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+ <title>Apache MPM worker</title>
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+ <h1 align="CENTER">Multi-Processing Module worker</h1>
+
+ <p>This Multi-Processing Module implements a hybrid
+ multi-threaded multi-process web server.</p>
+
+ <p><a href="module-dict.html#Status"
+ rel="Help"><strong>Status:</strong></a> MPM<br />
+ <a href="module-dict.html#SourceFile"
+ rel="Help"><strong>Source File:</strong></a> worker.c<br />
+ <a href="module-dict.html#ModuleIdentifier"
+ rel="Help"><strong>Module Identifier:</strong></a>
+ mpm_worker_module</p>
+
+ <h2>Summary</h2>
+
+ <p>This Multi-Processing Module (MPM) is the default for most
+ unix-like operating systems. It implements a hybrid
+ multi-process multi-threaded server. Each process has a fixed
+ number of threads. The server adjusts to handle load by
+ increasing or decreasing the number of processes.</p>
+
+ <p>A single control process is responsible for launching child
+ processes. Each child process creates a fixed number of threads
+ as specified in the <code>ThreadsPerChild</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 <em>spare</em> or
+ idle server threads, which stand ready to serve incoming
+ requests. In this way, clients do not need to wait for a new
+ threads or processes to be created before their requests can be
+ served. Apache assesses the total number of idle threads in all
+ processes, and forks or kills processes to keep this number
+ within the boundaries specified by <code>MinSpareThreads</code>
+ and <code>MaxSpareThreads</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 maximum number of server processes that will be
+ created (<code>MaxClients</code>) by the number of threads
+ created in each process (<code>ThreadsPerChild</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>User</code> and <code>Group</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 <a
+ href="../suexec.html">suexec</a> is used, these directives also
+ set the privileges which will be inherited by CGI scripts.</p>
+
+ <p><code>MaxRequestsPerChild</code> controls how frequently the
+ server recycles processes by killing old ones and launching new
+ ones.</p>
+
+ <p>See also: <a href="../bind.html">Setting which addresses and
+ ports Apache uses</a>.</p>
+
+ <h2>Directives</h2>
+
+ <ul>
+ <li><a
+ href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li>
+
+ <li><a href="mpm_common.html#group">Group</a></li>
+
+ <li><a href="mpm_common.html#pidfile">PidFile</a></li>
+
+ <li><a href="mpm_common.html#listen">Listen</a></li>
+
+ <li><a
+ href="mpm_common.html#listenbacklog">ListenBacklog</a></li>
+
+ <li><a href="mpm_common.html#lockfile">LockFile</a></li>
+
+ <li><a href="mpm_common.html#maxclients">MaxClients</a></li>
+
+ <li><a
+ href="mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></li>
+
+ <li><a
+ href="mpm_common.html#maxsparethreads">MaxSpareThreads</a></li>
+
+ <li><a
+ href="mpm_common.html#minsparethreads">MinSpareThreads</a></li>
+
+ <li><a
+ href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li>
+
+ <li><a
+ href="mpm_common.html#sendbuffersize">SendBufferSize</a></li>
+
+ <li><a
+ href="mpm_common.html#startservers">StartServers</a></li>
+
+ <li><a
+ href="mpm_common.html#threadsperchild">ThreadsPerChild</a></li>
+
+ <li><a href="mpm_common.html#user">User</a></li>
+ </ul>
+ <!--#include virtual="footer.html" -->
+ </body>
+</html>
+
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