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<title>mod_lbmethod_bytraffic - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.3</p>
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<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 2.3</a> > <a href="./">Modules</a></div>
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<div id="preamble"><h1>Apache Module mod_lbmethod_bytraffic</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="/en/mod/mod_lbmethod_bytraffic.html" title="English"> en </a></p>
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<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>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>lbmethod_bytraffic_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_lbmethod_bytraffic.c</td></tr>
<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>
<h3>Summary</h3>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<p>This module provides no
directives.</p>
<h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="/images/down.gif" /> <a href="#traffic">Weighted Traffic Counting Algorithm</a></li>
</ul><h3>See also</h3>
<ul class="seealso">
</ul></div>
<div class="section">
<h2><a name="traffic" id="traffic">Weighted Traffic Counting Algorithm</a></h2>
<p>Enabled via <code>lbmethod=bytraffic</code>, the idea behind this
scheduler is very similar to the Request Counting method, with
the following changes:</p>
<p><dfn>lbfactor</dfn> is <em>how much traffic, in bytes, we want
this worker to handle</em>. This is also a normalized value
representing their "share" of the amount of work to be done,
but instead of simply counting the number of requests, we take
into account the amount of traffic this worker has seen.</p>
<p>If a balancer is configured as follows:</p>
<table><tr><th>worker</th>
<th class="data">a</th>
<th class="data">b</th>
<th class="data">c</th></tr>
<tr><th>lbfactor</th>
<td class="data">1</td>
<td class="data">2</td>
<td class="data">1</td></tr>
</table>
<p>Then we mean that we want <var>b</var> to process twice the
amount of bytes than <var>a</var> or <var>c</var> should. It does
not necessarily mean that <var>b</var> would handle twice as
many requests, but it would process twice the I/O. Thus, the
size of the request and response are applied to the weighting
and selection algorithm.</p>
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<p><span>Available Languages: </span><a href="/en/mod/mod_lbmethod_bytraffic.html" title="English"> en </a></p>
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<p class="apache">Copyright 2008 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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