Mercurial > hg > nginx-site
annotate xml/en/docs/ngx_core_module.xml @ 1889:52e6eb31f3fc
Updated nginScript link on the "About" page.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 18 Jan 2017 15:33:34 +0300 |
parents | 3ed02f21146b |
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1 <?xml version="1.0"?> |
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2 |
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3 <!-- |
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4 Copyright (C) Igor Sysoev |
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5 Copyright (C) Nginx, Inc. |
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6 --> |
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7 |
63
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8 <!DOCTYPE module SYSTEM "../../../dtd/module.dtd"> |
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9 |
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10 <module name="Core functionality" |
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11 link="/en/docs/ngx_core_module.html" |
589 | 12 lang="en" |
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13 rev="22"> |
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14 |
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15 <section id="example" name="Example Configuration"> |
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16 |
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17 <para> |
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18 <example> |
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19 user www www; |
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20 worker_processes 2; |
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21 |
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22 error_log /var/log/nginx-error.log info; |
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23 |
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24 events { |
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25 use kqueue; |
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26 worker_connections 2048; |
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27 } |
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28 |
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29 ... |
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30 </example> |
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31 </para> |
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32 |
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33 </section> |
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34 |
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35 |
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36 <section id="directives" name="Directives"> |
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37 |
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38 <directive name="accept_mutex"> |
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39 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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40 <default>off</default> |
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41 <context>events</context> |
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42 |
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43 <para> |
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44 If <literal>accept_mutex</literal> is enabled, |
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45 worker processes will accept new connections by turn. |
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46 Otherwise, all worker processes will be notified about new connections, |
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47 and if volume of new connections is low, some of the worker processes |
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48 may just waste system resources. |
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49 <note> |
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50 There is no need to enable <literal>accept_mutex</literal> |
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51 on systems that support the |
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52 <link doc="events.xml" id="epoll">EPOLLEXCLUSIVE</link> flag (1.11.3) or |
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53 when using <link doc="http/ngx_http_core_module.xml" id="reuseport"/>. |
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54 </note> |
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55 <note> |
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56 Prior to version 1.11.3, the default value was <literal>on</literal>. |
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57 </note> |
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58 </para> |
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59 |
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60 </directive> |
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61 |
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62 |
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63 <directive name="accept_mutex_delay"> |
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64 <syntax><value>time</value></syntax> |
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65 <default>500ms</default> |
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66 <context>events</context> |
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67 |
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68 <para> |
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69 If <link id="accept_mutex"/> is enabled, specifies the maximum time |
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70 during which a worker process will try to restart accepting new |
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71 connections if another worker process is currently accepting |
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72 new connections. |
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73 </para> |
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74 |
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75 </directive> |
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76 |
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77 |
63
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78 <directive name="daemon"> |
271 | 79 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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80 <default>on</default> |
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81 <context>main</context> |
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82 |
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83 <para> |
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84 Determines whether nginx should become a daemon. |
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85 Mainly used during development. |
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86 </para> |
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87 |
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88 </directive> |
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89 |
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90 |
516
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91 <directive name="debug_connection"> |
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92 <syntax> |
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93 <value>address</value> | |
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94 <value>CIDR</value> | |
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95 <literal>unix:</literal></syntax> |
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96 <default/> |
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97 <context>events</context> |
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98 |
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99 <para> |
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100 Enables debugging log for selected client connections. |
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101 Other connections will use logging level set by the |
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102 <link id="error_log"/> directive. |
523 | 103 Debugged connections are specified by IPv4 or IPv6 (1.3.0, 1.2.1) |
104 address or network. | |
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105 A connection may also be specified using a hostname. |
523 | 106 For connections using UNIX-domain sockets (1.3.0, 1.2.1), |
107 debugging log is enabled by the “<literal>unix:</literal>” parameter. | |
516
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108 <example> |
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109 events { |
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110 debug_connection 127.0.0.1; |
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111 debug_connection localhost; |
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112 debug_connection 192.0.2.0/24; |
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113 debug_connection ::1; |
