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<title>mod_lbmethod_byrequests - Serveur Apache HTTP Version 2.5</title>
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<div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossaire</a> | <a href="../sitemap.html">Plan du site</a></p>
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<p class="apache">Serveur Apache HTTP Version 2.5</p>
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<img alt="" src="../images/feather.png" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">Serveur HTTP</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Modules</a></div>
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<div id="page-content">
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<div id="preamble"><h1>Module Apache mod_lbmethod_byrequests</h1>
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<div class="toplang">
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<p><span>Langues Disponibles: </span><a href="../en/mod/mod_lbmethod_byrequests.html" hreflang="en" rel="alternate" title="English"> en </a> |
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<a href="../fr/mod/mod_lbmethod_byrequests.html" title="Fran<61>ais"> fr </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Algorithme de planification avec r<>partition de charge du
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traitement des requ<71>tes pour le module
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<code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code></td></tr>
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<tr><th><a href="module-dict.html#Status">Statut:</a></th><td>Extension</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Identificateur<75>de<64>Module:</a></th><td>lbmethod_byrequests_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Fichier<65>Source:</a></th><td>mod_lbmethod_byrequests.c</td></tr>
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<tr><th><a href="module-dict.html#Compatibility">Compatibilit<69>:</a></th><td>Dissoci<63> de <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> dans la
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version 2.3</td></tr></table>
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<h3>Sommaire</h3>
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<p>Ce module ne fournit pas lui-m<>me de directive de configuration. Il
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n<EFBFBD>cessite les services de <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code>, et
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fournit la m<>thode de r<>partition de charge <code>byrequests</code>.</p>
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</div>
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<div id="quickview"><h3>Sujets</h3>
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<ul id="topics">
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<li><img alt="" src="../images/down.gif" /> <a href="#requests">Algorithme d'attribution des requ<71>tes</a></li>
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</ul><h3 class="directives">Directives</h3>
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<p>Ce module ne fournit aucune directive.</p>
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<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__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_lbmethod_byrequests">Probl<62>mes connus</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_lbmethod_byrequests">Signaler un bug</a></li></ul><h3>Voir aussi</h3>
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<ul class="seealso">
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<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
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<li><code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code></li>
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<li><a href="#comments_section">Commentaires</a></li></ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="requests" id="requests">Algorithme d'attribution des requ<71>tes</a></h2>
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<p>Activ<69> via <code>lbmethod=byrequests</code>, ce planificateur <20>
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<20>t<EFBFBD> con<6F>u dans le but de distribuer les requ<71>tes <20> tous les
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processus worker afin qu'ils traitent tous le nombre de requ<71>tes
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pour lequel ils ont <20>t<EFBFBD> configur<75>s. Il fonctionne de la mani<6E>re
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suivante : </p>
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<p><dfn>lbfactor</dfn> correspond <20> la <em>quantit<69> de travail que
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nous attendons de ce processus worker</em>, ou en d'autres termes
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son <em>quota de travail</em>. C'est une valeur normalis<69>e
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repr<70>sentant leur part du travail <20> accomplir.</p>
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<p><dfn>lbstatus</dfn> repr<70>sente <em>combien il est urgent que
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ce processus worker travaille pour remplir son quota de
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travail</em>.</p>
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<p>Le <dfn>worker</dfn> est un membre du dispositif de r<>partition
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de charge, en g<>n<EFBFBD>ral un serveur distant traitant un des protocoles
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support<72>s.</p>
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<p>On distribue <20> chaque processus worker son quota de travail, puis
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on regarde celui qui a le plus besoin de travailler
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(le plus grand lbstatus). Ce processus est alors s<>lectionn<6E> pour
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travailler, et son lbstatus diminu<6E> de l'ensemble des quotas de
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travail que nous avons distribu<62>s <20> tous les processus. La somme de
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tous les lbstatus n'est ainsi pas modifi<66>e, et nous pouvons
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distribuer les requ<71>tes selon nos souhaits.</p>
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<p>Si certains processus workers sont d<>sactiv<69>s, les autres feront
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l'objet d'une planification normale.</p>
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<div class="example"><pre><code>for each worker in workers
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worker lbstatus += worker lbfactor
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total factor += worker lbfactor
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if worker lbstatus > candidate lbstatus
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candidate = worker
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candidate lbstatus -= total factor</code></pre></div>
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<p>Si un r<>partiteur de charge est configur<75> comme suit :</p>
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<table><tr><th>worker</th>
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<th class="data">a</th>
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<th class="data">b</th>
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<th class="data">c</th>
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<th class="data">d</th></tr>
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<tr><th>lbfactor</th>
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<td class="data">25</td>
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<td class="data">25</td>
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<td class="data">25</td>
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<td class="data">25</td></tr>
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<tr><th>lbstatus</th>
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<td class="data">0</td>
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<td class="data">0</td>
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<td class="data">0</td>
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<td class="data">0</td></tr>
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</table>
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<p>Et si <var>b</var> est d<>sactiv<69>, la planification suivante est
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mise en oeuvre :</p>
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<table><tr><th>worker</th>
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<th class="data">a</th>
