119 lines
5.4 KiB
HTML
119 lines
5.4 KiB
HTML
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
|
|
<title>Algorithm Tuning</title>
|
|
<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css">
|
|
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
|
|
<link rel="home" href="../../index.html" title="Boost.Regex 5.1.4">
|
|
<link rel="up" href="../configuration.html" title="Configuration">
|
|
<link rel="prev" href="locale.html" title="Locale and traits class selection">
|
|
<link rel="next" href="../install.html" title="Building and Installing the Library">
|
|
</head>
|
|
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
|
<table cellpadding="2" width="100%"><tr>
|
|
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td>
|
|
<td align="center"><a href="../../../../../../index.html">Home</a></td>
|
|
<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td>
|
|
<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
|
|
<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
|
|
<td align="center"><a href="../../../../../../more/index.htm">More</a></td>
|
|
</tr></table>
|
|
<hr>
|
|
<div class="spirit-nav">
|
|
<a accesskey="p" href="locale.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../configuration.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="../install.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
|
|
</div>
|
|
<div class="section">
|
|
<div class="titlepage"><div><div><h3 class="title">
|
|
<a name="boost_regex.configuration.tuning"></a><a class="link" href="tuning.html" title="Algorithm Tuning">Algorithm Tuning</a>
|
|
</h3></div></div></div>
|
|
<div class="informaltable"><table class="table">
|
|
<colgroup>
|
|
<col>
|
|
<col>
|
|
</colgroup>
|
|
<thead><tr>
|
|
<th>
|
|
<p>
|
|
macro
|
|
</p>
|
|
</th>
|
|
<th>
|
|
<p>
|
|
description
|
|
</p>
|
|
</th>
|
|
</tr></thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
BOOST_REGEX_BLOCKSIZE
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
Boost.Regex uses largish blocks of memory to act as a stack for
|
|
the state machine, the larger the block size then the fewer allocations
|
|
that will take place. This defaults to 4096 bytes, which is large
|
|
enough to match the vast majority of regular expressions without
|
|
further allocations, however, you can choose smaller or larger
|
|
values depending upon your platforms characteristics.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
BOOST_REGEX_MAX_BLOCKS
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
Tells Boost.Regex how many blocks of size BOOST_REGEX_BLOCKSIZE
|
|
it is permitted to use. If this value is exceeded then Boost.Regex
|
|
will stop trying to find a match and throw a std::runtime_error.
|
|
Defaults to 1024, don't forget to tweak this value if you alter
|
|
BOOST_REGEX_BLOCKSIZE by much.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
BOOST_REGEX_MAX_CACHE_BLOCKS
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
Tells Boost.Regex how many memory blocks to store in it's internal
|
|
cache - memory blocks are taken from this cache rather than by
|
|
calling ::operator new. Generally speaking this can be an order
|
|
of magnitude faster than calling ::opertator new each time a memory
|
|
block is required, but has the downside that Boost.Regex can end
|
|
up caching a large chunk of memory (by default up to 16 blocks
|
|
each of BOOST_REGEX_BLOCKSIZE size). If memory is tight then try
|
|
defining this to 0 (disables all caching), or if that is too slow,
|
|
then a value of 1 or 2, may be sufficient. On the other hand, on
|
|
large multi-processor, multi-threaded systems, you may find that
|
|
a higher value is in order.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table></div>
|
|
</div>
|
|
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
|
<td align="left"></td>
|
|
<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<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>)
|
|
</p>
|
|
</div></td>
|
|
</tr></table>
|
|
<hr>
|
|
<div class="spirit-nav">
|
|
<a accesskey="p" href="locale.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../configuration.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="../install.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
|
|
</div>
|
|
</body>
|
|
</html>
|