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114 debug_connection 2001:0db8::/32; |
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115 debug_connection unix:; |
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116 ... |
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117 } |
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118 </example> |
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119 <note> |
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120 For this directive to work, nginx needs to |
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121 be built with <literal>--with-debug</literal>, |
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122 see “<link doc="debugging_log.xml"/>”. |
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123 </note> |
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124 </para> |
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125 |
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126 </directive> |
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127 |
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128 |
574 | 129 <directive name="debug_points"> |
130 <syntax><literal>abort</literal> | <literal>stop</literal></syntax> | |
131 <default/> | |
132 <context>main</context> | |
133 | |
134 <para> | |
135 This directive is used for debugging. | |
136 </para> | |
137 | |
138 <para> | |
139 When internal error is detected, e.g. the leak of sockets on | |
140 restart of working processes, enabling <literal>debug_points</literal> | |
141 leads to a core file creation (<literal>abort</literal>) | |
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142 or to stopping of a process (<literal>stop</literal>) for further |
574 | 143 analysis using a system debugger. |
144 </para> | |
145 | |
146 </directive> | |
147 | |
148 | |
158
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149 <directive name="error_log"> |
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150 <syntax><value>file</value> [<value>level</value>]</syntax> |
158
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151 <default>logs/error.log error</default> |
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152 <context>main</context> |
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153 <context>http</context> |
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154 <context>mail</context> |
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155 <context>stream</context> |
158
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156 <context>server</context> |
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157 <context>location</context> |
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158 |
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159 <para> |
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160 Configures logging. |
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161 Several logs can be specified on the same level (1.5.2). |
158
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162 </para> |
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163 |
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164 <para> |
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165 The first parameter defines a <value>file</value> that will store the log. |
158
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166 <!-- |
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167 If filename is not absolute, it is prefixed with the prefix path. |
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168 --> |
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169 The special value <literal>stderr</literal> selects the standard error file. |
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170 Logging to <link doc="syslog.xml">syslog</link> can be configured by specifying |
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171 the “<literal>syslog:</literal>” prefix. |
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172 Logging to a |
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173 <link doc="debugging_log.xml" id="memory">cyclic memory buffer</link> |
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174 can be configured by specifying the “<literal>memory:</literal>” prefix and |
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175 buffer <value>size</value>, and is generally used for debugging (1.7.11). |
158
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176 </para> |
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177 |
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178 <para> |
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179 The second parameter determines the <value>level</value> of logging, |
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180 and can be one of the following: |
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181 <literal>debug</literal>, <literal>info</literal>, <literal>notice</literal>, |
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182 <literal>warn</literal>, <literal>error</literal>, <literal>crit</literal>, |
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183 <literal>alert</literal>, or <literal>emerg</literal>. |
158
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184 Log levels above are listed in the order of increasing severity. |
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185 Setting a certain log level will cause all messages of |
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186 the specified and more severe log levels to be logged. |
271 | 187 For example, the default level <literal>error</literal> will |
188 cause <literal>error</literal>, <literal>crit</literal>, | |
189 <literal>alert</literal>, and <literal>emerg</literal> messages | |
158
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190 to be logged. |
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191 If this parameter is omitted then <literal>error</literal> is used. |
158
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192 <note> |
271 | 193 For <literal>debug</literal> logging to work, nginx needs to |
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194 be built with <literal>--with-debug</literal>, |
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195 see “<link doc="debugging_log.xml"/>”. |
158
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196 </note> |
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197 |
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198 <note> |
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199 The directive can be specified on the |
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200 <literal>stream</literal> level |
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201 starting from version 1.7.11, |
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202 and on the <literal>mail</literal> level |
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203 starting from version 1.9.0. |
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204 </note> |
158
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205 </para> |
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206 |
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207 </directive> |
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208 |
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209 |
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210 <directive name="env"> |
271 | 211 <syntax><value>variable</value>[=<value>value</value>]</syntax> |
102
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212 <default>TZ</default> |
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213 <context>main</context> |
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214 |
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215 <para> |
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216 By default, nginx removes all environment variables inherited |
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217 from its parent process except the TZ variable. |
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218 This directive allows preserving some of the inherited variables, |
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219 changing their values, or creating new environment variables. |
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220 These variables are then: |
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221 <list type="bullet"> |
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222 |
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223 <listitem> |
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224 inherited during a <link doc="control.xml" id="upgrade">live upgrade</link> |
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225 of an executable file; |
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226 </listitem> |
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227 |
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228 <listitem> |
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229 used by the |
