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<p class="apache">Serveur HTTP Apache Version 2.4</p>
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<div id="preamble"><h1>Module Apache mod_lbmethod_bybusyness</h1>
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<p><span>Langues Disponibles: </span><a href="../en/mod/mod_lbmethod_bybusyness.html" hreflang="en" rel="alternate" title="English">&nbsp;en&nbsp;</a> |
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Algorithme de planification avec r&eacute;partition de charge de
l'attribution des requ&ecirc;tes en attente pour le module
<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">Statut:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Identificateur&nbsp;de&nbsp;Module:</a></th><td>lbmethod_bybusyness_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Fichier&nbsp;Source:</a></th><td>mod_lbmethod_bybusyness.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibilit&eacute;:</a></th><td>Dissoci&eacute; de <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> depuis la
version 2.3</td></tr></table>
<h3>Sommaire</h3>

<p>Ce module ne fournit pas lui-m&ecirc;me de directive de configuration. Il
n&eacute;cessite les services de <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code>, et
fournit la m&eacute;thode de r&eacute;partition de charge <code>bybusyness</code>.</p>
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<div id="quickview"><h3>Sujets</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif"> <a href="#busyness">Algorithme d'attribution des requ&ecirc;tes en attente</a></li>
</ul><h3 class="directives">Directives</h3>
<p>Ce module ne fournit aucune directive.</p>
<h3>Traitement des bugs</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">Journal des modifications de httpd</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_lbmethod_bybusyness">Probl&egrave;mes connus</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_lbmethod_bybusyness">Signaler un bug</a></li></ul><h3>Voir aussi</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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<h2 id="busyness">Algorithme d'attribution des requ&ecirc;tes en attente <a title="Lien permanent" href="#busyness" class="permalink">&para;</a></h2>

    

    <p>Activ&eacute; via <code>lbmethod=bybusyness</code>, ce planificateur
    surveille le nombre de requ&ecirc;tes assign&eacute;es &agrave; chaque processus worker
    &agrave; l'instant pr&eacute;sent. Une nouvelle requ&ecirc;te est automatiquement
    assign&eacute;e au processus worker auquel est assign&eacute; le plus petit nombre de
    requ&ecirc;tes. Ceci s'av&egrave;re utile dans le cas o&ugrave; les
    processus worker mettent en file d'attente les requ&ecirc;tes entrantes
    ind&eacute;pendamment d'Apache, et permet de s'assurer que la longueur des
    files reste raisonnable, et qu'une requ&ecirc;te est toujours assign&eacute;e au
    processus worker qui sera &agrave; m&ecirc;me de la servir le plus
    rapidement et avec une latence r&eacute;duite.</p>

    <p>Si plusieurs processus worker s'av&egrave;rent les moins charg&eacute;s, le
    choix d'un de ces derniers est effectu&eacute; &agrave; partir des statistiques
    (et des estimations de charges) qu'utilise la m&eacute;thode de d&eacute;compte
    des requ&ecirc;tes. Au fil du temps, la distribution des t&acirc;ches finit par
    ressembler &agrave; celle de <code>byrequests</code> (tel qu'impl&eacute;ment&eacute; par
    <code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code>).</p>

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