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authorhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 01:45:08 -0500
committerhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 01:45:08 -0500
commite8ec7aa8e38a93f5b034ac74cebce5de23710317 (patch)
treeaa031937bf856c1f8d6ad7877b8d2cb0224da5ef /rubbos/app/httpd-2.0.64/docs/manual/mod/worker.html.en
parentcc40af334e619bb549038238507407866f774f8f (diff)
upload http
JIRA: BOTTLENECK-10 Change-Id: I7598427ff904df438ce77c2819ee48ac75ffa8da Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>
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@@ -0,0 +1,180 @@
+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ This file is generated from xml source: DO NOT EDIT
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ -->
+<title>worker - Apache HTTP Server</title>
+<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
+<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
+<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
+<link href="../images/favicon.ico" rel="shortcut icon" /></head>
+<body>
+<div id="page-header">
+<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
+<p class="apache">Apache HTTP Server Version 2.0</p>
+<img alt="" src="../images/feather.gif" /></div>
+<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
+<div id="path">
+<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 2.0</a> &gt; <a href="./">Modules</a></div>
+<div id="page-content">
+<div id="preamble"><h1>Apache MPM worker</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../de/mod/worker.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
+<a href="../en/mod/worker.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../es/mod/worker.html" hreflang="es" rel="alternate" title="Español">&nbsp;es&nbsp;</a> |
+<a href="../ja/mod/worker.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="../tr/mod/worker.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div>
+<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Multi-Processing Module implementing a hybrid
+ multi-threaded multi-process web server</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_worker_module</td></tr>
+<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>worker.c</td></tr></table>
+<h3>Summary</h3>
+
+ <p>This Multi-Processing Module (MPM) implements a hybrid
+ multi-process multi-threaded server. By using threads to serve
+ requests, it is able to serve a large number of requests with
+ less system resources than a process-based server. Yet it
+ retains much of the stability of a process-based server by
+ keeping multiple processes available, each with many threads.</p>
+
+ <p>The most important directives used to control this MPM are
+ <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code>, which
+ controls the number of threads deployed by each child process and
+ <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code>, which
+ controls the maximum total number of threads that may be
+ launched.</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>
+<h3>Topics</h3>
+<ul id="topics">
+<li><img alt="" src="../images/down.gif" /> <a href="#how-it-works">How it Works</a></li>
+</ul><h3>See also</h3>
+<ul class="seealso">
+<li><a href="../bind.html">Setting which addresses and ports Apache
+uses</a></li>
+</ul></div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="how-it-works" id="how-it-works">How it Works</a></h2>
+ <p>A single control process (the parent) is responsible for launching
+ child processes. Each child process creates a fixed number of server
+ threads as specified in the <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> directive, as well
+ as a listener thread which listens for connections and passes them
+ to a server thread for processing when they arrive.</p>
+
+ <p>Apache always tries to maintain a pool of <dfn>spare</dfn> 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. The number of processes that will initially launched is
+ set by the <code class="directive"><a href="../mod/mpm_common.html#startservers">StartServers</a></code>
+ directive. Then during operation, 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 class="directive"><a href="../mod/mpm_common.html#minsparethreads">MinSpareThreads</a></code> and <code class="directive"><a href="../mod/mpm_common.html#maxsparethreads">MaxSpareThreads</a></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 (i.e., the maximum total
+ number of threads in all processes) is determined by the
+ <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code> directive.
+ The maximum number of active child processes is determined by
+ the <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code>
+ directive divided by the <code class="directive"><a href="../mod/mpm_common.html#&#10; threadsperchild">
+ ThreadsPerChild</a></code> directive.</p>
+
+ <p>Two directives set hard limits on the number of active child
+ processes and the number of server threads in a child process,
+ and can only be changed by fully stopping the server and then
+ starting it again. <code class="directive"><a href="../mod/mpm_common.html#serverlimit&#10; ">ServerLimit
+ </a></code> is a hard limit on the number of active child
+ processes, and must be greater than or equal to the
+ <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code>
+ directive divided by the <code class="directive"><a href="../mod/mpm_common.html#&#10; threadsperchild">
+ ThreadsPerChild</a></code> directive.
+ <code class="directive"><a href="../mod/mpm_common.html#threadlimit">ThreadLimit</a></code> is a hard
+ limit of the number of server threads, and must be greater than
+ or equal to the <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> directive. If
+ non-default values are specified for these directives, they
+ should appear before other <code class="module"><a href="../mod/worker.html">worker</a></code> directives.</p>
+
+ <p>In addition to the set of active child processes, there may
+ be additional child processes which are terminating but where at
+ least one server thread is still handling an existing client
+ connection. Up to <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code> terminating processes
+ may be present, though the actual number can be expected to be
+ much smaller. This behavior can be avoided by disabling the
+ termination of individual child processes, which is achieved by
+ the following:</p>
+
+ <ul>
+ <li>set the value of <code class="directive"><a href="../mod/mpm_common.html#&#10; maxrequestsperchild">
+ MaxRequestsPerChild</a></code> to zero</li>
+
+ <li>set the value of <code class="directive"><a href="../mod/mpm_common.html#&#10; maxsparethreads">
+ MaxSpareThreads</a></code> to the same value as
+ <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code></li>
+ </ul>
+
+ <p>A typical configuration of the process-thread controls in
+ the <code class="module"><a href="../mod/worker.html">worker</a></code> MPM could look as follows:</p>
+
+ <div class="example"><p><code>
+ ServerLimit 16<br />
+ StartServers 2<br />
+ MaxClients 150<br />
+ MinSpareThreads 25<br />
+ MaxSpareThreads 75<br />
+ ThreadsPerChild 25
+ </code></p></div>
+
+ <p>While the parent process is usually started as <code>root</code>
+ 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 class="directive"><a href="../mod/mpm_common.html#user">User</a></code> and <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></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 <code class="program"><a href="../programs/suexec.html">suexec</a></code> is used,
+ these directives also set the privileges which will be inherited
+ by CGI scripts.</p>
+
+ <p><code class="directive"><a href="../mod/mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></code>
+ controls how frequently the server recycles processes by killing
+ old ones and launching new ones.</p>
+</div>
+</div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../de/mod/worker.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
+<a href="../en/mod/worker.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../es/mod/worker.html" hreflang="es" rel="alternate" title="Español">&nbsp;es&nbsp;</a> |
+<a href="../ja/mod/worker.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="../tr/mod/worker.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div><div id="footer">
+<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>
+<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div>
+</body></html> \ No newline at end of file