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230 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link> module; |
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231 </listitem> |
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232 |
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233 <listitem> |
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234 used by worker processes. |
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235 One should bear in mind that controlling system libraries in this way |
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236 is not always possible as it is common for libraries to check |
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237 variables only during initialization, well before they can be set |
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238 using this directive. |
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239 An exception from this is an above mentioned |
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240 <link doc="control.xml" id="upgrade">live upgrade</link> |
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241 of an executable file. |
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242 </listitem> |
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243 |
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244 </list> |
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245 </para> |
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246 |
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247 <para> |
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248 The TZ variable is always inherited and available to the |
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249 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link> |
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250 module, unless it is configured explicitly. |
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251 </para> |
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252 |
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253 <para> |
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254 Usage example: |
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255 <example> |
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256 env MALLOC_OPTIONS; |
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257 env PERL5LIB=/data/site/modules; |
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258 env OPENSSL_ALLOW_PROXY_CERTS=1; |
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259 </example> |
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260 </para> |
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261 |
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262 <para> |
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263 <note> |
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264 The NGINX environment variable is used internally by nginx |
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265 and should not be set directly by the user. |
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266 </note> |
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267 </para> |
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268 |
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269 </directive> |
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270 |
249 | 271 |
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272 <directive name="events"> |
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273 <syntax block="yes"/> |
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274 <default/> |
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275 <context>main</context> |
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276 |
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277 <para> |
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278 Provides the configuration file context in which the directives that |
556
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279 affect connection processing are specified. |
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280 </para> |
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281 |
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282 </directive> |
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283 |
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284 |
63
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285 <directive name="include"> |
271 | 286 <syntax><value>file</value> | <value>mask</value></syntax> |
63
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287 <default/> |
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288 <context/> |
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289 |
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290 <para> |
271 | 291 Includes another <value>file</value>, or files matching the |
292 specified <value>mask</value>, into configuration. | |
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293 Included files should consist of |
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294 syntactically correct directives and blocks. |
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295 </para> |
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296 |
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297 <para> |
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298 Usage example: |
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299 <example> |
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300 include mime.types; |
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301 include vhosts/*.conf; |
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302 </example> |
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303 </para> |
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304 |
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305 </directive> |
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306 |
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307 |
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308 <directive name="load_module"> |
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309 <syntax><value>file</value></syntax> |
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310 <default/> |
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311 <context>main</context> |
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312 <appeared-in>1.9.11</appeared-in> |
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313 |
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314 <para> |
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315 Loads a dynamic module. |
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316 </para> |
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317 |
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318 <para> |
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319 Example: |
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320 <example> |
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321 load_module modules/ngx_mail_module.so; |
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322 </example> |
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323 </para> |
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324 |
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325 </directive> |
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326 |
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327 |
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328 <directive name="lock_file"> |
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329 <syntax><value>file</value></syntax> |
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330 <default>logs/nginx.lock</default> |
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331 <context>main</context> |
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332 |
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333 <para> |
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334 nginx uses the locking mechanism to implement <link id="accept_mutex"/> |
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335 and serialize access to shared memory. |
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336 On most systems the locks are implemented using atomic operations, |
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337 and this directive is ignored. |
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338 On other systems the “lock file” mechanism is used. |
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339 This directive specifies a prefix for the names of lock files. |
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340 </para> |
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341 |
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342 </directive> |
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343 |
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344 |
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345 <directive name="master_process"> |
