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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="math_toolkit.main_overview.perf_over"></a><a class="link" href="perf_over.html" title="Performance"> Performance</a> |
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| By and large the performance of this library should be acceptable for most |
| needs. However, you should note that this library's primary emphasis is |
| on accuracy and numerical stability, and <span class="emphasis"><em>not</em></span> speed. |
| </p> |
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| In terms of the algorithms used, this library aims to use the same "best |
| of breed" algorithms as many other libraries: the principle difference |
| is that this library is implemented in C++ - taking advantage of all the |
| abstraction mechanisms that C++ offers - where as most traditional numeric |
| libraries are implemented in C or FORTRAN. Traditionally languages such |
| as C or FORTRAN are perceived as easier to optimise than more complex languages |
| like C++, so in a sense this library provides a good test of current compiler |
| technology, and the "abstraction penalty" - if any - of C++ compared |
| to other languages. |
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| The two most important things you can do to ensure the best performance |
| from this library are: |
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| <p> |
| </p> |
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| Turn on your compilers optimisations: the difference between "release" |
| and "debug" builds can easily be a <a class="link" href="../perf/getting_best.html" title="Getting the Best Performance from this Library">factor |
| of 20</a>. |
| </li> |
| <li> |
| Pick your compiler carefully: <a class="link" href="../perf/comp_compilers.html" title="Comparing Compilers">performance |
| differences of up to 8 fold</a> have been found between some Windows |
| compilers for example. |
| </li> |
| </ol></div> |
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| <p> |
| The <a class="link" href="../perf.html" title="Performance">performance section</a> contains |
| more information on the performance of this library, what you can do to |
| fine tune it, and how this library compares to some other open source alternatives. |
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| <td align="right"><div class="copyright-footer">Copyright © 2006 , 2007, 2008, 2009, 2010 John Maddock, Paul A. Bristow, |
| Hubert Holin, Xiaogang Zhang, Bruno Lalande, Johan Råde, Gautam Sewani and |
| Thijs van den Berg<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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