2.4.x/docs/manual/mod/mod_lbmethod_bybusyness.xml

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<modulesynopsis metafile="mod_lbmethod_bybusyness.xml.meta">

<name>mod_lbmethod_bybusyness</name>
<description>Pending Request Counting load balancer scheduler algorithm for <module
>mod_proxy_balancer</module></description>
<status>Extension</status>
<sourcefile>mod_lbmethod_bybusyness.c</sourcefile>
<identifier>lbmethod_bybusyness_module</identifier>
<compatibility>Split off from <module>mod_proxy_balancer</module> in 2.3</compatibility>

<summary>
<p>This module does not provide any configuration directives of its own.
It requires the services of <module>mod_proxy_balancer</module>, and
provides the <code>bybusyness</code> load balancing method.</p>
</summary>
<seealso><module>mod_proxy</module></seealso>
<seealso><module>mod_proxy_balancer</module></seealso>

<section id="busyness">

    <title>Pending Request Counting Algorithm</title>

    <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 <module>mod_lbmethod_byrequests</module>).</p>

</section>

</modulesynopsis>