271 | 346 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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347 <default>on</default> |
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348 <context>main</context> |
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349 |
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350 <para> |
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351 Determines whether worker processes are started. |
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352 This directive is intended for nginx developers. |
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353 </para> |
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354 |
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355 </directive> |
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356 |
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357 |
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358 <directive name="multi_accept"> |
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359 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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360 <default>off</default> |
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361 <context>events</context> |
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362 |
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363 <para> |
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364 If <literal>multi_accept</literal> is disabled, a worker process |
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365 will accept one new connection at a time. |
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366 Otherwise, a worker process |
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367 will accept all new connections at a time. |
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368 <note> |
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369 The directive is ignored if <link doc="events.xml" id="kqueue"/> |
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370 connection processing method is used, because it reports |
571
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371 the number of new connections waiting to be accepted. |
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372 </note> |
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373 </para> |
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374 |
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375 </directive> |
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376 |
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377 |
289
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378 <directive name="pcre_jit"> |
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379 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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380 <default>off</default> |
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381 <context>main</context> |
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382 <appeared-in>1.1.12</appeared-in> |
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383 |
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384 <para> |
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385 Enables or disables the use of “just-in-time compilation” (PCRE JIT) |
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386 for the regular expressions known by the time of configuration parsing. |
289
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387 </para> |
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388 |
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389 <para> |
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390 PCRE JIT can speed up processing of regular expressions significantly. |
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391 <note> |
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392 The JIT is available in PCRE libraries starting from version 8.20 |
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393 built with the <literal>--enable-jit</literal> configuration parameter. |
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394 When the PCRE library is built with nginx (<literal>--with-pcre=</literal>), |
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395 the JIT support is enabled via the |
289
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396 <literal>--with-pcre-jit</literal> configuration parameter. |
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397 </note> |
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398 </para> |
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399 |
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400 </directive> |
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401 |
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402 |
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403 <directive name="pid"> |
271 | 404 <syntax><value>file</value></syntax> |
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405 <default>nginx.pid</default> |
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406 <context>main</context> |
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407 |
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408 <para> |
271 | 409 Defines a <value>file</value> that will store the process ID of the main process. |
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410 </para> |
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411 |
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412 </directive> |
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413 |
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414 |
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415 <directive name="ssl_engine"> |
271 | 416 <syntax><value>device</value></syntax> |
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417 <default/> |
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418 <context>main</context> |
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419 |
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420 <para> |
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421 Defines the name of the hardware SSL accelerator. |
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422 </para> |
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423 |
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424 </directive> |
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425 |
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426 |
1436 | 427 <directive name="thread_pool"> |
428 <syntax> | |
429 <value>name</value> | |
430 <literal>threads</literal>=<value>number</value> | |
431 [<literal>max_queue</literal>=<value>number</value>]</syntax> | |
432 <default>default threads=32 max_queue=65536</default> | |
433 <context>main</context> | |
434 <appeared-in>1.7.11</appeared-in> | |
435 | |
436 <para> | |
437 Defines named thread pools | |
438 used for multi-threaded reading and sending of files | |
439 <link doc="http/ngx_http_core_module.xml" id="aio">without blocking</link> | |
440 worker processes. | |
441 </para> | |
442 | |
443 <para> | |
444 The <literal>threads</literal> parameter | |
445 defines the number of threads in the pool. | |
446 </para> | |
447 | |
448 <para> | |
449 In the event that all threads in the pool are busy, | |
450 a new task will wait in the queue. | |
451 The <literal>max_queue</literal> parameter limits the number | |
452 of tasks allowed to be waiting in the queue. | |
453 By default, up to 65536 tasks can wait in the queue. | |
454 When the queue overflows, the task is completed with an error. | |
455 </para> | |
456 | |
457 </directive> | |
458 | |
459 | |
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460 <directive name="timer_resolution"> |
271 | 461 <syntax><value>interval</value></syntax> |
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462 <default/> |
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463 <context>main</context> |
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464 |
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465 <para> |
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466 Reduces timer resolution in worker processes, thus reducing the |
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467 number of <c-func>gettimeofday</c-func> system calls made. |
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468 By default, <c-func>gettimeofday</c-func> is called each time |
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469 a kernel event is received. |
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470 With reduced resolution, <c-func>gettimeofday</c-func> is only |
271 | 471 called once per specified <value>interval</value>. |
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472 </para> |
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473 |
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474 <para> |
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475 Example: |
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476 <example> |
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477 timer_resolution 100ms; |
