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| author |   hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 03:10:21 -0500 |
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| committer | hongbotian <hongbo.tianhongbo@huawei.com> | 2015-11-30 03:10:21 -0500 |
| commit | c0b7206652b2852bc574694e7ba07ba1c2acdc00 (patch) | |
| tree | 5cb95cb0e19e03610525903df46279df2c3b7eb1 /rubbos/app/apache2/manual/mod/mod_file_cache.html.en | |
| parent | b6d3d6e668b793220f2d3af1bc3e828553dc3fe6 (diff) | |
delete app
Change-Id: Id4c572809969ebe89e946e88063eaed262cff3f2
Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>
Diffstat (limited to 'rubbos/app/apache2/manual/mod/mod_file_cache.html.en')
| -rw-r--r-- | rubbos/app/apache2/manual/mod/mod_file_cache.html.en | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/rubbos/app/apache2/manual/mod/mod_file_cache.html.en b/rubbos/app/apache2/manual/mod/mod_file_cache.html.en deleted file mode 100644 index 7dcc1d2b..00000000 --- a/rubbos/app/apache2/manual/mod/mod_file_cache.html.en +++ /dev/null @@ -1,212 +0,0 @@ -<?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>mod_file_cache - 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 Module mod_file_cache</h1> -<div class="toplang"> -<p><span>Available Languages: </span><a href="../en/mod/mod_file_cache.html" title="English"> en </a> | -<a href="../ko/mod/mod_file_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> -</div> -<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Caches a static list of files in memory</td></tr> -<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr> -<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>file_cache_module</td></tr> -<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_file_cache.c</td></tr></table> -<h3>Summary</h3> - - - <div class="warning"> - This module should be used with care. You can easily create a broken - site using <code class="module"><a href="../mod/mod_file_cache.html">mod_file_cache</a></code>, so read this document - carefully. - </div> - - <p><em>Caching</em> frequently requested files that change very - infrequently is a technique for reducing server load. - <code class="module"><a href="../mod/mod_file_cache.html">mod_file_cache</a></code> provides two techniques for caching - frequently requested <em>static</em> files. Through configuration - directives, you can direct <code class="module"><a href="../mod/mod_file_cache.html">mod_file_cache</a></code> to either - open then <code>mmap()</code> a file, or to pre-open a file and save - the file's open <em>file handle</em>. Both techniques reduce server - load when processing requests for these files by doing part of the work - (specifically, the file I/O) for serving the file when the - server is started rather than during each request.</p> - - <p>Notice: You cannot use this for speeding up CGI programs or - other files which are served by special content handlers. It - can only be used for regular files which are usually served by - the Apache core content handler.</p> - - <p>This module is an extension of and borrows heavily from the - <code>mod_mmap_static</code> module in Apache 1.3.</p> -</div> -<div id="quickview"><h3 class="directives">Directives</h3> -<ul id="toc"> -<li><img alt="" src="../images/down.gif" /> <a href="#cachefile">CacheFile</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#mmapfile">MMapFile</a></li> -</ul> -<h3>Topics</h3> -<ul id="topics"> -<li><img alt="" src="../images/down.gif" /> <a href="#using">Using mod_file_cache</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="using" id="using">Using mod_file_cache</a></h2> - - <p><code class="module"><a href="../mod/mod_file_cache.html">mod_file_cache</a></code> caches a list of statically - configured files via <code class="directive"><a href="#mmapfile">MMapFile</a></code> or <code class="directive"><a href="#cachefile">CacheFile</a></code> directives in the main server configuration.</p> - - <p>Not all platforms support both directives. For example, Apache - on Windows does not currently support the <code class="directive"><a href="#mmapstatic">MMapStatic</a></code> directive, while - other platforms, like AIX, support both. You will receive an error - message in the server error log if you attempt to use an - unsupported directive. If given an unsupported directive, the - server will start but the file will not be cached. On platforms - that support both directives, you should experiment with both to - see which works best for you.</p> - - <h3>MMapFile Directive</h3> - - <p>The <code class="directive"><a href="#mmapfile">MMapFile</a></code> - directive of <code class="module"><a href="../mod/mod_file_cache.html">mod_file_cache</a></code> maps a list of - statically configured files into memory through the system call - <code>mmap()</code>. This system call is available on most modern - Unix derivates, but not on all. There are sometimes system-specific - limits on the size and number of files that can be - <code>mmap()</code>ed, experimentation is probably the easiest way - to find out.</p> - - <p>This <code>mmap()</code>ing is done once at server start or - restart, only. So whenever one of the mapped files changes on the - filesystem you <em>have</em> to restart the server (see the <a href="../stopping.html">Stopping and Restarting</a> documentation). - To reiterate that point: if the files are modified <em>in place</em> - without restarting the server you may end up serving requests that - are completely bogus. You should update files by unlinking the old - copy and putting a new copy in place. Most tools such as - <code>rdist</code> and <code>mv</code> do this. The reason why this - modules doesn't take care of changes to the files is that this check - would need an extra <code>stat()</code> every time which is a waste - and against the intent of I/O reduction.