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| <div id="preamble"><h1>Module Apache mod_lbmethod_byrequests</h1> |
| <div class="toplang"> |
| <p><span>Langues Disponibles: </span><a href="../en/mod/mod_lbmethod_byrequests.html" hreflang="en" rel="alternate" title="English"> en </a> | |
| <a href="../fr/mod/mod_lbmethod_byrequests.html" title="Français"> fr </a></p> |
| </div> |
| <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Algorithme de planification avec répartition de charge du |
| traitement des requêtes 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 de Module:</a></th><td>lbmethod_byrequests_module</td></tr> |
| <tr><th><a href="module-dict.html#SourceFile">Fichier Source:</a></th><td>mod_lbmethod_byrequests.c</td></tr> |
| <tr><th><a href="module-dict.html#Compatibility">Compatibilité:</a></th><td>Dissocié de <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> dans la |
| version 2.3</td></tr></table> |
| <h3>Sommaire</h3> |
| |
| <p>Ce module ne fournit pas lui-même de directive de configuration. Il |
| nécessite les services de <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code>, et |
| fournit la méthode de répartition de charge <code>byrequests</code>.</p> |
| </div> |
| <div id="quickview"><h3>Sujets</h3> |
| <ul id="topics"> |
| <li><img alt="" src="../images/down.gif" /> <a href="#requests">Algorithme d'attribution des requêtes</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__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_lbmethod_byrequests">Problèmes 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> |
| <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> |
| <li><a href="#comments_section">Commentaires</a></li></ul></div> |
| <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> |
| <div class="section"> |
| <h2><a name="requests" id="requests">Algorithme d'attribution des requêtes</a> <a title="Lien permanent" href="#requests" class="permalink">¶</a></h2> |
| |
| <p>Activé via <code>lbmethod=byrequests</code>, ce planificateur a |
| été conçu dans le but de distribuer les requêtes à tous les |
| processus worker afin qu'ils traitent tous le nombre de requêtes |
| pour lequel ils ont été configurés. Il fonctionne de la manière |
| suivante : </p> |
| |
| <p><dfn>lbfactor</dfn> correspond à la <em>quantité de travail que |
| nous attendons de ce processus worker</em>, ou en d'autres termes |
| son <em>quota de travail</em>. C'est une valeur normalisée |
| représentant leur part du travail à accomplir.</p> |
| |
| <p><dfn>lbstatus</dfn> représente <em>combien il est urgent que |
| ce processus worker travaille pour remplir son quota de |
| travail</em>.</p> |
| |
| <p>Le <dfn>worker</dfn> est un membre du dispositif de répartition |
| de charge, en général un serveur distant traitant un des protocoles |
| supportés.</p> |
| |
| <p>On distribue à chaque processus worker son quota de travail, puis |
| on regarde celui qui a le plus besoin de travailler |
| (le plus grand lbstatus). Ce processus est alors sélectionné pour |
| travailler, et son lbstatus diminué de l'ensemble des quotas de |
| travail que nous avons distribués à tous les processus. La somme de |
| tous les lbstatus n'est ainsi pas modifiée, et nous pouvons |
| distribuer les requêtes selon nos souhaits.</p> |
| |
| <p>Si certains processus workers sont désactivés, les autres feront |
| l'objet d'une planification normale.</p> |
| |
| <div class="example"><pre><code>for each worker in workers |
| worker lbstatus += worker lbfactor |
| total factor += worker lbfactor |
| if worker lbstatus > candidate lbstatus |
| candidate = worker |
| |
| candidate lbstatus -= total factor</code></pre></div> |
| |
| <p>Si un répartiteur de charge est configuré comme suit :</p> |
| |
| <table><tr><th>worker</th> |
| <th class="data">a</th> |
| <th class="data">b</th> |
| <th class="data">c</th> |
| <th class="data">d</th></tr> |
| <tr><th>lbfactor</th> |
| <td class="data">25</td> |
| <td class="data">25</td> |
| <td class="data">25</td> |
| <td class="data">25</td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data">0</td> |