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478 </example> |
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479 </para> |
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480 |
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481 <para> |
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482 Internal implementation of the interval depends on the method used: |
63
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483 <list type="bullet"> |
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484 |
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485 <listitem> |
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486 the <c-def>EVFILT_TIMER</c-def> filter if <literal>kqueue</literal> is used; |
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487 </listitem> |
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488 |
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489 <listitem> |
271 | 490 <c-func>timer_create</c-func> if <literal>eventport</literal> is used; |
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491 </listitem> |
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492 |
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493 <listitem> |
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494 <c-func>setitimer</c-func> otherwise. |
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495 </listitem> |
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496 |
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497 </list> |
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498 </para> |
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499 |
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500 </directive> |
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501 |
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502 |
556
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503 <directive name="use"> |
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504 <syntax><value>method</value></syntax> |
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505 <default/> |
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506 <context>events</context> |
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507 |
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508 <para> |
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509 Specifies the <link doc="events.xml">connection processing</link> |
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510 <value>method</value> to use. |
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511 There is normally no need to specify it explicitly, because nginx will |
556
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512 by default use the most efficient method. |
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513 </para> |
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514 |
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515 </directive> |
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516 |
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517 |
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518 <directive name="user"> |
271 | 519 <syntax><value>user</value> [<value>group</value>]</syntax> |
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520 <default>nobody nobody</default> |
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521 <context>main</context> |
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522 |
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523 <para> |
271 | 524 Defines <value>user</value> and <value>group</value> |
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525 credentials used by worker processes. |
271 | 526 If <value>group</value> is omitted, a group whose name equals |
527 that of <value>user</value> is used. | |
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528 </para> |
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529 |
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530 </directive> |
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531 |
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532 |
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533 <directive name="worker_aio_requests"> |
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534 <syntax><value>number</value></syntax> |
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535 <default>32</default> |
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536 <context>events</context> |
750
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537 <appeared-in>1.1.4</appeared-in> |
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538 <appeared-in>1.0.7</appeared-in> |
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539 |
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540 <para> |
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541 When using <link doc="http/ngx_http_core_module.xml" id="aio"/> |
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542 with the <link doc="../docs/events.xml" id="epoll"/> |
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543 connection processing method, sets the maximum <value>number</value> of |
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544 outstanding asynchronous I/O operations |
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545 for a single worker process. |
2abb92a19101
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|
546 </para> |
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diff
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|
547 |
2abb92a19101
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diff
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|
548 </directive> |
2abb92a19101
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|
549 |
2abb92a19101
Documented 'worker_aio_requests' directive.
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|
550 |
545
e97b46d1842d
Documented the "worker_connections" directive.
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diff
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|
551 <directive name="worker_connections"> |
e97b46d1842d
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diff
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|
552 <syntax><value>number</value></syntax> |
e97b46d1842d
Documented the "worker_connections" directive.
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diff
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|
553 <default>512</default> |
e97b46d1842d
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diff
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|
554 <context>events</context> |
e97b46d1842d
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diff
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|
555 |
e97b46d1842d
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diff
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|
556 <para> |
e97b46d1842d
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diff
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|
557 Sets the maximum number of simultaneous connections that |
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diff
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|
558 can be opened by a worker process. |
e97b46d1842d
Documented the "worker_connections" directive.
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diff
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|
559 </para> |
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diff
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|
560 |
e97b46d1842d
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|
561 <para> |
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|
562 It should be kept in mind that this number includes all connections |
957
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|
563 (e.g. connections with proxied servers, among others), |
545
e97b46d1842d
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diff
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|
564 not only connections with clients. |
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diff
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|
565 Another consideration is that the actual number of simultaneous |
966 | 566 connections cannot exceed the current limit on |
957
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parents:
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|
567 the maximum number of open files, which can be changed by |
545
e97b46d1842d
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parents:
523
diff
changeset
|
568 <link id="worker_rlimit_nofile"/>. |
e97b46d1842d
Documented the "worker_connections" directive.
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523
diff
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|
569 </para> |
e97b46d1842d
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parents:
523
diff
changeset
|
570 |
e97b46d1842d
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parents:
523
diff
changeset
|
571 </directive> |
e97b46d1842d
Documented the "worker_connections" directive.
