Mercurial > hg > nginx-site
annotate xml/en/docs/ngx_core_module.xml @ 469:8275e169f77b
Documented the "worker_cpu_affinity" directive.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Wed, 28 Mar 2012 13:34:19 +0000 |
parents | 571b790ddf9e |
children | 8e1356bd281a |
rev | line source |
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1 <?xml version="1.0"?> |
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2 |
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3 <!DOCTYPE module SYSTEM "../../../dtd/module.dtd"> |
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4 |
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5 <module name="Core functionality" |
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6 link="/en/docs/ngx_core_module.html" |
98 | 7 lang="en"> |
63
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8 |
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9 <section id="example" name="Example Configuration"> |
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10 |
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11 <para> |
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12 <example> |
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13 user www www; |
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14 worker_processes 2; |
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15 |
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16 error_log /var/log/nginx-error.log info; |
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17 |
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18 events { |
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19 use kqueue; |
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20 worker_connections 2048; |
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21 } |
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22 |
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23 ... |
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24 </example> |
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25 </para> |
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26 |
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27 </section> |
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28 |
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29 |
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30 <section id="directives" name="Directives"> |
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31 |
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32 <directive name="daemon"> |
271 | 33 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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34 <default>on</default> |
63
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35 <context>main</context> |
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36 |
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37 <para> |
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38 Determines whether nginx should become a daemon. |
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39 Mainly used during development. |
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40 </para> |
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41 |
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42 </directive> |
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43 |
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44 |
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45 <directive name="error_log"> |
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46 <syntax> |
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47 <value>file</value> | <literal>stderr</literal> |
271 | 48 [<literal>debug</literal> | |
49 <literal>info</literal> | | |
50 <literal>notice</literal> | | |
51 <literal>warn</literal> | | |
52 <literal>error</literal> | | |
53 <literal>crit</literal> | | |
54 <literal>alert</literal> | | |
55 <literal>emerg</literal>]</syntax> | |
158
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56 <default>logs/error.log error</default> |
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57 <context>main</context> |
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58 <context>http</context> |
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59 <context>server</context> |
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60 <context>location</context> |
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61 |
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62 <para> |
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63 Configures logging. |
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64 </para> |
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65 |
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66 <para> |
271 | 67 The first parameter defines a file that will store the log. |
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68 <!-- |
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69 If filename is not absolute, it is prefixed with the prefix path. |
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70 --> |
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71 The special value <literal>stderr</literal> selects the standard error file. |
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72 </para> |
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73 |
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74 <para> |
271 | 75 The second parameter determines the level of logging. |
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76 Log levels above are listed in the order of increasing severity. |
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77 Setting a certain log level will cause all messages of |
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78 the specified and more severe log levels to be logged. |
271 | 79 For example, the default level <literal>error</literal> will |
80 cause <literal>error</literal>, <literal>crit</literal>, | |
81 <literal>alert</literal>, and <literal>emerg</literal> messages | |
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82 to be logged. |
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83 If this parameter is omitted then <literal>error</literal> is used. |
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84 <note> |
271 | 85 For <literal>debug</literal> logging to work, nginx needs to |
86 be built with <literal>--with-debug</literal>. | |
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87 </note> |
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88 </para> |
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89 |
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90 </directive> |
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91 |
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92 |
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93 <directive name="env"> |
271 | 94 <syntax><value>variable</value>[=<value>value</value>]</syntax> |
102
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95 <default>TZ</default> |
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96 <context>main</context> |
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97 |
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98 <para> |
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99 Allows to limit a set of environment variables, change their values, |
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100 or create new environment variables, for the following cases: |
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101 <list type="bullet"> |
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102 |
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103 <listitem> |
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104 variable inheritance during a |
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105 <link doc="control.xml" id="upgrade">live upgrade</link> |
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106 of an executable file; |
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107 </listitem> |
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108 |
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109 <listitem> |
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110 use of variables by the module |
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111 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>; |
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112 </listitem> |
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113 |
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114 <listitem> |
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115 use of variables by worker processes. |
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116 Please bear in mind that controlling system libraries in this way |
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117 is not always possible as it is not uncommon for libraries to check |
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118 variables only during initialization, well before they can be set |
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119 using this directive. |
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120 An exception from this is an above mentioned |
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121 <link doc="control.xml" id="upgrade">live upgrade</link> |
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122 of an executable file. |
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123 </listitem> |
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124 |
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125 </list> |
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126 </para> |
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127 |
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128 <para> |
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129 The TZ variable is always inherited and made available to the module |
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130 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>, |
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131 unless configured explicitly. |
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132 </para> |
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133 |
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134 <para> |
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135 Usage example: |
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136 <example> |
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137 env MALLOC_OPTIONS; |
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138 env PERL5LIB=/data/site/modules; |
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139 env OPENSSL_ALLOW_PROXY_CERTS=1; |
