Mercurial > hg > nginx-site
annotate xml/en/docs/ngx_core_module.xml @ 1755:bde044a0bd90
Documented that accept_mutex is off by default.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 20 Jul 2016 15:09:42 +0300 |
parents | 147e3d0339e8 |
children | 68928f8d31d9 |
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1 <?xml version="1.0"?> |
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2 |
580
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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 |
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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="20"> |
63
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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 Prior to version 1.11.3, the default value was <literal>on</literal>. |
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51 </note> |
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52 </para> |
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53 |
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54 </directive> |
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55 |
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56 |
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57 <directive name="accept_mutex_delay"> |
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58 <syntax><value>time</value></syntax> |
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59 <default>500ms</default> |
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60 <context>events</context> |
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61 |
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62 <para> |
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63 If <link id="accept_mutex"/> is enabled, specifies the maximum time |
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64 during which a worker process will try to restart accepting new |
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65 connections if another worker process is currently accepting |
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66 new connections. |
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67 </para> |
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68 |
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69 </directive> |
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70 |
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71 |
63
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72 <directive name="daemon"> |
271 | 73 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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74 <default>on</default> |
63
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75 <context>main</context> |
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76 |
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77 <para> |
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78 Determines whether nginx should become a daemon. |
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79 Mainly used during development. |
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80 </para> |
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81 |
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82 </directive> |
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83 |
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84 |
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85 <directive name="debug_connection"> |
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86 <syntax> |
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87 <value>address</value> | |
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88 <value>CIDR</value> | |
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89 <literal>unix:</literal></syntax> |
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90 <default/> |
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91 <context>events</context> |
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92 |
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93 <para> |
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94 Enables debugging log for selected client connections. |
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95 Other connections will use logging level set by the |
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96 <link id="error_log"/> directive. |
523 | 97 Debugged connections are specified by IPv4 or IPv6 (1.3.0, 1.2.1) |
98 address or network. | |
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99 A connection may also be specified using a hostname. |
523 | 100 For connections using UNIX-domain sockets (1.3.0, 1.2.1), |
101 debugging log is enabled by the “<literal>unix:</literal>” parameter. | |
516
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102 <example> |
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103 events { |
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104 debug_connection 127.0.0.1; |
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105 debug_connection localhost; |
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106 debug_connection 192.0.2.0/24; |
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107 debug_connection ::1; |
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108 debug_connection 2001:0db8::/32; |
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109 debug_connection unix:; |
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110 ... |
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111 } |
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112 </example> |
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113 <note> |
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114 For this directive to work, nginx needs to |
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115 be built with <literal>--with-debug</literal>, |
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116 see “<link doc="debugging_log.xml"/>”. |
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117 </note> |
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118 </para> |
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119 |
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120 </directive> |
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121 |
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122 |
574 | 123 <directive name="debug_points"> |
124 <syntax><literal>abort</literal> | <literal>stop</literal></syntax> | |
125 <default/> | |
126 <context>main</context> | |
127 | |
128 <para> | |
129 This directive is used for debugging. | |
130 </para> | |
131 | |
132 <para> | |
133 When internal error is detected, e.g. the leak of sockets on | |
134 restart of working processes, enabling <literal>debug_points</literal> | |
135 leads to a core file creation (<literal>abort</literal>) | |
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136 or to stopping of a process (<literal>stop</literal>) for further |
574 | 137 analysis using a system debugger. |
138 </para> | |
139 | |
140 </directive> | |
141 | |
142 | |
158
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143 <directive name="error_log"> |
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144 <syntax><value>file</value> [<value>level</value>]</syntax> |
158
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145 <default>logs/error.log error</default> |
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146 <context>main</context> |
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147 <context>http</context> |
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148 <context>mail</context> |
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149 <context>stream</context> |
158
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150 <context>server</context> |
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151 <context>location</context> |
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152 |
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153 <para> |
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154 Configures logging. |
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155 Several logs can be specified on the same level (1.5.2). |
158
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156 </para> |
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157 |
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158 <para> |
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159 The first parameter defines a <value>file</value> that will store the log. |
158
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160 <!-- |
