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26<div class="titlepage"><div><div><h2 class="title" style="clear: both">
27<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
28 from this Library: Compiler and Compiler Options</a>
29</h2></div></div></div>
30<p>
31 By far the most important thing you can do when using this library is turn
32 on your compiler's optimisation options. As the following table shows the penalty
33 for using the library in debug mode can be quite large. In addition switching
34 to 64-bit code has a small but noticeable improvement in performance, as does
35 switching to a different compiler (Intel C++ 15 in this example).
36 </p>
37<div class="table">
38<a name="math_toolkit.getting_best.table_Compiler_Option_Comparison_on_Windows_x64"></a><p class="title"><b>Table&#160;16.1.&#160;Compiler Option Comparison on Windows x64</b></p>
39<div class="table-contents"><table class="table" summary="Compiler Option Comparison on Windows x64">
40<colgroup>
41<col>
42<col>
43<col>
44<col>
45<col>
46</colgroup>
47<thead><tr>
48<th>
49 <p>
50 Function
51 </p>
52 </th>
53<th>
54 <p>
55 cl /Od (x86 build)
56 </p>
57 </th>
58<th>
59 <p>
60 cl /arch:sse2 /Ox (x86 build)
61 </p>
62 </th>
63<th>
64 <p>
65 cl /Ox (x64 build)
66 </p>
67 </th>
68<th>
69 <p>
70 icl /Ox (x64 build)
71 </p>
72 </th>
73</tr></thead>
74<tbody>
75<tr>
76<td>
77 <p>
78 boost::math::cbrt
79 </p>
80 </td>
81<td>
82 <p>
83 <span class="red">18.29<br> (256ns)</span>
84 </p>
85 </td>
86<td>
87 <p>
88 <span class="red">4.29<br> (60ns)</span>
89 </p>
90 </td>
91<td>
92 <p>
93 <span class="red">3.14<br> (44ns)</span>
94 </p>
95 </td>
96<td>
97 <p>
98 <span class="green">1.00<br> (14ns)</span>
99 </p>
100 </td>
101</tr>
102<tr>
103<td>
104 <p>
105 boost::math::cyl_bessel_j (integer orders)
106 </p>
107 </td>
108<td>
109 <p>
110 <span class="red">10.03<br> (742ns)</span>
111 </p>
112 </td>
113<td>
114 <p>
115 <span class="blue">1.77<br> (131ns)</span>
116 </p>
117 </td>
118<td>
119 <p>
120 <span class="blue">1.36<br> (101ns)</span>
121 </p>
122 </td>
123<td>
124 <p>
125 <span class="green">1.00<br> (74ns)</span>
126 </p>
127 </td>
128</tr>
129<tr>
130<td>
131 <p>
132 boost::math::ibeta_inv
133 </p>
134 </td>
135<td>
136 <p>
137 <span class="red">4.32<br> (6583ns)</span>
138 </p>
139 </td>
140<td>
141 <p>
142 <span class="blue">1.29<br> (1963ns)</span>
143 </p>
144 </td>
145<td>
146 <p>
147 <span class="blue">1.28<br> (1957ns)</span>
148 </p>
149 </td>
150<td>
151 <p>
152 <span class="green">1.00<br> (1523ns)</span>
153 </p>
154 </td>
155</tr>
156</tbody>
157</table></div>
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163<td align="right"><div class="copyright-footer">Copyright &#169; 2006-2010, 2012-2014 Nikhar Agrawal,
164 Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert
165 Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan R&#229;de, Gautam Sewani,
166 Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang<p>
167 Distributed under the Boost Software License, Version 1.0. (See accompanying
168 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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