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140 </example> |
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141 </para> |
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142 |
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143 <para> |
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144 <note> |
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145 The NGINX environment variable is used internally by nginx |
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146 and should not be set directly by the user. |
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147 </note> |
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148 </para> |
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149 |
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150 </directive> |
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151 |
249 | 152 |
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153 <directive name="include"> |
271 | 154 <syntax><value>file</value> | <value>mask</value></syntax> |
63
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155 <default/> |
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156 <context/> |
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157 |
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158 <para> |
271 | 159 Includes another <value>file</value>, or files matching the |
160 specified <value>mask</value>, into configuration. | |
63
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161 Included files should consist of |
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162 syntactically correct directives and blocks. |
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163 </para> |
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164 |
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165 <para> |
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166 Usage example: |
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167 <example> |
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168 include mime.types; |
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169 include vhosts/*.conf; |
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170 </example> |
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171 </para> |
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172 |
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173 </directive> |
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174 |
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175 |
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176 <directive name="master_process"> |
271 | 177 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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178 <default>on</default> |
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179 <context>main</context> |
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180 |
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181 <para> |
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182 Determines whether worker processes are started. |
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183 This directive is intended for nginx developers. |
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184 </para> |
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185 |
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186 </directive> |
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187 |
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188 |
289
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189 <directive name="pcre_jit"> |
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190 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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191 <default>off</default> |
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192 <context>main</context> |
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193 <appeared-in>1.1.12</appeared-in> |
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194 |
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195 <para> |
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196 Enables or disables the use of “just-in-time compilation” (PCRE JIT) |
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197 for regular expressions known at configuration parse time. |
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198 </para> |
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199 |
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200 <para> |
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201 PCRE JIT can speed up processing of regular expressions significantly. |
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202 <note> |
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203 The JIT is available in PCRE libraries starting from version 8.20 |
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204 built with the <literal>--enable-jit</literal> configuration parameter. |
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205 When building the PCRE library with nginx (<literal>--with-pcre=</literal>), |
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206 the JIT support should be enabled with the |
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207 <literal>--with-pcre-jit</literal> configuration parameter. |
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208 </note> |
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209 </para> |
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210 |
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211 </directive> |
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212 |
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213 |
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214 <directive name="pid"> |
271 | 215 <syntax><value>file</value></syntax> |
102
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216 <default>nginx.pid</default> |
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217 <context>main</context> |
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218 |
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219 <para> |
271 | 220 Defines a <value>file</value> that will store the process ID of the main process. |
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221 </para> |
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222 |
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223 </directive> |
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224 |
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225 |
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226 <directive name="ssl_engine"> |
271 | 227 <syntax><value>device</value></syntax> |
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228 <default/> |
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229 <context>main</context> |
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230 |
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231 <para> |
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232 Defines the name of the hardware SSL accelerator. |
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233 </para> |
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234 |
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235 </directive> |
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236 |
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237 |
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238 <directive name="timer_resolution"> |
271 | 239 <syntax><value>interval</value></syntax> |
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240 <default/> |
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241 <context>main</context> |
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242 |
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243 <para> |
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244 Reduces timer resolution in worker processes, thus reducing the |
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245 number of <c-func>gettimeofday</c-func> system calls made. |
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246 By default, <c-func>gettimeofday</c-func> is called each time |
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247 on receiving a kernel event. |
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248 With reduced resolution, <c-func>gettimeofday</c-func> is only |
271 | 249 called once per specified <value>interval</value>. |
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250 </para> |
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251 |
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252 <para> |
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253 Example: |
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254 <example> |
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255 timer_resolution 100ms; |
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256 </example> |
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257 </para> |
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258 |
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259 <para> |
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260 An internal implementation of interval depends on the method used: |
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261 <list type="bullet"> |
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262 |
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263 <listitem> |
271 | 264 an <c-def>EVFILT_TIMER</c-def> filter if <literal>kqueue</literal> is used; |
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265 </listitem> |
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266 |
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267 <listitem> |
271 | 268 <c-func>timer_create</c-func> if <literal>eventport</literal> is used; |
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269 </listitem> |
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270 |
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271 <listitem> |
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272 <c-func>setitimer</c-func> otherwise. |
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273 </listitem> |
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274 |
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275 </list> |
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276 </para> |
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277 |
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278 </directive> |
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279 |
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280 |
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281 <directive name="user"> |
