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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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| <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> |
| </div> |
| <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#Status">Status:</a></th><td>Extension</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> |
| |
| <p>This module does not provide any configuration directives of its own. |
| It requires the services of <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code>, and |
| provides the <code>bytraffic</code> load balancing method..</p> |
| </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"> |
| <li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li> |
| <li><code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code></li> |
| </ul></div> |
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| <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 either seen |
| or produced.</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> |
| |
| <p>Note: input and output bytes are weighted the same.</p> |
| |
| </div> |
| </div> |
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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 2011 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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