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113 lines
11 KiB
Plaintext
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--><title>mod_mem_cache - Apache HTTP Server</title><link href="../style/manual.css" type="text/css" rel="stylesheet"></head><body><blockquote><div align="center"><img src="../images/sub.gif" alt="[APACHE DOCUMENTATION]"><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Apache Module mod_mem_cache</h1><table cellspacing="1" cellpadding="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap" valign="top"><span class="help">Description:
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</span></td><td>Content cache keyed to URIs</td></tr><tr><td nowrap="nowrap"><a href="module-dict.html#Status" class="help">Status:
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</a></td><td>Experimental</td></tr><tr><td nowrap="nowrap"><a href="module-dict.html#ModuleIdentifier" class="help">Module Identifier:
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</a></td><td>mem_cache_module</td></tr></table></td></tr></table><h2>Summary</h2>
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<blockquote><table><tr><td bgcolor="#ffe5f5">
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This module is experimental. Documentation is still under development...
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</td></tr></table></blockquote>
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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><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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<blockquote><table><tr><td bgcolor="#e0e5f5">
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<p><code><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> requires the services of <code><a href="../mod/mod_cache.html">mod_cache</a></code>.</p>
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</td></tr></table></blockquote>
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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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<h2>Directives</h2><ul><li><a href="#mcachemaxobjectcount">MCacheMaxObjectCount</a></li><li><a href="#mcachemaxobjectsize">MCacheMaxObjectSize</a></li><li><a href="#mcacheminobjectsize">MCacheMinObjectSize</a></li><li><a href="#mcacheremovalalgorithm">MCacheRemovalAlgorithm</a></li><li><a href="#mcachesize">MCacheSize</a></li></ul><hr><h2><a name="MCacheMaxObjectCount">MCacheMaxObjectCount</a> <a name="mcachemaxobjectcount">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap"><strong>Description:
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</strong></td><td>The maximum number of objects allowed to be placed in the cache</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
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</a></td><td>MCacheMaxObjectCount <em>value</em></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Default" class="help">Default:
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</a></td><td><code>MCacheMaxObjectCount 1009</code></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
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</a></td><td>server config</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
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</a></td><td>Experimental</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
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</a></td><td>mod_mem_cache</td></tr></table></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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<blockquote><table><tr><td bgcolor="#ffe5f5">
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The size must be greater than <code class="directive">MCacheMinObjectSize</code>.
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</td></tr></table></blockquote>
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<blockquote><table><tr><td bgcolor="#e0e5f5">
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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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</td></tr></table></blockquote>
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<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
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MCacheMaxObjectCount 13001 <br>
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</code></td></tr></table></blockquote>
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<hr><h2><a name="MCacheMaxObjectSize">MCacheMaxObjectSize</a> <a name="mcachemaxobjectsize">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap"><strong>Description:
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</strong></td><td>The maximum size (in bytes) of an object to be placed in the cache</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
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</a></td><td>MCacheMaxObjectSize <em>bytes</em></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Default" class="help">Default:
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</a></td><td><code>MCacheMaxObjectSize 10000</code></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
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</a></td><td>server config</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
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</a></td><td>Experimental</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
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</a></td><td>mod_mem_cache</td></tr></table></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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<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
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MCacheMaxObjectSize 6400000 <br>
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</code></td></tr></table></blockquote>
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<hr><h2><a name="MCacheMinObjectSize">MCacheMinObjectSize</a> <a name="mcacheminobjectsize">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap"><strong>Description:
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</strong></td><td>The minimum size (in bytes) of an object to be placed in the cache</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
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</a></td><td>MCacheMinObjectSize <em>bytes</em></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Default" class="help">Default:
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</a></td><td><code>MCacheMinObjectSize 0</code></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
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</a></td><td>server config</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
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</a></td><td>Experimental</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
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</a></td><td>mod_mem_cache</td></tr></table></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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<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
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MCacheMinObjectSize 10000 <br>
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</code></td></tr></table></blockquote>
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<hr><h2><a name="MCacheRemovalAlgorithm">MCacheRemovalAlgorithm</a> <a name="mcacheremovalalgorithm">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap"><strong>Description:
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</strong></td><td>The algorithm used to remove entries from the cache</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
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</a></td><td>MCacheRemovalAlgorithm <em>algorithm</em></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Default" class="help">Default:
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</a></td><td><code>MCacheRemovalAlgorithm GDSF</code></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
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</a></td><td>server config</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
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</a></td><td>Experimental</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
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</a></td><td>mod_mem_cache</td></tr></table></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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<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
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MCacheRemovalAlgorithm GDSF <br>
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MCacheRemovalAlgorithm LRU <br>
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</code></td></tr></table></blockquote>
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<hr><h2><a name="MCacheSize">MCacheSize</a> <a name="mcachesize">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td nowrap="nowrap"><strong>Description:
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</strong></td><td>The maximum amount of memory used by the cache in KBytes</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
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</a></td><td>MCacheSize <em>KBytes</em></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Default" class="help">Default:
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</a></td><td><code>MCacheSize 100</code></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
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</a></td><td>server config</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
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</a></td><td>Experimental</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
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</a></td><td>mod_mem_cache</td></tr></table></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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<blockquote><table><tr><td bgcolor="#ffe5f5">
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The size must be greater than <code class="directive">MCacheMaxObjectSize</code>.
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</td></tr></table></blockquote>
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<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
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MCacheSize 700000 <br>
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</code></td></tr></table></blockquote>
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<hr></blockquote><h3 align="center">Apache HTTP Server Version 2.0</h3><a href="./"><img src="../images/index.gif" alt="Index"></a><a href="../"><img src="../images/home.gif" alt="Home"></a></body></html> |