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annotate xml/ru/docs/events.xml @ 554:ccb7451af1d8

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Documented the "worker_rlimit_sigpending" directive.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 26 Jun 2012 07:51:33 +0000
parents 32bde52db92c
children b4e34b473283
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 <!DOCTYPE article SYSTEM "../../../dtd/article.dtd">
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2
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3 <article name="Методы обработки соединений"
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4 link="/ru/docs/events.html"
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5 lang="ru">
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6
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7 <section>
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8
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9 <para>
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10 nginx поддерживает различные методы обработки соединений.
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11 Наличие того или иного метода зависит от используемой платформы.
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12 Если на платформе доступно сразу несколько методов, nginx обычно
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13 сам выбирает наиболее эффективный метод.
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14 Однако, при необходимости можно явно выбрать метод обработки
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15 соединений с помощью директивы
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16 <link doc="ngx_core_module.xml" id="use"/>.
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17 </para>
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18
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19 <para>
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20 Поддерживаются следующие методы обработки соединений:
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21 <list type="bullet">
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23 <listitem>
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24 <para>
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25 <literal>select</literal>&mdash;стандартный метод.
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26 Модуль для поддержки этого метода собирается автоматически,
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27 если на платформе не обнаружено более эффективного метода.
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28 Можно принудительно разрешить или запретить сборку этого модуля
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29 с помощью параметров <literal>--with-select_module</literal> и
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30 <literal>--without-select_module</literal>.
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31 </para>
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32 </listitem>
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33
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34 <listitem>
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35 <para>
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36 <literal>poll</literal>&mdash;стандартный метод.
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37 Модуль для поддержки этого метода собирается автоматически,
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38 если на платформе не обнаружено более эффективного метода.
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39 Можно принудительно разрешить или запретить сборку этого модуля
552
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40 с помощью параметров <literal>--with-poll_module</literal> и
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41 <literal>--without-poll_module</literal>.
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42 </para>
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43 </listitem>
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44
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45 <listitem>
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46 <para>
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47 <literal>kqueue</literal>&mdash;эффективный метод, используемый
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48 во FreeBSD 4.1+, OpenBSD 2.9+, NetBSD 2.0 и Mac OS X.
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49 <note>
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50 На двух-процессорных машинах под управлением некоторых старых версий
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51 Mac OS X использование kqueue может привести к kernel panic.
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52 </note>
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53 </para>
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54 </listitem>
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56 <listitem>
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57 <para>
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58 <literal>epoll</literal>&mdash;эффективный метод, используемый
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59 в Linux 2.6+.
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60 <note>
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61 В некоторых старых дистрибутивах, например SuSE 8.2,
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62 есть патчи для поддержки epoll ядром 2.4.
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63 </note>
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64 </para>
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65 </listitem>
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67 <listitem>
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68 <para>
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69 <literal>rtsig</literal>&mdash;real time signals, эффективный метод,
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70 используемый в Linux 2.2.19+.
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71 По умолчанию в общесистемной очереди событий может одновременно
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72 находиться не более 1024 сигналов.
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73 На нагруженных серверах может потребоваться увеличить размер очереди
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74 с помощью параметра ядра <path>/proc/sys/kernel/rtsig-max</path>.
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75 Однако, начиная с Linux 2.6.6-mm2, этого параметра уже нет и для каждого
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76 процесса существует отдельная очередь сигналов, размер которой
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77 ограничивается с помощью <literal>RLIMIT_SIGPENDING</literal>
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78 (см. также <link doc="ngx_core_module.xml" id="worker_rlimit_sigpending"/>).
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79 </para>
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81 <para>
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82 При переполнении очереди nginx сбрасывает её и начинает обрабатывать
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83 соединения с помощью метода <literal>poll</literal> до тех пор,
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84 пока ситуация не нормализуется.
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85 </para>
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86 </listitem>
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88 <listitem>
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89 <para>
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90 <literal>/dev/poll</literal>&mdash;эффективный метод, используемый
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91 в Solaris 7 11/99+, HP/UX 11.22+ (eventport), IRIX 6.5.15+
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92 и Tru64 UNIX 5.1A+.
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93 </para>
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94 </listitem>
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95
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96 <listitem>
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97 <para>
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98 <literal>eventport</literal>&mdash;event ports, эффективный метод,
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99 используемый в Solaris 10.
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100 <note>
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101 Во избежание kernel panic, нужно установить
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102 <link url="http://sunsolve.sun.com/search/document.do?assetkey=1-26-102485-1">патч</link>.
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103 </note>
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104 </para>
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105 </listitem>
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106
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107 </list>
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108 </para>
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109
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110 </section>
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111
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112 </article>