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e25e1dc44b
the old mpmt_pthread directory to the new threaded directory. git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88199 13f79535-47bb-0310-9956-ffa450edef68
106 lines
4.0 KiB
HTML
106 lines
4.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<TITLE>Apache MPM threaded</TITLE>
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</HEAD>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<BODY
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#000080"
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ALINK="#FF0000"
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>
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<!--#include virtual="header.html" -->
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<H1 ALIGN="CENTER">Multi-Processing Module threaded</H1>
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<P>
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This Multi-Processing Module implements a hybrid multi-threaded
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multi-process web server.
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</P>
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<P><A
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HREF="module-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> MPM
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<BR>
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<A
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HREF="module-dict.html#SourceFile"
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REL="Help"
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><STRONG>Source File:</STRONG></A> threaded.c
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<BR>
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<A
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HREF="module-dict.html#ModuleIdentifier"
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REL="Help"
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><STRONG>Module Identifier:</STRONG></A> mpm_threaded_module
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</P>
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<H2>Summary</H2>
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<p>This Multi-Processing Module (MPM) is the default for most unix-like
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operating systems. It implements a hybrid
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multi-process multi-threaded server. Each process has a fixed number
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of threads. The server adjusts to handle load by increasing or
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decreasing the number of processes.</p>
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<p>A single control process is responsible for launching child
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processes. Each child process creates a fixed number of threads as
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specified in the <code>ThreadsPerChild</code> directive.
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The individual threads then listen for connections and
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serve them when they arrive.</p>
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<p>Apache always tries to maintain a pool of <em>spare</em> or idle
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server threads, which stand ready to serve incoming requests. In this
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way, clients do not need to wait for a new threads or processes to be
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created before their requests can be served. Apache assesses the
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total number of idle threads in all processes, and forks or kills
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processes to keep this number within the boundaries specified by
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<code>MinSpareThreads</code> and <code>MaxSpareThreads</code>.
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Since this process is very self-regulating, it is rarely necessary to
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modify these directives from their default values. The maximum
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number of clients that may be served simultaneously is determined
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by multiplying the maximum number of server processes that
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will be created (<code>MaxClients</code>) by the number of threads
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created in each process (<code>ThreadsPerChild</code>).</p>
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<p>While the parent process is usually started as root under Unix in
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order to bind to port 80, the child processes and threads are launched
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by Apache as a less-privileged user. The <code>User</code> and
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<code>Group</code> directives are used to set the privileges of the
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Apache child processes. The child processes must be able to read all
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the content that will be served, but should have as few privileges
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beyond that as possible. In addition, unless <a
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href="../suexec.html">suexec</a> is used, these directives also set
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the privileges which will be inherited by CGI scripts.</p>
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<p><code>MaxRequestsPerChild</code> controls how frequently the server
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recycles processes by killing old ones and launching new ones.</p>
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<p>See also: <a href="../bind.html">Setting which addresses and ports
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Apache uses</a>.</p>
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<H2>Directives</H2>
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<UL>
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<li><a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li>
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<li><a href="mpm_common.html#group">Group</a></li>
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<li><a href="mpm_common.html#pidfile">PidFile</a></li>
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<li><a href="mpm_common.html#listen">Listen</a></li>
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<li><a href="mpm_common.html#listenbacklog">ListenBacklog</a></li>
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<li><a href="mpm_common.html#lockfile">LockFile</a></li>
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<li><a href="mpm_common.html#maxclients">MaxClients</a></li>
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<li><a href="mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></li>
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<li><a href="mpm_common.html#maxsparethreads">MaxSpareThreads</a></li>
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<li><a href="mpm_common.html#minsparethreads">MinSpareThreads</a></li>
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<li><a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li>
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<li><a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li>
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<li><a href="mpm_common.html#startservers">StartServers</a></li>
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<li><a href="mpm_common.html#threadsperchild">ThreadsPerChild</a></li>
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<li><a href="mpm_common.html#user">User</a></li>
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</UL>
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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