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161 If filename is not absolute, it is prefixed with the prefix path. |
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162 --> |
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163 The special value <literal>stderr</literal> selects the standard error file. |
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164 Logging to <link doc="syslog.xml">syslog</link> can be configured by specifying |
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165 the “<literal>syslog:</literal>” prefix. |
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166 Logging to a |
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167 <link doc="debugging_log.xml" id="memory">cyclic memory buffer</link> |
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168 can be configured by specifying the “<literal>memory:</literal>” prefix and |
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169 buffer <value>size</value>, and is generally used for debugging (1.7.11). |
158
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170 </para> |
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171 |
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172 <para> |
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173 The second parameter determines the <value>level</value> of logging, |
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174 and can be one of the following: |
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175 <literal>debug</literal>, <literal>info</literal>, <literal>notice</literal>, |
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176 <literal>warn</literal>, <literal>error</literal>, <literal>crit</literal>, |
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177 <literal>alert</literal>, or <literal>emerg</literal>. |
158
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178 Log levels above are listed in the order of increasing severity. |
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179 Setting a certain log level will cause all messages of |
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180 the specified and more severe log levels to be logged. |
271 | 181 For example, the default level <literal>error</literal> will |
182 cause <literal>error</literal>, <literal>crit</literal>, | |
183 <literal>alert</literal>, and <literal>emerg</literal> messages | |
158
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184 to be logged. |
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185 If this parameter is omitted then <literal>error</literal> is used. |
158
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186 <note> |
271 | 187 For <literal>debug</literal> logging to work, nginx needs to |
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188 be built with <literal>--with-debug</literal>, |
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189 see “<link doc="debugging_log.xml"/>”. |
158
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190 </note> |
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191 |
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192 <note> |
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193 The directive can be specified on the |
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194 <literal>stream</literal> level |
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195 starting from version 1.7.11. |
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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>mail</literal> level |
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201 starting from version 1.9.0. |
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202 </note> |
158
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203 </para> |
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204 |
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205 </directive> |
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206 |
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207 |
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208 <directive name="env"> |
271 | 209 <syntax><value>variable</value>[=<value>value</value>]</syntax> |
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210 <default>TZ</default> |
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211 <context>main</context> |
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212 |
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213 <para> |
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214 By default, nginx removes all environment variables inherited |
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215 from its parent process except the TZ variable. |
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216 This directive allows preserving some of the inherited variables, |
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217 changing their values, or creating new environment variables. |
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218 These variables are then: |
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219 <list type="bullet"> |
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220 |
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221 <listitem> |
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222 inherited during a <link doc="control.xml" id="upgrade">live upgrade</link> |
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223 of an executable file; |
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224 </listitem> |
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225 |
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226 <listitem> |
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227 used by the |
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228 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link> module; |
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229 </listitem> |
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230 |
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231 <listitem> |
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232 used by worker processes. |
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233 One should bear in mind that controlling system libraries in this way |
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234 is not always possible as it is common for libraries to check |
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235 variables only during initialization, well before they can be set |
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236 using this directive. |
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237 An exception from this is an above mentioned |
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238 <link doc="control.xml" id="upgrade">live upgrade</link> |
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239 of an executable file. |
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240 </listitem> |
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241 |
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242 </list> |
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243 </para> |
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244 |
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245 <para> |
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246 The TZ variable is always inherited and available to the |
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247 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link> |
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248 module, unless it is configured explicitly. |
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249 </para> |
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250 |
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251 <para> |
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252 Usage example: |
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253 <example> |
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254 env MALLOC_OPTIONS; |
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255 env PERL5LIB=/data/site/modules; |
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256 env OPENSSL_ALLOW_PROXY_CERTS=1; |
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257 </example> |
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258 </para> |
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259 |
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260 <para> |
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261 <note> |
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262 The NGINX environment variable is used internally by nginx |
