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| <title>mod_lbmethod_bybusyness - Apache HTTP Server</title> |
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| <p class="apache">Apache HTTP Server Version 2.5</p> |
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| <div id="preamble"><h1>Apache Module mod_lbmethod_bybusyness</h1> |
| <div class="toplang"> |
| <p><span>Available Languages: </span><a href="../en/mod/mod_lbmethod_bybusyness.html" title="English"> en </a></p> |
| </div> |
| <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Pending Request 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_bybusyness_module</td></tr> |
| <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_lbmethod_bybusyness.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>bybusyness</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="#busyness">Pending Request 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="busyness" id="busyness">Pending Request Counting Algorithm</a></h2> |
| |
| |
| |
| <p>Enabled via <code>lbmethod=bybusyness</code>, this scheduler keeps |
| track of how many requests each worker is currently assigned at present. A new |
| request is automatically assigned to the worker with the lowest |
| number of active requests. This is useful in the case of workers |
| that queue incoming requests independently of Apache, to ensure that |
| queue length stays even and a request is always given to the worker |
| most likely to service it the fastest and reduce latency.</p> |
| |
| <p>In the case of multiple least-busy workers, the statistics (and |
| weightings) used by the Request Counting method are used to break the |
| tie. Over time, the distribution of work will come to resemble that |
| characteristic of <code>byrequests</code> (as implemented |
| by <code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code>).</p> |
| |
| </div> |
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| <p class="apache">Copyright 2012 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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