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| <title>leader - Apache HTTP Server</title> |
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| <p class="apache">Apache HTTP Server Version 2.0</p> |
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| <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> |
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| <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 class="retired"><h4>Please note</h4> |
| <p>This document refers to the <strong>2.0</strong> version of Apache httpd, which <strong>is no longer maintained</strong>. Upgrade, and refer to the current version of httpd instead, documented at:</p> |
| <ul><li><a href="http://httpd.apache.org/docs/current/">Current release version of Apache HTTP Server documentation</a></li></ul><p>You may follow <a href="http://httpd.apache.org/docs/current/mod/leader.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache MPM leader</h1> |
| <div class="toplang"> |
| <p><span>Available Languages: </span><a href="../de/mod/leader.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | |
| <a href="../en/mod/leader.html" title="English"> en </a> | |
| <a href="../es/mod/leader.html" hreflang="es" rel="alternate" title="Español"> es </a> | |
| <a href="../ko/mod/leader.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> |
| </div> |
| <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>An experimental variant of the standard <code class="module"><a href="../mod/worker.html">worker</a></code> |
| MPM</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 Identifier:</a></th><td>mpm_leader_module</td></tr> |
| <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>leader.c</td></tr></table> |
| <h3>Summary</h3> |
| |
| <div class="warning"><h3>Warning</h3> |
| <p>This MPM is experimental, so it may or may not work |
| as expected.</p> |
| </div> |
| |
| <p>This is an experimental variant of the standard |
| <code class="module"><a href="../mod/worker.html">worker</a></code> MPM. It uses a Leader/Followers design pattern |
| to coordinate work among threads. For more info, see <a href="http://deuce.doc.wustl.edu/doc/pspdfs/lf.pdf">http://deuce.doc.wustl.edu/doc/pspdfs/lf.pdf</a>.</p> |
| |
| <p>To use the <code class="module"><a href="../mod/leader.html">leader</a></code> MPM, add |
| <code>--with-mpm=leader</code> to the <code class="program"><a href="../programs/configure.html">configure</a></code> |
| script's arguments when building the <code class="program"><a href="../programs/httpd.html">httpd</a></code>.</p> |
| |
| <p>This MPM depends on APR's atomic compare-and-swap operations for |
| thread synchronization. If you are compiling for an x86 target |
| and you don't need to support 386s, or you are compiling for a |
| SPARC and you don't need to run on pre-UltraSPARC chips, add |
| <code>--enable-nonportable-atomics=yes</code> to the |
| <code class="program"><a href="../programs/configure.html">configure</a></code> script's arguments. This will cause |
| APR to implement atomic operations |
| using efficient opcodes not available in older CPUs.</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/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#maxclients">MaxClients</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxmemfree">MaxMemFree</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/right.gif" /> <a href="mpm_common.html#minsparethreads">MinSpareThreads</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#startservers">StartServers</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#threadsperchild">ThreadsPerChild</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#user">User</a></li> |
| </ul> |
| </div> |
| |
| </div> |
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| <a href="../en/mod/leader.html" title="English"> en </a> | |
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| <a href="../ko/mod/leader.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> |
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| <p class="apache">Copyright 2013 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p> |
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