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263 and should not be set directly by the user. |
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264 </note> |
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265 </para> |
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266 |
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267 </directive> |
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268 |
249 | 269 |
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270 <directive name="events"> |
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271 <syntax block="yes"/> |
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272 <default/> |
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273 <context>main</context> |
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274 |
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275 <para> |
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276 Provides the configuration file context in which the directives that |
556
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277 affect connection processing are specified. |
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278 </para> |
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279 |
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280 </directive> |
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281 |
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282 |
63
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283 <directive name="include"> |
271 | 284 <syntax><value>file</value> | <value>mask</value></syntax> |
63
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285 <default/> |
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286 <context/> |
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287 |
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288 <para> |
271 | 289 Includes another <value>file</value>, or files matching the |
290 specified <value>mask</value>, into configuration. | |
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291 Included files should consist of |
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292 syntactically correct directives and blocks. |
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293 </para> |
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294 |
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295 <para> |
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296 Usage example: |
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297 <example> |
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298 include mime.types; |
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299 include vhosts/*.conf; |
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300 </example> |
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301 </para> |
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302 |
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303 </directive> |
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304 |
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305 |
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306 <directive name="load_module"> |
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307 <syntax><value>file</value></syntax> |
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308 <default/> |
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309 <context>main</context> |
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310 <appeared-in>1.9.11</appeared-in> |
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311 |
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312 <para> |
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313 Loads a dynamic module. |
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314 </para> |
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315 |
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316 <para> |
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317 Example: |
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318 <example> |
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319 load_module modules/ngx_mail_module.so; |
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320 </example> |
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321 </para> |
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322 |
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323 </directive> |
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324 |
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325 |
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326 <directive name="lock_file"> |
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327 <syntax><value>file</value></syntax> |
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328 <default>logs/nginx.lock</default> |
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329 <context>main</context> |
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330 |
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331 <para> |
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332 nginx uses the locking mechanism to implement <link id="accept_mutex"/> |
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333 and serialize access to shared memory. |
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334 On most systems the locks are implemented using atomic operations, |
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335 and this directive is ignored. |
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336 On other systems the “lock file” mechanism is used. |
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337 This directive specifies a prefix for the names of lock files. |
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338 </para> |
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339 |
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340 </directive> |
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341 |
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342 |
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343 <directive name="master_process"> |
271 | 344 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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345 <default>on</default> |
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346 <context>main</context> |
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347 |
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348 <para> |
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349 Determines whether worker processes are started. |
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350 This directive is intended for nginx developers. |
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351 </para> |
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352 |
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353 </directive> |
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354 |
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355 |
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356 <directive name="multi_accept"> |
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357 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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358 <default>off</default> |
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359 <context>events</context> |
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360 |
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361 <para> |
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362 If <literal>multi_accept</literal> is disabled, a worker process |
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363 will accept one new connection at a time. |
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364 Otherwise, a worker process |
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365 will accept all new connections at a time. |
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366 <note> |
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367 The directive is ignored if <link doc="events.xml" id="kqueue"/> |
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368 connection processing method is used, because it reports |
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369 the number of new connections waiting to be accepted. |
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370 </note> |
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371 </para> |
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372 |
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373 </directive> |
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374 |
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375 |
