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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1174718 13f79535-47bb-0310-9956-ffa450edef68
62 lines
2.6 KiB
XML
62 lines
2.6 KiB
XML
<?xml version="1.0"?>
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<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.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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<modulesynopsis metafile="mod_lbmethod_bybusyness.xml.meta">
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<name>mod_lbmethod_bybusyness</name>
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<description>Pending Request Counting load balancer scheduler algorithm for <module
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>mod_proxy_balancer</module></description>
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<status>Extension</status>
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<sourcefile>mod_lbmethod_bybusyness.c</sourcefile>
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<identifier>lbmethod_bybusyness_module</identifier>
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<compatibility>Split off from <module>mod_proxy_balancer</module> in 2.3</compatibility>
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<summary>
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<p>This module does not provide any configuration directives of its own.
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It requires the services of <module>mod_proxy_balancer</module>, and
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provides the <code>bybusyness</code> load balancing method.</p>
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</summary>
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<seealso><module>mod_proxy</module></seealso>
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<seealso><module>mod_proxy_balancer</module></seealso>
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<section id="busyness">
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<title>Pending Request Counting Algorithm</title>
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<p>Enabled via <code>lbmethod=bybusyness</code>, this scheduler keeps
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track of how many requests each worker is currently assigned at present. A new
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request is automatically assigned to the worker with the lowest
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number of active requests. This is useful in the case of workers
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that queue incoming requests independently of Apache, to ensure that
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queue length stays even and a request is always given to the worker
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most likely to service it the fastest and reduce latency.</p>
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<p>In the case of multiple least-busy workers, the statistics (and
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weightings) used by the Request Counting method are used to break the
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tie. Over time, the distribution of work will come to resemble that
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characteristic of <code>byrequests</code> (as implemented
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by <module>mod_lbmethod_byrequests</module>).</p>
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</section>
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</modulesynopsis>
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