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121 lines
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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This file is generated from xml source: DO NOT EDIT
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--><title>mod_mem_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-project/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">Modules</a></div><div id="page-content"><div id="preamble"><h1>Apache Module mod_mem_cache</h1><table class="module"><tr><th><a href="module-dict.html#Description">Description:
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</a></th><td>Content cache keyed to URIs</td></tr><tr><th><a href="module-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:
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</a></th><td>mem_cache_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source File:
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</a></th><td>mod_mem_cache.c</td></tr></table><h3>Summary</h3>
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<div class="warning">
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This module is experimental. Documentation is still under development...
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</div>
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<p>mod_mem_cache implements an in-memory based storage manager.
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mod_mem_cache can be configured to operate in two modes: caching open file
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descriptors or caching objects in heap storage. <em>mod_mem_cache</em>
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is most useful when used to cache locally generated content or to cache
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backend server content for <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> configured for ProxyPass
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(aka <em>reverse proxy</em>)</p>
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<div class="note">
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<p><code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> requires the services of <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>.</p>
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</div>
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<p>Content stored and retrived keyed to the URL. Content with
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access protections is not cached.</p>
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</div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#mcachemaxobjectcount">MCacheMaxObjectCount</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#mcachemaxobjectsize">MCacheMaxObjectSize</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#mcacheminobjectsize">MCacheMinObjectSize</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#mcacheremovalalgorithm">MCacheRemovalAlgorithm</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#mcachesize">MCacheSize</a></li>
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</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="MCacheMaxObjectCount" id="MCacheMaxObjectCount">MCacheMaxObjectCount</a> <a name="mcachemaxobjectcount" id="mcachemaxobjectcount">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>The maximum number of objects allowed to be placed in the cache</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>MCacheMaxObjectCount <em>value</em></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>MCacheMaxObjectCount 1009</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_mem_cache</td></tr></table>
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<p>The <code class="directive">MCacheMaxObjectCount</code> directive sets the maximum
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number of objects to be cached. If a new entry needs to be
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inserted in the cache and the maximum number of objects is reached, an entry
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will be removed to allow the new entry be cached. </p>
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<div class="note">
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The value of <code class="directive">MCacheMaxObjectCount</code> is used to create
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the open hash table.
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</div>
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<div class="example"><p><code>
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MCacheMaxObjectCount 13001 <br />
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="MCacheMaxObjectSize" id="MCacheMaxObjectSize">MCacheMaxObjectSize</a> <a name="mcachemaxobjectsize" id="mcachemaxobjectsize">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>The maximum size (in bytes) of an object to be placed in the cache</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>MCacheMaxObjectSize <em>bytes</em></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>MCacheMaxObjectSize 10000</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_mem_cache</td></tr></table>
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<p>The <code class="directive">MCacheMaxObjectSize</code> directive sets the maximum
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size of an object to be cached.</p>
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<div class="warning">
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The size must be greater than <code class="directive">MCacheMinObjectSize</code>.
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</div>
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<div class="example"><p><code>
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MCacheMaxObjectSize 6400000 <br />
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="MCacheMinObjectSize" id="MCacheMinObjectSize">MCacheMinObjectSize</a> <a name="mcacheminobjectsize" id="mcacheminobjectsize">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>The minimum size (in bytes) of an object to be placed in the cache</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>MCacheMinObjectSize <em>bytes</em></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>MCacheMinObjectSize 0</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_mem_cache</td></tr></table>
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<p>The <code class="directive">MCacheMinObjectSize</code> directive sets the minimum
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size in bytes of an object to be cached.</p>
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<div class="example"><p><code>
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MCacheMinObjectSize 10000 <br />
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="MCacheRemovalAlgorithm" id="MCacheRemovalAlgorithm">MCacheRemovalAlgorithm</a> <a name="mcacheremovalalgorithm" id="mcacheremovalalgorithm">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>The algorithm used to remove entries from the cache</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>MCacheRemovalAlgorithm <em>algorithm</em></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>MCacheRemovalAlgorithm GDSF</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_mem_cache</td></tr></table>
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<p>The <code class="directive">MCacheRemovalAlgorithm</code> directive sets the algorithm
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used to remove entries from the cache.
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Two choices are available: <br />
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LRU (Least Recently Used): LRU removes the objects that have not been
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accessed for the longest time.<br />
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GDSF (GreadyDual-Size): This algorithm assigns priority to cached objects
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based on the coast of a cache miss and the size of the object. Objects with
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smallest priority are removed first.</p>
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<div class="example"><p><code>
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MCacheRemovalAlgorithm GDSF <br />
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MCacheRemovalAlgorithm LRU <br />
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="MCacheSize" id="MCacheSize">MCacheSize</a> <a name="mcachesize" id="mcachesize">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>The maximum amount of memory used by the cache in KBytes</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td><code>MCacheSize <em>KBytes</em></code></td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>MCacheSize 100</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Experimental</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_mem_cache</td></tr></table>
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<p>The <code class="directive">MCacheSize</code> directive sets the desired space
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usage of the cache, in KBytes (1024-byte units). If a new entry needs to be
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inserted in the cache and the size of the entry is greather than the
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remaining size, entries will be removed until the new entry could be cached.
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The removed entry is decided base on the <code class="directive">MCacheRemovalAlgorithm</code> algorithm</p>
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<div class="warning">
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The size must be greater than <code class="directive">MCacheMaxObjectSize</code>.
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</div>
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<div class="example"><p><code>
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MCacheSize 700000 <br />
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</code></p></div>
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</div></div><div id="footer"><p class="apache">Maintained by the <a href="http://httpd.apache.org/docs-project/">Apache HTTP Server Documentation Project</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> |