289
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376 <directive name="pcre_jit"> |
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377 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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378 <default>off</default> |
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379 <context>main</context> |
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380 <appeared-in>1.1.12</appeared-in> |
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381 |
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382 <para> |
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383 Enables or disables the use of “just-in-time compilation” (PCRE JIT) |
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384 for the regular expressions known by the time of configuration parsing. |
289
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385 </para> |
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386 |
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387 <para> |
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388 PCRE JIT can speed up processing of regular expressions significantly. |
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389 <note> |
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390 The JIT is available in PCRE libraries starting from version 8.20 |
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391 built with the <literal>--enable-jit</literal> configuration parameter. |
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392 When the PCRE library is built with nginx (<literal>--with-pcre=</literal>), |
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393 the JIT support is enabled via the |
289
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394 <literal>--with-pcre-jit</literal> configuration parameter. |
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395 </note> |
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396 </para> |
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397 |
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398 </directive> |
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399 |
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400 |
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401 <directive name="pid"> |
271 | 402 <syntax><value>file</value></syntax> |
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403 <default>nginx.pid</default> |
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404 <context>main</context> |
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405 |
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406 <para> |
271 | 407 Defines a <value>file</value> that will store the process ID of the main process. |
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408 </para> |
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409 |
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410 </directive> |
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411 |
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412 |
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413 <directive name="ssl_engine"> |
271 | 414 <syntax><value>device</value></syntax> |
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415 <default/> |
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416 <context>main</context> |
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417 |
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418 <para> |
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419 Defines the name of the hardware SSL accelerator. |
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420 </para> |
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421 |
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422 </directive> |
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423 |
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424 |
1436 | 425 <directive name="thread_pool"> |
426 <syntax> | |
427 <value>name</value> | |
428 <literal>threads</literal>=<value>number</value> | |
429 [<literal>max_queue</literal>=<value>number</value>]</syntax> | |
430 <default>default threads=32 max_queue=65536</default> | |
431 <context>main</context> | |
432 <appeared-in>1.7.11</appeared-in> | |
433 | |
434 <para> | |
435 Defines named thread pools | |
436 used for multi-threaded reading and sending of files | |
437 <link doc="http/ngx_http_core_module.xml" id="aio">without blocking</link> | |
438 worker processes. | |
439 </para> | |
440 | |
441 <para> | |
442 The <literal>threads</literal> parameter | |
443 defines the number of threads in the pool. | |
444 </para> | |
445 | |
446 <para> | |
447 In the event that all threads in the pool are busy, | |
448 a new task will wait in the queue. | |
449 The <literal>max_queue</literal> parameter limits the number | |
450 of tasks allowed to be waiting in the queue. | |
451 By default, up to 65536 tasks can wait in the queue. | |
452 When the queue overflows, the task is completed with an error. | |
453 </para> | |
454 | |
455 </directive> | |
456 | |
457 | |
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458 <directive name="timer_resolution"> |
271 | 459 <syntax><value>interval</value></syntax> |
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460 <default/> |
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461 <context>main</context> |
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462 |
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463 <para> |
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464 Reduces timer resolution in worker processes, thus reducing the |
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465 number of <c-func>gettimeofday</c-func> system calls made. |
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466 By default, <c-func>gettimeofday</c-func> is called each time |
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467 a kernel event is received. |
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468 With reduced resolution, <c-func>gettimeofday</c-func> is only |
271 | 469 called once per specified <value>interval</value>. |
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470 </para> |
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471 |
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472 <para> |
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473 Example: |
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474 <example> |
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475 timer_resolution 100ms; |
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476 </example> |
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477 </para> |
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478 |
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479 <para> |
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480 Internal implementation of the interval depends on the method used: |
63
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481 <list type="bullet"> |
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482 |
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483 <listitem> |
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484 the <c-def>EVFILT_TIMER</c-def> filter if <literal>kqueue</literal> is used; |
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485 </listitem> |
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486 |
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487 <listitem> |
271 | 488 <c-func>timer_create</c-func> if <literal>eventport</literal> is used; |
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489 </listitem> |
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490 |
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491 <listitem> |
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492 <c-func>setitimer</c-func> otherwise. |
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493 </listitem> |
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494 |
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495 </list> |
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496 </para> |
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497 |
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498 </directive> |
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499 |
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500 |
556
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501 <directive name="use"> |
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502 <syntax><value>method</value></syntax> |
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503 <default/> |