| <td class="data">0</td> |
| <td class="data">0</td> |
| <td class="data">0</td></tr> |
| </table> |
| |
| <p>Et si <var>b</var> est désactivé, la planification suivante est |
| mise en oeuvre :</p> |
| |
| <table><tr><th>worker</th> |
| <th class="data">a</th> |
| <th class="data">b</th> |
| <th class="data">c</th> |
| <th class="data">d</th></tr> |
| <tr><th>lbstatus</th> |
| <td class="data"><em>-50</em></td> |
| <td class="data">0</td> |
| <td class="data">25</td> |
| <td class="data">25</td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data">-25</td> |
| <td class="data">0</td> |
| <td class="data"><em>-25</em></td> |
| <td class="data">50</td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data">0</td> |
| <td class="data">0</td> |
| <td class="data">0</td> |
| <td class="data"><em>0</em></td></tr> |
| <tr><td class="data" colspan="5">(repeat)</td></tr> |
| </table> |
| |
| <p>C'est à dire la chronologie suivante : <var>a</var> <var>c</var> |
| <var>d</var> |
| <var>a</var> <var>c</var> <var>d</var> <var>a</var> <var>c</var> |
| <var>d</var> ... Veuillez noter que :</p> |
| |
| <table><tr><th>worker</th> |
| <th class="data">a</th> |
| <th class="data">b</th> |
| <th class="data">c</th> |
| <th class="data">d</th></tr> |
| <tr><th>lbfactor</th> |
| <td class="data">25</td> |
| <td class="data">25</td> |
| <td class="data">25</td> |
| <td class="data">25</td></tr> |
| </table> |
| |
| <p>A le même effet que :</p> |
| |
| <table><tr><th>worker</th> |
| <th class="data">a</th> |
| <th class="data">b</th> |
| <th class="data">c</th> |
| <th class="data">d</th></tr> |
| <tr><th>lbfactor</th> |
| <td class="data">1</td> |
| <td class="data">1</td> |
| <td class="data">1</td> |
| <td class="data">1</td></tr> |
| </table> |
| |
| <p>Ceci est dû au fait que toutes les valeurs de <dfn>lbfactor</dfn> |
| sont normalisées et évaluées en fonction des autres. Avec :</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">4</td> |
| <td class="data">1</td></tr> |
| </table> |
| |
| <p>le processus <var>b</var> va, en moyenne, se voir assigner 4 fois |
| plus de requêtes que <var>a</var> et <var>c</var>.</p> |
| |
| <p>La configuration suivante, asymétrique, fonctionne comme on peut |
| s'y attendre :</p> |
| |
| <table><tr><th>worker</th> |
| <th class="data">a</th> |
| <th class="data">b</th></tr> |
| <tr><th>lbfactor</th> |
| <td class="data">70</td> |
| <td class="data">30</td></tr> |
| <tr><td class="data" colspan="2"> </td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data"><em>-30</em></td> |
| <td class="data">30</td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data">40</td> |
| <td class="data"><em>-40</em></td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data"><em>10</em></td> |
| <td class="data">-10</td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data"><em>-20</em></td> |
| <td class="data">20</td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data"><em>-50</em></td> |
| <td class="data">50</td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data">20</td> |
| <td class="data"><em>-20</em></td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data"><em>-10</em></td> |
| <td class="data">10</td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data"><em>-40</em></td> |
| <td class="data">40</td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data">30</td> |
| <td class="data"><em>-30</em></td></tr> |
| <tr><th>lbstatus</th> |
| <td class="data"><em>0</em></td> |
| <td class="data">0</td></tr> |
| <tr><td class="data" colspan="3">(repeat)</td></tr> |
| </table> |
| |
| <p>Après 10 distributions, la planification se répète et 7 |
| <var>a</var> sont sélectionnés avec 3 <var>b</var> intercalés.</p> |
| </div> |
| </div> |
| <div class="bottomlang"> |
| <p><span>Langues Disponibles: </span><a href="../en/mod/mod_lbmethod_byrequests.html" hreflang="en" rel="alternate" title="English"> en </a> | |
| <a href="../fr/mod/mod_lbmethod_byrequests.html" title="Français"> fr </a></p> |
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