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<th class="data">b</th>
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<th class="data">c</th>
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<th class="data">d</th></tr>
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<tr><th>lbstatus</th>
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<td class="data"><em>-50</em></td>
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<td class="data">0</td>
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<td class="data">25</td>
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<td class="data">25</td></tr>
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<tr><th>lbstatus</th>
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<td class="data">-25</td>
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<td class="data">0</td>
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<td class="data"><em>-25</em></td>
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<td class="data">50</td></tr>
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<tr><th>lbstatus</th>
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<td class="data">0</td>
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<td class="data">0</td>
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<td class="data">0</td>
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<td class="data"><em>0</em></td></tr>
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<tr><td class="data" colspan="5">(repeat)</td></tr>
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</table>
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<p>C'est <20> dire la chronologie suivante : <var>a</var> <var>c</var>
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<var>d</var>
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<var>a</var> <var>c</var> <var>d</var> <var>a</var> <var>c</var>
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<var>d</var> ... Veuillez noter que :</p>
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<table><tr><th>worker</th>
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<th class="data">a</th>
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<th class="data">b</th>
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<th class="data">c</th>
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<th class="data">d</th></tr>
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<tr><th>lbfactor</th>
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<td class="data">25</td>
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<td class="data">25</td>
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<td class="data">25</td>
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<td class="data">25</td></tr>
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</table>
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<p>A le m<>me effet que :</p>
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<table><tr><th>worker</th>
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<th class="data">a</th>
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<th class="data">b</th>
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<th class="data">c</th>
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<th class="data">d</th></tr>
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<tr><th>lbfactor</th>
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<td class="data">1</td>
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<td class="data">1</td>
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<td class="data">1</td>
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<td class="data">1</td></tr>
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</table>
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<p>Ceci est d<> au fait que toutes les valeurs de <dfn>lbfactor</dfn>
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sont normalis<69>es et <20>valu<6C>es en fonction des autres. Avec :</p>
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<table><tr><th>worker</th>
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<th class="data">a</th>
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<th class="data">b</th>
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<th class="data">c</th></tr>
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<tr><th>lbfactor</th>
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<td class="data">1</td>
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<td class="data">4</td>
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<td class="data">1</td></tr>
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</table>
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<p>le processus <var>b</var> va, en moyenne, se voir assigner 4 fois
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plus de requ<71>tes que <var>a</var> et <var>c</var>.</p>
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<p>La configuration suivante, asym<79>trique, fonctionne comme on peut
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s'y attendre :</p>
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<table><tr><th>worker</th>
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<th class="data">a</th>
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<th class="data">b</th></tr>
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<tr><th>lbfactor</th>
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<td class="data">70</td>
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<td class="data">30</td></tr>
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<tr><td class="data" colspan="2"> </td></tr>
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<tr><th>lbstatus</th>
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<td class="data"><em>-30</em></td>
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<td class="data">30</td></tr>
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<tr><th>lbstatus</th>
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<td class="data">40</td>
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<td class="data"><em>-40</em></td></tr>
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<tr><th>lbstatus</th>
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<td class="data"><em>10</em></td>
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<td class="data">-10</td></tr>
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<tr><th>lbstatus</th>
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<td class="data"><em>-20</em></td>
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<td class="data">20</td></tr>
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<tr><th>lbstatus</th>
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<td class="data"><em>-50</em></td>
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<td class="data">50</td></tr>
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<tr><th>lbstatus</th>
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<td class="data">20</td>
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<td class="data"><em>-20</em></td></tr>
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<tr><th>lbstatus</th>
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<td class="data"><em>-10</em></td>
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<td class="data">10</td></tr>
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<tr><th>lbstatus</th>
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<td class="data"><em>-40</em></td>
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<td class="data">40</td></tr>
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<tr><th>lbstatus</th>
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<td class="data">30</td>
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<td class="data"><em>-30</em></td></tr>
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<tr><th>lbstatus</th>
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<td class="data"><em>0</em></td>
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<td class="data">0</td></tr>
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<tr><td class="data" colspan="3">(repeat)</td></tr>
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</table>
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<p>Apr<70>s 10 distributions, la planification se r<>p<EFBFBD>te et 7
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<var>a</var> sont s<>lectionn<6E>s avec 3 <var>b</var> intercal<61>s.</p>
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</div>
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</div>
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<p><span>Langues Disponibles: </span><a href="../en/mod/mod_lbmethod_byrequests.html" hreflang="en" rel="alternate" title="English"> en </a> |
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</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Commentaires</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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