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65 lines
2.8 KiB
XML
65 lines
2.8 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE manualpage SYSTEM "./style/manualpage.dtd">
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<?xml-stylesheet type="text/xsl" href="./style/manual.en.xsl"?>
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<!-- $LastChangedRevision$ -->
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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<manualpage metafile="socache.xml.meta">
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<title>Shared Object Cache in Apache HTTP Server</title>
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<summary>
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<p>The Shared Object Cache provides a means to share simple data
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across all a server's workers, regardless of <a href="mpm.html">thread
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and process models</a>. It is used where the advantages of sharing
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data across processes outweigh the performance overhead of
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inter-process communication.</p>
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</summary>
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<section id="providers">
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<title>Shared Object Cache Providers</title>
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<p>The shared object cache as such is an abstraction. Four different
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modules implement it. To use the cache, one or more of these modules
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must be present, and configured.</p>
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<p>The only configuration required is to select which cache provider
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to use. This is the responsibility of modules using the cache, and
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they enable selecton using directives such as
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<directive module="authn_socache">AuthnCacheSOCache</directive>,
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<directive module="ssl">SSLSessionCache</directive>, and
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<directive module="ssl">SSLStaplingCache</directive>.</p>
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<p>Currently available providers are:</p>
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<dl>
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<dt>"dbm" (mod_socache_dbm)</dt>
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<dd>This makes use of a DBM hash file.
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The choice of underlying DBM configuration may be configurable
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if the installed APR version supports multiple DBM implementations.</dd>
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<dt>"dc" (mod_socache_dc)</dt>
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<dd>This makes use of the <a href="http://www.distcache.org/">distcache</a>
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distributed session caching libraries.</dd>
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<dt>"mc" (mod_socache_memcache)</dt>
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<dd>This makes use of the <a href="http://memcached.org/">memcached</a>
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high-performance, distributed memory object caching system.</dd>
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<dt>"shmcb" (mod_socache_shmcb)</dt>
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<dd>This makes use of a high-performance cyclic buffer inside a
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shared memory segment.</dd>
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</dl>
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</section>
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</manualpage>
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