| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>Algorithm Tuning</title> |
| <link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.74.0"> |
| <link rel="home" href="../../index.html" title="Boost.Regex"> |
| <link rel="up" href="../configuration.html" title="Configuration"> |
| <link rel="prev" href="algorithm.html" title="Algorithm 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="algorithm.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" lang="en"> |
| <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> |
| <p> |
| The following option applies only if BOOST_REGEX_RECURSIVE is set. |
| </p> |
| <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_HAS_MS_STACK_GUARD |
| </p> |
| </td> |
| <td> |
| <p> |
| Tells Boost.Regex that Microsoft style __try - __except blocks |
| are supported, and can be used to safely trap stack overflow. |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <p> |
| The following options apply only if BOOST_REGEX_NON_RECURSIVE is set. |
| </p> |
| <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> |
| In non-recursive mode, 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 tweek 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 speeking 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 -2010 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="algorithm.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> |
