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| author |   hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 01:45:08 -0500 |
|---|---|---|
| committer | hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 01:45:08 -0500 |
| commit | e8ec7aa8e38a93f5b034ac74cebce5de23710317 (patch) | |
| tree | aa031937bf856c1f8d6ad7877b8d2cb0224da5ef /rubbos/app/httpd-2.0.64/docs/manual/mod/prefork.html.en | |
| parent | cc40af334e619bb549038238507407866f774f8f (diff) | |
upload http
JIRA: BOTTLENECK-10
Change-Id: I7598427ff904df438ce77c2819ee48ac75ffa8da
Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>
Diffstat (limited to 'rubbos/app/httpd-2.0.64/docs/manual/mod/prefork.html.en')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/docs/manual/mod/prefork.html.en | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/rubbos/app/httpd-2.0.64/docs/manual/mod/prefork.html.en b/rubbos/app/httpd-2.0.64/docs/manual/mod/prefork.html.en new file mode 100644 index 00000000..127eb9e5 --- /dev/null +++ b/rubbos/app/httpd-2.0.64/docs/manual/mod/prefork.html.en @@ -0,0 +1,181 @@ +<?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>prefork - 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 prefork</h1> +<div class="toplang"> +<p><span>Available Languages: </span><a href="../de/mod/prefork.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | +<a href="../en/mod/prefork.html" title="English"> en </a> | +<a href="../es/mod/prefork.html" hreflang="es" rel="alternate" title="Español"> es </a> | +<a href="../ja/mod/prefork.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../tr/mod/prefork.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>Implements a non-threaded, pre-forking 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_prefork_module</td></tr> +<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>prefork.c</td></tr></table> +<h3>Summary</h3> + + <p>This Multi-Processing Module (MPM) implements a non-threaded, + pre-forking web server that handles requests in a manner similar + to Apache 1.3. It is appropriate for sites that need to avoid + threading for compatibility with non-thread-safe libraries. It + is also the best MPM for isolating each request, so that a problem + with a single request will not affect any other.</p> + + <p>This MPM is very self-regulating, so it is rarely necessary to + adjust its configuration directives. Most important is that + <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code> be big enough to + handle as many simultaneous requests as you expect to receive, but + small enough to assure that there is enough physical RAM for all + processes.</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#bs2000account">BS2000Account</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/down.gif" /> <a href="#maxspareservers">MaxSpareServers</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#minspareservers">MinSpareServers</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#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 is responsible for launching child + processes which listen for connections and serve them when they + arrive. Apache always tries to maintain several <dfn>spare</dfn> + or idle server processes, which stand ready to serve incoming + requests. In this way, clients do not need to wait for a new + child processes to be forked before their requests can be + served.</p> + + <p>The <code class="directive"><a href="../mod/mpm_common.html#startservers">StartServers</a></code>, + <code class="directive"><a href="#minspareservers">MinSpareServers</a></code>, + <code class="directive"><a href="#maxspareservers">MaxSpareServers</a></code>, and + <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code> regulate how + the parent process creates children to serve requests. In general, + Apache is very self-regulating, so most sites do not need to + adjust these directives from their default values. Sites which + need to serve more than 256 simultaneous requests may need to + increase <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code>, + while sites with limited memory may need to decrease <code class="directive"><a href="../mod/mpm_common.html#maxclients">MaxClients</a></code> to keep the server from + thrashing (swapping memory to disk and back). More information + about tuning process creation is provided in the <a href="../misc/perf-tuning.html">performance hints</a> + documentation.</p> + + <p>While the parent process is usually started as <code>root</code> + under Unix in order to bind to port 80, the child processes 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.</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 class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="MaxSpareServers" id="MaxSpareServers">MaxSpareServers</a> <a name="maxspareservers" id="maxspareservers">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of idle child server processes</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MaxSpareServers <var>number</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>MaxSpareServers 10</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr> +<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>prefork</td></tr> +</table> + <p>The <code class="directive">MaxSpareServers</code> directive sets the + desired maximum number of <em>idle</em> child server processes. An + idle process is one which is not handling a request. If there are + more than <code class="directive">MaxSpareServers</code> idle, then the + parent process will kill off the excess processes.</p> + + <p>Tuning of this parameter should only be necessary on very + busy sites. Setting this parameter to a large number is almost + always a bad idea. If you are trying to set the value lower than + <code class="directive"><a href="#minspareservers">MinSpareServers</a></code>, Apache + will automatically adjust it to <code class="directive">MinSpareServers</code><code> + 1</code>.</p> + +<h3>See also</h3> +<ul> +<li><code class="directive"><a href="#minspareservers">MinSpareServers</a></code></li> +<li><code class="directive"><a href="../mod/mpm_common.html#startservers">StartServers</a></code></li> +</ul> +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="MinSpareServers" id="MinSpareServers">MinSpareServers</a> <a name="minspareservers" id="minspareservers">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Minimum number of idle child server processes</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MinSpareServers <var>number</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>MinSpareServers 5</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr> +<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>prefork</td></tr> +</table> + <p>The <code class="directive">MinSpareServers</code> directive sets the + desired minimum number of <em>idle</em> child server processes. An + idle process is one which is not handling a request. If there are + fewer than <code class="directive">MinSpareServers</code> idle, then the parent + process creates new children at a maximum rate of 1 per second.</p> + + <p>Tuning of this parameter should only be necessary on very + busy sites. Setting this parameter to a large number is almost + always a bad idea.</p> + +<h3>See also</h3> +<ul> +<li><code class="directive"><a href="#maxspareservers">MaxSpareServers</a></code></li> +<li><code class="directive"><a href="../mod/mpm_common.html#startservers">StartServers</a></code></li> +</ul> +</div> +</div> +<div class="bottomlang"> +<p><span>Available Languages: </span><a href="../de/mod/prefork.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | +<a href="../en/mod/prefork.html" title="English"> en </a> | +<a href="../es/mod/prefork.html" hreflang="es" rel="alternate" title="Español"> es </a> | +<a href="../ja/mod/prefork.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../tr/mod/prefork.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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