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<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX This file is generated from xml source: DO NOT EDIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --><title>perchild - Apache HTTP Server</title><link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /><link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /><link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link href="../images/favicon.ico" rel="shortcut icon" /></head><body><div id="page-header"><p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p><p class="apache">Apache HTTP Server Version 2.0</p><img alt="" src="../images/feather.gif" /></div><div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div><div id="path"><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 2.0</a> > <a href="./">Modules</a></div><div id="page-content"><div id="preamble"><h1>Apache MPM perchild</h1><div class="toplang"><p><span>Available Languages: </span><a href="../en/mod/perchild.html" title="English"> en </a></p></div><table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Multi-Processing Module allowing for daemon processes servingrequests to be assigned a variety of different userids</td></tr><tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr><tr><th><a href="module-dict.html#ModuleIdentifier">Module營dentifier:</a></th><td>mpm_perchild_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source燜ile:</a></th><td>perchild.c</td></tr></table><h3>Summary</h3> <div class="warning"> This module is not functional. Development of this module is not complete and is not currently active. Do not use <code class="module"><a href="../mod/perchild.html">perchild</a></code> unless you are a programmer willing to help fix it. </div> <p>This Multi-Processing Module (MPM) implements a hybrid multi-process, multi-threaded web server. A fixed number of processes create threads to handle requests. Fluctuations in load are handled by increasing or decreasing the number of threads in each process.</p></div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#acceptmutex">AcceptMutex</a></li><li><img alt="" src="../images/down.gif" /> <a href="#assignuserid">AssignUserID</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#bs2000account">BS2000Account</a></li><li><img alt="" src="../images/down.gif" /> <a href="#childperuserid">ChildPerUserID</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#enableexceptionhook">EnableExceptionHook</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#group">Group</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listen">Listen</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listenbacklog">ListenBacklog</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#lockfile">LockFile</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxsparethreads">MaxSpareThreads</a></li><li><img alt="" src="../images/down.gif" /> <a href="#maxthreadsperchild">MaxThreadsPerChild</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#minsparethreads">MinSpareThreads</a></li><li><img alt="" src="../images/down.gif" /> <a href="#numservers">NumServers</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#pidfile">PidFile</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#receivebuffersize">ReceiveBufferSize</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#serverlimit">ServerLimit</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#startthreads">StartThreads</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadlimit">ThreadLimit</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#user">User</a></li></ul><h3>Topics</h3><ul id="topics"><li><img alt="" src="../images/down.gif" /> <a href="#how-it-works">How it works</a></li></ul><h3>See also</h3><ul class="seealso"><li><a href="../bind.html">Setting which addresses and ports Apacheuses</a></li></ul></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="how-it-works" id="how-it-works">How it works</a></h2> <p>A single control process launches the number of child processes indicated by the <code class="directive"><a href="#numservers">NumServers</a></code> directive at server startup. Each child process creates threads as specified in the <code class="directive"><a href="../mod/mpm_common.html#startthreads">StartThreads</a></code> directive. The individual threads then listen for connections and serve them when they arrive.</p> <p>Apache always tries to maintain a pool of <dfn>spare</dfn> or idle server threads, which stand ready to serve incoming requests. In this way, clients do not need to wait for new threads to be created. For each child process, Apache assesses the number of idle threads and creates or destroys threads to keep this number within the boundaries specified by <code class="directive"><a href="../mod/mpm_common.html#minsparethreads">MinSpareThreads</a></code> and <code class="directive"><a href="../mod/mpm_common.html#maxsparethreads">MaxSpareThreads</a></code>. Since this process is very self-regulating, it is rarely necessary to modify these directives from their default values. The maximum number of clients that may be served simultaneously is determined by multiplying the number of server processes that will be created (<code class="directive"><a href="#numservers">NumServers</a></code>) by the maximum number of threads created in each process (<code class="directive"><a href="../mod/mpm_common.html#maxthreadsperchild">MaxThreadsPerChild</a></code>).</p> <p>While the parent process is usually started as root under Unix in order to bind to port 80, the child processes and threads are launched by Apache as a less-privileged user. The <code class="directive"><a href="../mod/mpm_common.html#user">User</a></code> and <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code> directives are used to set the privileges of the Apache child processes. The child processes must be able to read all the content that will be served, but should have as few privileges beyond that as possible. In addition, unless <code class="program"><a href="../programs/suexec.html">suexec</a></code> is used, these directives also set the privileges which will be inherited by CGI scripts.</p> <p><code class="directive"><a href="../mod/mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></code> controls how frequently the server recycles processes by killing old ones and launching new ones.</p> <h3><a name="user-ids" id="user-ids">Working with different user-IDs</a></h3> <p>The <code class="module"><a href="../mod/perchild.html">perchild</a></code> MPM adds the extra ability to specify that particular processes should serve requests under different user-IDs. These user-IDs can then be associated with specific virtual hosts. You have to use one <code class="directive"><a href="#childperuserid">ChildPerUserID</a></code> directive for every user/group combination you want to be run. Then you can tie particular virtual hosts to that user and group IDs.</p> <p>The following example runs 7 child processes. Two of them are run under <code>user1</code>/<code>group1</code>. The next four are run under <code>user2</code>/<code>group2</code> and the remaining process uses the <code class="directive"><a href="../mod/mpm_common.html#user">User</a></code> and <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code>⌨️ 快捷键说明
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