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504 <context>events</context> |
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505 |
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506 <para> |
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507 Specifies the <link doc="events.xml">connection processing</link> |
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508 <value>method</value> to use. |
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509 There is normally no need to specify it explicitly, because nginx will |
556
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510 by default use the most efficient method. |
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511 </para> |
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512 |
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513 </directive> |
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514 |
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515 |
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516 <directive name="user"> |
271 | 517 <syntax><value>user</value> [<value>group</value>]</syntax> |
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518 <default>nobody nobody</default> |
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519 <context>main</context> |
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520 |
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521 <para> |
271 | 522 Defines <value>user</value> and <value>group</value> |
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523 credentials used by worker processes. |
271 | 524 If <value>group</value> is omitted, a group whose name equals |
525 that of <value>user</value> is used. | |
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526 </para> |
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527 |
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528 </directive> |
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529 |
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530 |
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531 <directive name="worker_aio_requests"> |
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532 <syntax><value>number</value></syntax> |
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533 <default>32</default> |
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534 <context>events</context> |
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535 <appeared-in>1.1.4</appeared-in> |
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536 <appeared-in>1.0.7</appeared-in> |
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537 |
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538 <para> |
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539 When using <link doc="http/ngx_http_core_module.xml" id="aio"/> |
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540 with the <link doc="../docs/events.xml" id="epoll"/> |
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541 connection processing method, sets the maximum <value>number</value> of |
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542 outstanding asynchronous I/O operations |
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543 for a single worker process. |
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544 </para> |
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545 |
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546 </directive> |
2abb92a19101
Documented 'worker_aio_requests' directive.
Vladimir Homutov <vl@nginx.com>
parents:
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diff
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|
547 |
2abb92a19101
Documented 'worker_aio_requests' directive.
Vladimir Homutov <vl@nginx.com>
parents:
742
diff
changeset
|
548 |
545
e97b46d1842d
Documented the "worker_connections" directive.
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diff
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|
549 <directive name="worker_connections"> |
e97b46d1842d
Documented the "worker_connections" directive.
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diff
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|
550 <syntax><value>number</value></syntax> |
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|
551 <default>512</default> |
e97b46d1842d
Documented the "worker_connections" directive.
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diff
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|
552 <context>events</context> |
e97b46d1842d
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parents:
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diff
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|
553 |
e97b46d1842d
Documented the "worker_connections" directive.
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diff
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|
554 <para> |
e97b46d1842d
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parents:
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diff
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|
555 Sets the maximum number of simultaneous connections that |
e97b46d1842d
Documented the "worker_connections" directive.
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diff
changeset
|
556 can be opened by a worker process. |
e97b46d1842d
Documented the "worker_connections" directive.
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diff
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|
557 </para> |
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|
558 |
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|
559 <para> |
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diff
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|
560 It should be kept in mind that this number includes all connections |
957
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|
561 (e.g. connections with proxied servers, among others), |
545
e97b46d1842d
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diff
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|
562 not only connections with clients. |
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|
563 Another consideration is that the actual number of simultaneous |
966 | 564 connections cannot exceed the current limit on |
957
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|
565 the maximum number of open files, which can be changed by |
545
e97b46d1842d
Documented the "worker_connections" directive.
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parents:
523
diff
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|
566 <link id="worker_rlimit_nofile"/>. |
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Documented the "worker_connections" directive.
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parents:
523
diff
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|
567 </para> |
e97b46d1842d
Documented the "worker_connections" directive.
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parents:
523
diff
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|
568 |
e97b46d1842d
Documented the "worker_connections" directive.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
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|
569 </directive> |
e97b46d1842d
Documented the "worker_connections" directive.
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diff
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|
570 |
e97b46d1842d
Documented the "worker_connections" directive.
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parents:
523
diff
changeset
|
571 |
469
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
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|
572 <directive name="worker_cpu_affinity"> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
573 <syntax><value>cpumask</value> ...</syntax> |
1641
c0d1026e7e7b
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Yaroslav Zhuravlev <yar@nginx.com>
parents:
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diff
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|
574 <syntax><literal>auto</literal> [<value>cpumask</value>]</syntax> |
469
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diff
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|
575 <default/> |
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|
576 <context>main</context> |
8275e169f77b
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diff
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|
577 |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
578 <para> |
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Documented the "worker_cpu_affinity" directive.
