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<title>threadpool - Apache HTTP Server</title>
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<div id="preamble"><h1>Apache MPM threadpool</h1>
<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Yet another 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_threadpool_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>threadpool.c</td></tr></table>
<h3>Summary</h3>

    <div class="warning"><h3>Warning</h3>
      <p>This MPM is a developer playground and highly experimental, so it
      may or may not work as expected.</p>
    </div>

    <p>This is an experimental variant of the standard worker MPM.
    Rather than queuing connections like the worker MPM, the
    <code class="module"><a href="../mod/threadpool.html">threadpool</a></code> MPM queues idle worker threads and
    hands each accepted connection to the next available worker.</p>

    <p>The <code class="module"><a href="../mod/threadpool.html">threadpool</a></code> MPM can't match the performance of
    the <code class="module"><a href="../mod/worker.html">worker</a></code> MPM in benchmark testing. As of 2.0.39,
    some of the key load-throtting concepts from the <code class="module"><a href="../mod/threadpool.html">threadpool</a></code> MPM have been incorporated into the <code class="module"><a href="../mod/worker.html">worker</a></code> MPM. The <code class="module"><a href="../mod/threadpool.html">threadpool</a></code> code is useful
    primarily as a research platform. For general-purpose use and for any
    production environments, use <code class="module"><a href="../mod/worker.html">worker</a></code> instead.</p>
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<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#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#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>
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