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diff
changeset
|
572 |
e97b46d1842d
Documented the "worker_connections" directive.
Ruslan Ermilov <ru@nginx.com>
parents:
523
diff
changeset
|
573 |
469
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
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|
574 <directive name="worker_cpu_affinity"> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
575 <syntax><value>cpumask</value> ...</syntax> |
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576 <syntax><literal>auto</literal> [<value>cpumask</value>]</syntax> |
469
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|
577 <default/> |
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578 <context>main</context> |
8275e169f77b
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|
579 |
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|
580 <para> |
8275e169f77b
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|
581 Binds worker processes to the sets of CPUs. |
957
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parents:
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|
582 Each CPU set is represented by a bitmask of allowed CPUs. |
469
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
583 There should be a separate set defined for each of the worker processes. |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
584 By default, worker processes are not bound to any specific CPUs. |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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|
585 </para> |
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Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
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|
586 |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
587 <para> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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|
588 For example, |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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diff
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|
589 <example> |
8275e169f77b
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parents:
455
diff
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|
590 worker_processes 4; |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
591 worker_cpu_affinity 0001 0010 0100 1000; |
8275e169f77b
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parents:
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diff
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|
592 </example> |
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|
593 binds each worker process to a separate CPU, while |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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diff
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|
594 <example> |
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Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
595 worker_processes 2; |
8275e169f77b
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diff
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|
596 worker_cpu_affinity 0101 1010; |
8275e169f77b
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parents:
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diff
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|
597 </example> |
8275e169f77b
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|
598 binds the first worker process to CPU0/CPU2, |
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Documented the "worker_cpu_affinity" directive.
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diff
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|
599 and the second worker process to CPU1/CPU3. |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
600 The second example is suitable for hyper-threading. |
8275e169f77b
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parents:
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diff
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|
601 </para> |
8275e169f77b
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parents:
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diff
changeset
|
602 |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
603 <para> |
1641
c0d1026e7e7b
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parents:
1480
diff
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|
604 The special value <literal>auto</literal> (1.9.10) allows |
c0d1026e7e7b
Documented the "auto" parameter in worker_cpu_affinity.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1480
diff
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|
605 binding worker processes automatically to available CPUs: |
c0d1026e7e7b
Documented the "auto" parameter in worker_cpu_affinity.
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parents:
1480
diff
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|
606 <example> |
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1480
diff
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|
607 worker_processes auto; |
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Documented the "auto" parameter in worker_cpu_affinity.
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|
608 worker_cpu_affinity auto; |
c0d1026e7e7b
Documented the "auto" parameter in worker_cpu_affinity.
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|
609 </example> |
c0d1026e7e7b
Documented the "auto" parameter in worker_cpu_affinity.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
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diff
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|
610 The optional mask parameter can be used to limit the CPUs |
c0d1026e7e7b
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parents:
1480
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|
611 available for automatic binding: |
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|
612 <example> |
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Documented the "auto" parameter in worker_cpu_affinity.
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|
613 worker_cpu_affinity auto 01010101; |
c0d1026e7e7b
Documented the "auto" parameter in worker_cpu_affinity.
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parents:
1480
diff
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|
614 </example> |
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Documented the "auto" parameter in worker_cpu_affinity.
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parents:
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diff
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|
615 </para> |
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Documented the "auto" parameter in worker_cpu_affinity.
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|
616 |
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Documented the "auto" parameter in worker_cpu_affinity.
Yaroslav Zhuravlev <yar@nginx.com>
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|
617 <para> |
469
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
changeset
|
618 <note> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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changeset
|
619 The directive is only available on FreeBSD and Linux. |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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455
diff
changeset
|
620 </note> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
621 </para> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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diff
changeset
|
622 |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
623 </directive> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
624 |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
625 |
63
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
626 <directive name="worker_priority"> |
271 | 627 <syntax><value>number</value></syntax> |
102
c76a257f3fd4
The directive name is now automatically printed in <default> and <syntax>.