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diff
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|
579 Binds worker processes to the sets of CPUs. |
957
6d9d4bb571a9
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|
580 Each CPU set is represented by a bitmask of allowed CPUs. |
469
8275e169f77b
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|
581 There should be a separate set defined for each of the worker processes. |
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Documented the "worker_cpu_affinity" directive.
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|
582 By default, worker processes are not bound to any specific CPUs. |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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diff
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|
583 </para> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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diff
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|
584 |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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|
585 <para> |
8275e169f77b
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parents:
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diff
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|
586 For example, |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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diff
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|
587 <example> |
8275e169f77b
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parents:
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|
588 worker_processes 4; |
8275e169f77b
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455
diff
changeset
|
589 worker_cpu_affinity 0001 0010 0100 1000; |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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diff
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|
590 </example> |
8275e169f77b
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parents:
455
diff
changeset
|
591 binds each worker process to a separate CPU, while |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
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|
592 <example> |
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parents:
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diff
changeset
|
593 worker_processes 2; |
8275e169f77b
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diff
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|
594 worker_cpu_affinity 0101 1010; |
8275e169f77b
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parents:
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diff
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|
595 </example> |
8275e169f77b
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parents:
455
diff
changeset
|
596 binds the first worker process to CPU0/CPU2, |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
597 and the second worker process to CPU1/CPU3. |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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|
598 The second example is suitable for hyper-threading. |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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diff
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|
599 </para> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
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diff
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|
600 |
8275e169f77b
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diff
changeset
|
601 <para> |
1641
c0d1026e7e7b
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parents:
1480
diff
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|
602 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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|
603 binding worker processes automatically to available CPUs: |
c0d1026e7e7b
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parents:
1480
diff
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|
604 <example> |
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parents:
1480
diff
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|
605 worker_processes auto; |
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1480
diff
changeset
|
606 worker_cpu_affinity auto; |
c0d1026e7e7b
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parents:
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|
607 </example> |
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Documented the "auto" parameter in worker_cpu_affinity.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
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diff
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|
608 The optional mask parameter can be used to limit the CPUs |
c0d1026e7e7b
Documented the "auto" parameter in worker_cpu_affinity.
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parents:
1480
diff
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|
609 available for automatic binding: |
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parents:
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diff
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|
610 <example> |
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Documented the "auto" parameter in worker_cpu_affinity.
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|
611 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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|
612 </example> |
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Documented the "auto" parameter in worker_cpu_affinity.
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parents:
1480
diff
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|
613 </para> |
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Documented the "auto" parameter in worker_cpu_affinity.
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parents:
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diff
changeset
|
614 |
c0d1026e7e7b
Documented the "auto" parameter in worker_cpu_affinity.
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parents:
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diff
changeset
|
615 <para> |
469
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
616 <note> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
617 The directive is only available on FreeBSD and Linux. |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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diff
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|
618 </note> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
619 </para> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
620 |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
621 </directive> |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
622 |
8275e169f77b
Documented the "worker_cpu_affinity" directive.
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parents:
455
diff
changeset
|
623 |
63
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
624 <directive name="worker_priority"> |
271 | 625 <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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|
626 <default>0</default> |
63
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parents:
diff
changeset
|
627 <context>main</context> |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
628 |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
629 <para> |
957
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Text review of the ngx_core_module.
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parents:
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diff
changeset
|
630 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
|
631 done by the <command>nice</command> command: a negative |
271 | 632 <value>number</value> |
63
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
633 means higher priority. |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
634 Allowed range normally varies from -20 to 20. |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
635 </para> |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
636 |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
637 <para> |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
638 Example: |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
639 <example> |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
640 worker_priority -10; |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
641 </example> |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
642 </para> |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
643 |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
644 </directive> |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
645 |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
646 |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
647 <directive name="worker_processes"> |
740
46d70031bea9
Documented the recently added "auto" parameter of the
Andrey Belov <defan@nginx.com>
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|
648 <syntax><value>number</value> | <literal>auto</literal></syntax> |
102
c76a257f3fd4
The directive name is now automatically printed in <default> and <syntax>.
