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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:01:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:01:30 +0000
commit6beeb1b708550be0d4a53b272283e17e5e35fe17 (patch)
tree1ce8673d4aaa948e5554000101f46536a1e4cc29 /docs/manual/mod/mod_lbmethod_byrequests.html.fr.utf8
parentInitial commit. (diff)
downloadapache2-6beeb1b708550be0d4a53b272283e17e5e35fe17.tar.xz
apache2-6beeb1b708550be0d4a53b272283e17e5e35fe17.zip
Adding upstream version 2.4.57.upstream/2.4.57upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="fr" xml:lang="fr"><head>
+<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
+<!--
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ This file is generated from xml source: DO NOT EDIT
+ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ -->
+<title>mod_lbmethod_byrequests - Serveur HTTP Apache Version 2.4</title>
+<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
+<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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+<script src="../style/scripts/prettify.min.js" type="text/javascript">
+</script>
+
+<link href="../images/favicon.ico" rel="shortcut icon" /></head>
+<body>
+<div id="page-header">
+<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.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>
+<p class="apache">Serveur HTTP Apache Version 2.4</p>
+<img alt="" src="../images/feather.png" /></div>
+<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
+<div id="path">
+<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">Serveur HTTP</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.4</a> &gt; <a href="./">Modules</a></div>
+<div id="page-content">
+<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">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_lbmethod_byrequests.html" title="Français">&nbsp;fr&nbsp;</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"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><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__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_lbmethod_byrequests">Problèmes connus</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;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></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 &gt; 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">&nbsp;</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">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_lbmethod_byrequests.html" title="Français">&nbsp;fr&nbsp;</a></p>
+</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&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed 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 Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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