</p> - - - <h3>CacheFile Directive</h3> - - <p>The <code class="directive"><a href="#cachefile">CacheFile</a></code> - directive of <code class="module"><a href="../mod/mod_file_cache.html">mod_file_cache</a></code> opens an active - <em>handle</em> or <em>file descriptor</em> to the file (or files) - listed in the configuration directive and places these open file - handles in the cache. When the file is requested, the server - retrieves the handle from the cache and passes it to the - <code>sendfile()</code> (or <code>TransmitFile()</code> on Windows), - socket API.</p> - - - - <p>This file handle caching is done once at server start or - restart, only. So whenever one of the cached files changes on - the filesystem you <em>have</em> to restart the server (see the - <a href="../stopping.html">Stopping and Restarting</a> - documentation). To reiterate that point: if the files are - modified <em>in place</em> without restarting the server you - may end up serving requests that are completely bogus. You - should update files by unlinking the old copy and putting a new - copy in place. Most tools such as <code>rdist</code> and - <code>mv</code> do this.</p> - - - <div class="note"><h3>Note</h3> - <p>Don't bother asking for a directive which recursively - caches all the files in a directory. Try this instead... See the - <code class="directive"><a href="../mod/core.html#include">Include</a></code> directive, and consider - this command:</p> - - <div class="example"><p><code> - find /www/htdocs -type f -print \<br /> - | sed -e 's/.*/mmapfile &/' > /www/conf/mmap.conf - </code></p></div> - </div> -</div> -<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> -<div class="directive-section"><h2><a name="CacheFile" id="CacheFile">CacheFile</a> <a name="cachefile" id="cachefile">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Cache a list of file handles at startup time</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheFile <var>file-path</var> [<var>file-path</var>] ...</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>Experimental</td></tr> -<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_file_cache</td></tr> -</table> - <p>The <code class="directive">CacheFile</code> directive opens handles to - one or more files (given as whitespace separated arguments) and - places these handles into the cache at server startup - time. Handles to cached files are automatically closed on a server - shutdown. When the files have changed on the filesystem, the - server should be restarted to to re-cache them.</p> - - <p>Be careful with the <var>file-path</var> arguments: They have - to literally match the filesystem path Apache's URL-to-filename - translation handlers create. We cannot compare inodes or other - stuff to match paths through symbolic links <em>etc.</em> - because that again would cost extra <code>stat()</code> system - calls which is not acceptable. This module may or may not work - with filenames rewritten by <code class="module"><a href="../mod/mod_alias.html">mod_alias</a></code> or - <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>.</p> - - <div class="example"><h3>Example</h3><p><code> - CacheFile /usr/local/apache/htdocs/index.html - </code></p></div> - -</div> -<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> -<div class="directive-section"><h2><a name="MMapFile" id="MMapFile">MMapFile</a> <a name="mmapfile" id="mmapfile">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Map a list of files into memory at startup time</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MMapFile <var>file-path</var> [<var>file-path</var>] ...</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>Experimental</td></tr> -<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_file_cache</td></tr> -</table> - <p>The <code class="directive">MMapFile</code> directive maps one or more files - (given as whitespace separated arguments) into memory at server - startup time. They are automatically unmapped on a server - shutdown. When the files have changed on the filesystem at - least a <code>HUP</code> or <code>USR1</code> signal should be send to - the server to re-<code>mmap()</code> them.</p> - - <p>Be careful with the <var>file-path</var> arguments: They have - to literally match the filesystem path Apache's URL-to-filename - translation handlers create. We cannot compare inodes or other - stuff to match paths through symbolic links <em>etc.</em> - because that again would cost extra <code>stat()</code> system - calls which is not acceptable. This module may or may not work - with filenames rewritten by <code class="module"><a href="../mod/mod_alias.html">mod_alias</a></code> or - <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>.</p> - - <div class="example"><h3>Example</h3><p><code> - MMapFile /usr/local/apache/htdocs/index.html - </code></p></div> - -</div> -</div> -<div class="bottomlang"> -<p><span>Available Languages: </span><a href="../en/mod/mod_file_cache.html" title="English"> en </a> | -<a href="../ko/mod/mod_file_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </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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