1<?xml version="1.0" encoding="ISO-8859-1"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- 4 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 5 This file is generated from xml source: DO NOT EDIT 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 --> 8<title>mod_lbmethod_bytraffic - Apache HTTP Server</title> 9<link href="/style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 10<link href="/style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 11<link href="/style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="/style/css/prettify.css" /> 12<script src="/style/scripts/prettify.min.js" type="text/javascript"> 13</script> 14 15<link href="/images/favicon.ico" rel="shortcut icon" /></head> 16<body> 17<div id="page-header"> 18<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p> 19<p class="apache">Apache HTTP Server Version 2.4</p> 20<img alt="" src="/images/feather.gif" /></div> 21<div class="up"><a href="./"><img title="<-" alt="<-" src="/images/left.gif" /></a></div> 22<div id="path"> 23<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div> 24<div id="page-content"> 25<div id="preamble"><h1>Apache Module mod_lbmethod_bytraffic</h1> 26<div class="toplang"> 27<p><span>Available Languages: </span><a href="/en/mod/mod_lbmethod_bytraffic.html" title="English"> en </a> | 28<a href="/fr/mod/mod_lbmethod_bytraffic.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p> 29</div> 30<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Weighted Traffic Counting load balancer scheduler algorithm for <code class="module"><a href="/mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code></td></tr> 31<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr> 32<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>lbmethod_bytraffic_module</td></tr> 33<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_lbmethod_bytraffic.c</td></tr> 34<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Split off from <code class="module"><a href="/mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> in 2.3</td></tr></table> 35<h3>Summary</h3> 36 37<p>This module does not provide any configuration directives of its own. 38It requires the services of <code class="module"><a href="/mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code>, and 39provides the <code>bytraffic</code> load balancing method..</p> 40</div> 41<div id="quickview"><h3 class="directives">Directives</h3> 42<p>This module provides no 43 directives.</p> 44<h3>Topics</h3> 45<ul id="topics"> 46<li><img alt="" src="/images/down.gif" /> <a href="#traffic">Weighted Traffic Counting Algorithm</a></li> 47</ul><h3>See also</h3> 48<ul class="seealso"> 49<li><code class="module"><a href="/mod/mod_proxy.html">mod_proxy</a></code></li> 50<li><code class="module"><a href="/mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code></li> 51</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 52<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div> 53<div class="section"> 54<h2><a name="traffic" id="traffic">Weighted Traffic Counting Algorithm</a></h2> 55 56 <p>Enabled via <code>lbmethod=bytraffic</code>, the idea behind this 57 scheduler is very similar to the Request Counting method, with 58 the following changes:</p> 59 60 <p><dfn>lbfactor</dfn> is <em>how much traffic, in bytes, we want 61 this worker to handle</em>. This is also a normalized value 62 representing their "share" of the amount of work to be done, 63 but instead of simply counting the number of requests, we take 64 into account the amount of traffic this worker has either seen 65 or produced.</p> 66 67 <p>If a balancer is configured as follows:</p> 68 69 <table><tr><th>worker</th> 70 <th class="data">a</th> 71 <th class="data">b</th> 72 <th class="data">c</th></tr> 73<tr><th>lbfactor</th> 74 <td class="data">1</td> 75 <td class="data">2</td> 76 <td class="data">1</td></tr> 77</table> 78 79 <p>Then we mean that we want <var>b</var> to process twice the 80 amount of bytes than <var>a</var> or <var>c</var> should. It does 81 not necessarily mean that <var>b</var> would handle twice as 82 many requests, but it would process twice the I/O. Thus, the 83 size of the request and response are applied to the weighting 84 and selection algorithm.</p> 85 86 <p>Note: input and output bytes are weighted the same.</p> 87 88</div> 89</div> 90<div class="bottomlang"> 91<p><span>Available Languages: </span><a href="/en/mod/mod_lbmethod_bytraffic.html" title="English"> en </a> | 92<a href="/fr/mod/mod_lbmethod_bytraffic.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p> 93</div><div class="top"><a href="#page-header"><img src="/images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. 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