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| author |   hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 01:35:09 -0500 |
|---|---|---|
| committer | hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 01:36:35 -0500 |
| commit | cc40af334e619bb549038238507407866f774f8f (patch) | |
| tree | 43ddc1974f72997a57173151eafb23e6025a13c9 /rubbos/app/apache2/manual/mod/worker.html.en | |
| parent | 68e74fd78b2485e5914ce34a5b30f4485029e021 (diff) | |
upload apache
JIRA: BOTTLENECK-10
Change-Id: I67eae31de6dc824097dfa56ab454ba36fdd23a2c
Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>
Diffstat (limited to 'rubbos/app/apache2/manual/mod/worker.html.en')
| -rw-r--r-- | rubbos/app/apache2/manual/mod/worker.html.en | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/rubbos/app/apache2/manual/mod/worker.html.en b/rubbos/app/apache2/manual/mod/worker.html.en new file mode 100644 index 00000000..e38e1a03 --- /dev/null +++ b/rubbos/app/apache2/manual/mod/worker.html.en @@ -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="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.0</a> > <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"> de </a> | +<a href="../en/mod/worker.html" title="English"> en </a> | +<a href="../es/mod/worker.html" hreflang="es" rel="alternate" title="Español"> es </a> | +<a href="../ja/mod/worker.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../tr/mod/worker.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </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# 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 ">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# 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# maxrequestsperchild"> + MaxRequestsPerChild</a></code> to zero</li> + + <li>set the value of <code class="directive"><a href="../mod/mpm_common.html# 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"> de </a> | +<a href="../en/mod/worker.html" title="English"> en </a> | +<a href="../es/mod/worker.html" hreflang="es" rel="alternate" title="Español"> es </a> | +<a href="../ja/mod/worker.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../tr/mod/worker.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </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>
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