">1.11<br> (2042ns)</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> (1833ns)</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 © 2006-2021 Nikhar Agrawal, Anton Bikineev, Matthew Borland,
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Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert Holin, Bruno
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Lalande, John Maddock, Evan Miller, Jeremy Murphy, Matthew Pulver, Johan Råde,
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Gautam Sewani, Benjamin Sobotta, Nicholas Thompson, Thijs van den Berg, Daryle
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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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<hr>
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<a accesskey="p" href="interp.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../perf.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="tradoffs.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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