1<?xml version="1.0" encoding="ISO-8859-1"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- 4 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 5 This file is generated from xml source: DO NOT EDIT 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 --> 8<title>Multi-Processing Modules (MPMs) - Apache HTTP Server</title> 9<link href="/style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 10<link href="/style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 11<link href="/style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="/style/css/prettify.css" /> 12<script src="/style/scripts/prettify.js" type="text/javascript"> 13</script> 14 15<link href="/images/favicon.ico" rel="shortcut icon" /></head> 16<body id="manual-page"><div id="page-header"> 17<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p> 18<p class="apache">Apache HTTP Server Version 2.2</p> 19<img alt="" src="/images/feather.gif" /></div> 20<div class="up"><a href="./"><img title="<-" alt="<-" src="/images/left.gif" /></a></div> 21<div id="path"> 22<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.2</a></div><div id="page-content"><div id="preamble"><h1>Multi-Processing Modules (MPMs)</h1> 23<div class="toplang"> 24<p><span>Available Languages: </span><a href="/de/mpm.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | 25<a href="/en/mpm.html" title="English"> en </a> | 26<a href="/es/mpm.html" hreflang="es" rel="alternate" title="Espa�ol"> es </a> | 27<a href="/fr/mpm.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a> | 28<a href="/ja/mpm.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | 29<a href="/ko/mpm.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> | 30<a href="/tr/mpm.html" hreflang="tr" rel="alternate" title="T�rk�e"> tr </a> | 31<a href="/zh-cn/mpm.html" hreflang="zh-cn" rel="alternate" title="Simplified Chinese"> zh-cn </a></p> 32</div> 33 34<p>This document describes what a Multi-Processing Module is and 35how they are used by the Apache HTTP Server.</p> 36</div> 37<div id="quickview"><ul id="toc"><li><img alt="" src="/images/down.gif" /> <a href="#introduction">Introduction</a></li> 38<li><img alt="" src="/images/down.gif" /> <a href="#choosing">Choosing an MPM</a></li> 39<li><img alt="" src="/images/down.gif" /> <a href="#defaults">MPM Defaults</a></li> 40</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 41<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 42<div class="section"> 43<h2><a name="introduction" id="introduction">Introduction</a></h2> 44 45 <p>The Apache HTTP Server is designed to be a powerful and 46 flexible web server that can work on a very wide variety of 47 platforms in a range of different environments. Different 48 platforms and different environments often require different 49 features, or may have different ways of implementing the same 50 feature most efficiently. Apache has always accommodated a wide 51 variety of environments through its modular design. This design 52 allows the webmaster to choose which features will be included 53 in the server by selecting which modules to load either at 54 compile-time or at run-time.</p> 55 56 <p>Apache 2.0 extends this modular design to the most basic 57 functions of a web server. The server ships with a selection of 58 Multi-Processing Modules (MPMs) which are responsible for 59 binding to network ports on the machine, accepting requests, 60 and dispatching children to handle the requests.</p> 61 62 <p>Extending the modular design to this level of the server 63 allows two important benefits:</p> 64 65 <ul> 66 <li>Apache can more cleanly and efficiently support a wide 67 variety of operating systems. In particular, the Windows 68 version of Apache is now much more efficient, since 69 <code class="module"><a href="/mod/mpm_winnt.html">mpm_winnt</a></code> can use native 70 networking features in place of the POSIX layer used in 71 Apache 1.3. This benefit also extends to other operating 72 systems that implement specialized MPMs.</li> 73 74 <li>The server can be better customized for the needs of the 75 particular site. For example, sites that need a great deal of 76 scalability can choose to use a threaded MPM like 77 <code class="module"><a href="/mod/worker.html">worker</a></code> or <code class="module"><a href="/mod/event.html">event</a></code>, while sites requiring 78 stability or compatibility with older software can use a 79 <code class="module"><a href="/mod/prefork.html">prefork</a></code>.</li> 80 </ul> 81 82 <p>At the user level, MPMs appear much like other Apache 83 modules. The main difference is that one and only one MPM must 84 be loaded into the server at any time. The list of available 85 MPMs appears on the <a href="mod/">module index page</a>.</p> 86 87</div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 88<div class="section"> 89<h2><a name="choosing" id="choosing">Choosing an MPM</a></h2> 90 91 <p>MPMs must be chosen during configuration, and compiled into 92 the server. Compilers are capable of optimizing a lot of 93 functions if threads are used, but only if they know that 94 threads are being used.</p> 95 96 <p>To actually choose the desired MPM, use the argument 97 <code>--with-mpm=<em>NAME</em></code> with the 98 <code class="program"><a href="/programs/configure.html">configure</a></code> script. <em>NAME</em> is the name of the 99 desired MPM.</p> 100 101 <p>Once the server has been compiled, it is possible to 102 determine which MPM was chosen by using <code>/httpd 103 -l</code>. This command will list every module that is compiled 104 into the server, including the MPM.</p> 105</div><div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 106<div class="section"> 107<h2><a name="defaults" id="defaults">MPM Defaults</a></h2> 108 109<p>The following table lists the default MPMs for various operating 110systems. This will be the MPM selected if you do not make another 111choice at compile-time.</p> 112 113<table> 114 115<tr><td>BeOS</td><td><code class="module"><a href="/mod/beos.html">beos</a></code></td></tr> 116<tr><td>Netware</td><td><code class="module"><a href="/mod/mpm_netware.html">mpm_netware</a></code></td></tr> 117<tr><td>OS/2</td><td><code class="module"><a href="/mod/mpmt_os2.html">mpmt_os2</a></code></td></tr> 118<tr><td>Unix</td><td><code class="module"><a href="/mod/prefork.html">prefork</a></code></td></tr> 119<tr><td>Windows</td><td><code class="module"><a href="/mod/mpm_winnt.html">mpm_winnt</a></code></td></tr> 120</table> 121</div></div> 122<div class="bottomlang"> 123<p><span>Available Languages: </span><a href="/de/mpm.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | 124<a href="/en/mpm.html" title="English"> en </a> | 125<a href="/es/mpm.html" hreflang="es" rel="alternate" title="Espa�ol"> es </a> | 126<a href="/fr/mpm.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a> | 127<a href="/ja/mpm.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | 128<a href="/ko/mpm.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> | 129<a href="/tr/mpm.html" hreflang="tr" rel="alternate" title="T�rk�e"> tr </a> | 130<a href="/zh-cn/mpm.html" hreflang="zh-cn" rel="alternate" title="Simplified Chinese"> zh-cn </a></p> 131</div><div class="top"><a href="#page-header"><img src="/images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. 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