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Trim trailing whitespace... no func change git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1174747 13f79535-47bb-0310-9956-ffa450edef68
79 lines
3.0 KiB
XML
79 lines
3.0 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_bytraffic.xml.meta">
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<name>mod_lbmethod_bytraffic</name>
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<description>Weighted Traffic 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_bytraffic.c</sourcefile>
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<identifier>lbmethod_bytraffic_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>bytraffic</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="traffic">
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<title>Weighted Traffic Counting Algorithm</title>
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<p>Enabled via <code>lbmethod=bytraffic</code>, the idea behind this
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scheduler is very similar to the Request Counting method, with
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the following changes:</p>
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<p><dfn>lbfactor</dfn> is <em>how much traffic, in bytes, we want
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this worker to handle</em>. This is also a normalized value
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representing their "share" of the amount of work to be done,
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but instead of simply counting the number of requests, we take
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into account the amount of traffic this worker has either seen
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or produced.</p>
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<p>If a balancer is configured as follows:</p>
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<table style="data">
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<tr><th>worker</th>
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<th>a</th>
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<th>b</th>
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<th>c</th></tr>
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<tr><th>lbfactor</th>
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<td>1</td>
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<td>2</td>
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<td>1</td></tr>
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</table>
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<p>Then we mean that we want <var>b</var> to process twice the
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amount of bytes than <var>a</var> or <var>c</var> should. It does
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not necessarily mean that <var>b</var> would handle twice as
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many requests, but it would process twice the I/O. Thus, the
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size of the request and response are applied to the weighting
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and selection algorithm.</p>
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<p>Note: input and output bytes are weighted the same.</p>
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</section>
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</modulesynopsis>
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