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   8 <title>leader - Apache HTTP Server</title>
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  16 <p class="apache">Apache HTTP Server Version 2.3</p>
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  20 <a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.3</a> &gt; <a href="./">Modules</a></div>
  21 <div id="page-content">
  22 <div id="preamble"><h1>Apache MPM leader</h1>
  23 <div class="toplang">
  24 <p><span>Available Languages: </span><a href="../de/mod/leader.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
  25 <a href="../en/mod/leader.html" title="English">&nbsp;en&nbsp;</a> |
  26 <a href="../ko/mod/leader.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
  27 </div>
  28 <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>
  29 MPM</td></tr>
  30 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr>
  31 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>mpm_leader_module</td></tr>
  32 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>leader.c</td></tr></table>
  33 <h3>Summary</h3>
  34
  35     <div class="warning"><h3>Warning</h3>
  36       <p>This MPM is experimental, so it may or may not work
  37       as expected.</p>
  38     </div>
  39
  40     <p>This is an experimental variant of the standard
  41     <code class="module"><a href="../mod/worker.html">worker</a></code> MPM. It uses a Leader/Followers design pattern
  42     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>
  43
  44     <p>To use the <code class="module"><a href="../mod/leader.html">leader</a></code> MPM, add
  45       <code>--with-mpm=leader</code> to the <code class="program"><a href="../programs/configure.html">configure</a></code>
  46       script's arguments when building the <code class="program"><a href="../programs/httpd.html">httpd</a></code>.</p>
  47
  48 </div>
  49 <div id="quickview"><h3 class="directives">Directives</h3>
  50 <ul id="toc">
  51 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#acceptmutex">AcceptMutex</a></li>
  52 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li>
  53 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#enableexceptionhook">EnableExceptionHook</a></li>
  54 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#group">Group</a></li>
  55 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listen">Listen</a></li>
  56 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listenbacklog">ListenBacklog</a></li>
  57 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#lockfile">LockFile</a></li>
  58 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxclients">MaxClients</a></li>
  59 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxmemfree">MaxMemFree</a></li>
  60 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></li>
  61 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxsparethreads">MaxSpareThreads</a></li>
  62 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#minsparethreads">MinSpareThreads</a></li>
  63 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#pidfile">PidFile</a></li>
  64 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#receivebuffersize">ReceiveBufferSize</a></li>
  65 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li>
  66 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li>
  67 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#serverlimit">ServerLimit</a></li>
  68 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#startservers">StartServers</a></li>
  69 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadlimit">ThreadLimit</a></li>
  70 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadsperchild">ThreadsPerChild</a></li>
  71 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadstacksize">ThreadStackSize</a></li>
  72 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#user">User</a></li>
  73 </ul>
  74 <h3>Topics</h3>
  75 <ul id="topics">
  76 <li><img alt="" src="../images/down.gif" /> <a href="#requirements">Requirements</a></li>
  77 </ul><h3>See also</h3>
  78 <ul class="seealso">
  79 <li><a href="worker.html">The worker MPM</a></li>
  80 </ul></div>
  81 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  82 <div class="section">
  83 <h2><a name="requirements" id="requirements">Requirements</a></h2>
  84     <p>This MPM depends on APR's atomic compare-and-swap operations for
  85     thread synchronization. If you are compiling for an x86 target
  86     and you don't need to support 386s, or you are compiling for a
  87     SPARC and you don't need to run on pre-UltraSPARC chips, add
  88     <code>--enable-nonportable-atomics=yes</code> to the
  89     <code class="program"><a href="../programs/configure.html">configure</a></code> script's arguments. This will cause
  90     APR to implement atomic operations
  91     using efficient opcodes not available in older CPUs.</p>
  92 </div>
  93 </div>
  94 <div class="bottomlang">
  95 <p><span>Available Languages: </span><a href="../de/mod/leader.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
  96 <a href="../en/mod/leader.html" title="English">&nbsp;en&nbsp;</a> |
  97 <a href="../ko/mod/leader.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
  98 </div><div id="footer">
  99 <p class="apache">Copyright 2009 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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