Ruslan Ermilov <ru@nginx.com>
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|
649 <default>1</default> |
63
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diff
changeset
|
650 <context>main</context> |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
651 |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
652 <para> |
6108fd3217e7
Initial English translation of ngx_core_module.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
653 Defines the number of worker processes. |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
654 </para> |
6108fd3217e7
Initial English translation of ngx_core_module.
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parents:
diff
changeset
|
655 |
226
c4b33b07dcfe
Added some basic hints on how to tune "worker_processes".
Ruslan Ermilov <ru@nginx.com>
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diff
changeset
|
656 <para> |
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Added some basic hints on how to tune "worker_processes".
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|
657 The optimal value depends on many factors including (but not |
c4b33b07dcfe
Added some basic hints on how to tune "worker_processes".
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diff
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|
658 limited to) the number of CPU cores, the number of hard disk |
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Added some basic hints on how to tune "worker_processes".
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changeset
|
659 drives that store data, and load pattern. |
957
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Text review of the ngx_core_module.
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parents:
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diff
changeset
|
660 When one is in doubt, setting it to the number of available CPU cores |
740
46d70031bea9
Documented the recently added "auto" parameter of the
Andrey Belov <defan@nginx.com>
parents:
659
diff
changeset
|
661 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
|
662 will try to autodetect it). |
742
3a2e35f4c279
Documented that "worker_processes auto" appeared in version 1.3.8.
Ruslan Ermilov <ru@nginx.com>
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740
diff
changeset
|
663 <note> |
3a2e35f4c279
Documented that "worker_processes auto" appeared in version 1.3.8.
Ruslan Ermilov <ru@nginx.com>
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740
diff
changeset
|
664 The <literal>auto</literal> parameter is supported starting from |
764
f8434fdd3cd9
The "auto" parameter of the ""worker_processes" directive
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parents:
750
diff
changeset
|
665 versions 1.3.8 and 1.2.5. |
742
3a2e35f4c279
Documented that "worker_processes auto" appeared in version 1.3.8.
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diff
changeset
|
666 </note> |
226
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|
667 </para> |
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Added some basic hints on how to tune "worker_processes".
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diff
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|
668 |
63
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669 </directive> |
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670 |
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671 |
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672 <directive name="worker_rlimit_core"> |
271 | 673 <syntax><value>size</value></syntax> |
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674 <default/> |
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675 <context>main</context> |
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676 |
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677 <para> |
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678 Changes the limit on the largest size of a core file |
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679 (<c-def>RLIMIT_CORE</c-def>) for worker processes. |
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680 Used to increase the limit without restarting the main process. |
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681 </para> |
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682 |
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683 </directive> |
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684 |
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685 |
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686 <directive name="worker_rlimit_nofile"> |
271 | 687 <syntax><value>number</value></syntax> |
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688 <default/> |
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689 <context>main</context> |
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690 |
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691 <para> |
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692 Changes the limit on the maximum number of open files |
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693 (<c-def>RLIMIT_NOFILE</c-def>) for worker processes. |
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694 Used to increase the limit without restarting the main process. |
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695 </para> |
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696 |
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697 </directive> |
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698 |
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699 |
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700 <directive name="working_directory"> |
271 | 701 <syntax><value>directory</value></syntax> |
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702 <default/> |
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703 <context>main</context> |
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704 |
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705 <para> |
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706 Defines the current working directory for a worker process. |
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707 It is primarily used when writing a core-file, in which case |
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708 a worker process should have write permission for the |
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709 specified directory. |
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710 </para> |
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711 |
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712 </directive> |
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713 |
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714 </section> |
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715 |
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716 </module> |