271 | 282 <syntax><value>user</value> [<value>group</value>]</syntax> |
102
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283 <default>nobody nobody</default> |
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284 <context>main</context> |
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285 |
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286 <para> |
271 | 287 Defines <value>user</value> and <value>group</value> |
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288 credentials used by worker processes. |
271 | 289 If <value>group</value> is omitted, a group whose name equals |
290 that of <value>user</value> is used. | |
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291 </para> |
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292 |
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293 </directive> |
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294 |
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295 |
469
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296 <directive name="worker_cpu_affinity"> |
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297 <syntax><value>cpumask</value> ...</syntax> |
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298 <default/> |
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299 <context>main</context> |
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300 |
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301 <para> |
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302 Binds worker processes to the sets of CPUs. |
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303 Each CPU set is represented by a bitmask of allowed to use CPUs. |
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304 There should be a separate set defined for each of the worker processes. |
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305 By default, worker processes are not bound to any specific CPUs. |
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306 </para> |
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307 |
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308 <para> |
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309 For example, |
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310 <example> |
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311 worker_processes 4; |
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312 worker_cpu_affinity 0001 0010 0100 1000; |
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313 </example> |
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314 binds each worker process to a separate CPU, while |
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315 <example> |
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316 worker_processes 2; |
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317 worker_cpu_affinity 0101 1010; |
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318 </example> |
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319 binds the first worker process to CPU0/CPU2, |
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320 and the second worker process to CPU1/CPU3. |
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321 The second example is suitable for hyper-threading. |
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322 </para> |
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323 |
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324 <para> |
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325 <note> |
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326 The directive is only available on FreeBSD and Linux. |
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327 </note> |
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328 </para> |
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329 |
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330 </directive> |
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331 |
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332 |
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333 <directive name="worker_priority"> |
271 | 334 <syntax><value>number</value></syntax> |
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335 <default>0</default> |
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336 <context>main</context> |
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337 |
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338 <para> |
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339 Defines a scheduling priority for worker processes like is |
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340 done by the <command>nice</command> command: a negative |
271 | 341 <value>number</value> |
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342 means higher priority. |
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343 Allowed range normally varies from -20 to 20. |
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344 </para> |
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345 |
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346 <para> |
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347 Example: |
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348 <example> |
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349 worker_priority -10; |
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350 </example> |
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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="worker_processes"> |
271 | 357 <syntax><value>number</value></syntax> |
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358 <default>1</default> |
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359 <context>main</context> |
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360 |
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361 <para> |
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362 Defines the number of worker processes. |
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363 </para> |
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364 |
226
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365 <para> |
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366 The optimal value depends on many factors including (but not |
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367 limited to) the number of CPU cores, the number of hard disk |
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368 drives that store data, and load pattern. |
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369 When in doubt, setting it to the number of available CPU cores |
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370 would be a good start. |
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371 </para> |
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372 |
63
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373 </directive> |
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374 |
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375 |
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376 <directive name="worker_rlimit_core"> |
271 | 377 <syntax><value>size</value></syntax> |
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378 <default/> |
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379 <context>main</context> |
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380 |
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381 <para> |
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382 Changes the limit on the largest size of a core file |
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383 (<c-def>RLIMIT_CORE</c-def>) for worker processes. |
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384 Used to increase the limit without restarting the main process. |
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385 </para> |
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386 |
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387 </directive> |
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388 |
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389 |
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390 <directive name="worker_rlimit_nofile"> |
271 | 391 <syntax><value>number</value></syntax> |
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392 <default/> |
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393 <context>main</context> |
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394 |
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395 <para> |
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396 Changes the limit on the maximum number of open files |
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397 (<c-def>RLIMIT_NOFILE</c-def>) for worker processes. |
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398 Used to increase the limit without restarting the main process. |
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399 </para> |
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400 |
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401 </directive> |
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402 |
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403 |
63
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404 <directive name="working_directory"> |
271 | 405 <syntax><value>directory</value></syntax> |
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406 <default/> |
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407 <context>main</context> |
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408 |
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409 <para> |
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410 Defines a current working directory for a worker process. |
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411 It is primarily used when writing a core-file, in which case |
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412 a worker process should have write permission for the |
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Ruslan Ermilov <ru@nginx.com>
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413 specified directory. |
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414 </para> |
6108fd3217e7
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415 |
6108fd3217e7
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Ruslan Ermilov <ru@nginx.com>
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416 </directive> |
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417 |
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Ruslan Ermilov <ru@nginx.com>
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418 </section> |
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419 |
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420 </module> |