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diff
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|
628 <default>0</default> |
63
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parents:
diff
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|
629 <context>main</context> |
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parents:
diff
changeset
|
630 |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
631 <para> |
957
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Text review of the ngx_core_module.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
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diff
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|
632 Defines the scheduling priority for worker processes like it is |
63
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
633 done by the <command>nice</command> command: a negative |
271 | 634 <value>number</value> |
63
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
635 means higher priority. |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
636 Allowed range normally varies from -20 to 20. |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
637 </para> |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
638 |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
639 <para> |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
640 Example: |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
641 <example> |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
642 worker_priority -10; |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
643 </example> |
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Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
644 </para> |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
645 |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
646 </directive> |
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Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
647 |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
648 |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
649 <directive name="worker_processes"> |
740
46d70031bea9
Documented the recently added "auto" parameter of the
Andrey Belov <defan@nginx.com>
parents:
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diff
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|
650 <syntax><value>number</value> | <literal>auto</literal></syntax> |
102
c76a257f3fd4
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diff
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|
651 <default>1</default> |
63
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parents:
diff
changeset
|
652 <context>main</context> |
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Initial English translation of ngx_core_module.
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diff
changeset
|
653 |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
654 <para> |
6108fd3217e7
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Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
655 Defines the number of worker processes. |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
656 </para> |
6108fd3217e7
Initial English translation of ngx_core_module.
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diff
changeset
|
657 |
226
c4b33b07dcfe
Added some basic hints on how to tune "worker_processes".
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158
diff
changeset
|
658 <para> |
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Added some basic hints on how to tune "worker_processes".
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diff
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|
659 The optimal value depends on many factors including (but not |
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Added some basic hints on how to tune "worker_processes".
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|
660 limited to) the number of CPU cores, the number of hard disk |
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|
661 drives that store data, and load pattern. |
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|
662 When one is in doubt, setting it to the number of available CPU cores |
740
46d70031bea9
Documented the recently added "auto" parameter of the
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parents:
659
diff
changeset
|
663 would be a good start (the value “<literal>auto</literal>” |
46d70031bea9
Documented the recently added "auto" parameter of the
Andrey Belov <defan@nginx.com>
parents:
659
diff
changeset
|
664 will try to autodetect it). |
742
3a2e35f4c279
Documented that "worker_processes auto" appeared in version 1.3.8.
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740
diff
changeset
|
665 <note> |
3a2e35f4c279
Documented that "worker_processes auto" appeared in version 1.3.8.
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740
diff
changeset
|
666 The <literal>auto</literal> parameter is supported starting from |
764
f8434fdd3cd9
The "auto" parameter of the ""worker_processes" directive
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750
diff
changeset
|
667 versions 1.3.8 and 1.2.5. |
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668 </note> |
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669 </para> |
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670 |
63
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671 </directive> |
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672 |
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673 |
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674 <directive name="worker_rlimit_core"> |
271 | 675 <syntax><value>size</value></syntax> |
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676 <default/> |
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677 <context>main</context> |
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678 |
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679 <para> |
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680 Changes the limit on the largest size of a core file |
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681 (<c-def>RLIMIT_CORE</c-def>) for worker processes. |
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682 Used to increase the limit without restarting the main process. |
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683 </para> |
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684 |
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685 </directive> |
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686 |
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687 |
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688 <directive name="worker_rlimit_nofile"> |
271 | 689 <syntax><value>number</value></syntax> |
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690 <default/> |
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691 <context>main</context> |
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692 |
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693 <para> |
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694 Changes the limit on the maximum number of open files |
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695 (<c-def>RLIMIT_NOFILE</c-def>) for worker processes. |
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696 Used to increase the limit without restarting the main process. |
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697 </para> |
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698 |
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699 </directive> |
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700 |
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701 |
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702 <directive name="working_directory"> |
271 | 703 <syntax><value>directory</value></syntax> |
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704 <default/> |
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705 <context>main</context> |
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706 |
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707 <para> |
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708 Defines the current working directory for a worker process. |
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709 It is primarily used when writing a core-file, in which case |
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710 a worker process should have write permission for the |
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711 specified directory. |
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712 </para> |
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713 |
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714 </directive> |
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715 |
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716 </section> |
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717 |
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718 </module> |