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96 lines
3.9 KiB
Plaintext
96 lines
3.9 KiB
Plaintext
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org" />
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<title>Apache Multi-Processing Modules (MPMs)</title>
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</head>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
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vlink="#000080" alink="#FF0000">
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<!--#include virtual="header.html" -->
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<h1 align="center">Apache Multi-Processing Modules</h1>
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<p>The Apache HTTP Server is designed to be a powerful and
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flexible web server that can work on a very wide variety of
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platforms in a range of different environments. Different
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platforms and different environments often require different
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features, or may have different ways of implementing the same
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feature most efficiently. Apache has always accommodated a wide
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variety of environments through its modular design. This design
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allows the webmaster to choose which features will be included
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in the server by selecting which modules to load either at
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compile-time or at run-time.</p>
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<p>Apache 2.0 extends this modular design to the most basic
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functions of a web server. The server ships with a selection of
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Multi-Processing Modules (MPMs) which are responsible for
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binding to network ports on the machine, accepting requests,
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and dispatching children to handle the requests.</p>
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<p>Extending the modular design to this level of the server
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allows two important benefits:</p>
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<ul>
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<li>Apache can more cleanly and efficiently support a wide
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variety of operating systems. In particular, the Windows
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version of Apache is now much more efficient, since <a
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href="mod/mpm_winnt.html">mpm_winnt</a> can use native
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networking features in place of the POSIX layer used in
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Apache 1.3. This benefit also extends to other operating
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systems that implement specialized MPMs.</li>
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<li>The server can be better customized for the needs of the
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particular site. For example, sites that need a great deal of
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scalability can choose to use a threaded MPM like <a
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href="mod/worker.html">worker</a>, while sites requiring
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stability or compatibility with older software can use a <a
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href="mod/prefork.html">preforking MPM</a>. In addition,
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special features like serving different hosts under different
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userids (<a href="mod/perchild.html">perchild</a>) can be
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provided.</li>
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</ul>
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<p>At the user level, MPMs appear much like other Apache
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modules. The main difference is that one and only one MPM must
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be loaded into the server at any time. The list of available
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MPMs appears on the <a href="mod/">module index page</a>.</p>
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<h2 align="center">Choosing an MPM</h2>
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<p>MPMs must be chosen during configuration, and compiled into
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the server. Compilers are capable of optimizing a lot of
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functions if threads are used, but only if they know that
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threads are being used. Because some MPMs use threads on Unix
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and others don't, Apache will always perform better if the MPM
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is chosen at configuration time and built into Apache.</p>
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<p>To actually choose the desired MPM, use the argument
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--with-mpm= <em>NAME</em> with the ./configure script.
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<em>NAME</em> is the name of the desired MPM.</p>
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<p>Once the server has been compiled, it is possible to
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determine which MPM was chosen by using <code>./httpd
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-l</code>. This command will list every module that is compiled
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into the server, including the MPM.</p>
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<h2 align="center">MPM Defaults</h2>
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<ul>
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<li>BeOS: beos</li>
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<li>OS/2: mpmt_os2</li>
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<li>Unix: prefork</li>
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<li>Windows: winnt</li>
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</ul>
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<!--#include virtual="footer.html" -->
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</body>
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</html>
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