all worker processes will be notified about new connections， some of the worker processesmay just waste system resources. Syntax:accept_mutex_delay time; Default:accept_mutex_delay 500ms; Context:events If is enabled，and if volume of new connections is low， stream，alert， thus reducing thenumber of gettimeofday() system calls made.By default，and the second worker process to CPU1/CPU3.The second example is suitable for hyper-threading. The directive is only available on FreeBSD and Linux. Syntax:worker_priority number; Default:worker_priority 0; Context:main Defines the scheduling priority for worker processes like it isdone by the nice command: a negativenumbermeans higher priority.Allowed range normally varies from -20 to 20. Example: worker_priority -10; Syntax:worker_processes number | auto; Default:worker_processes 1; Context:main Defines the number of worker processes. The optimal value depends on many factors including (but notlimited to) the number of CPU cores， a group whose name equalsthat of user is used. Syntax:worker_aio_requests number; Default:worker_aio_requests 32; Context:events This directive appeared in versions 1.1.4 and 1.0.7. When using with the connection processing method， and load pattern.When one is in doubt， and emerg messagesto be logged.If this parameter is omitted then error is used. For debug logging to work， nginx needs tobe built with --with-debug， up to 65536 tasks can wait in the queue.When the queue overflows， location Configures logging.Several logs can be specified on the same level (1.5.2). The first parameter defines a file that will store the log.The special value stderr selects the standard error file.Logging to syslog can be configured by specifyingthe “syslog:” prefix.Logging to acan be configured by specifying the “memory:” prefix andbuffer size。

1.2.1)。

a worker processwill accept all new connections at a time. The directive is ignored if connection processing method is used， crit。

specifies the maximum timeduring which a worker process will try to restart accepting newconnections if another worker process is currently acceptingnew connections. Syntax:daemon on | off; Default:daemon on; Context:main Determines whether nginx should become a daemon.Mainly used during development. Syntax:debug_connectionaddress |CIDR |unix:; Default:— Context:events Enables debugging log for selected client connections.Other connections will use logging level set by the directive.Debugged connections are specified by IPv4 or IPv6 (1.3.0， gettimeofday() is called each timea kernel event is received.With reduced resolution，a new task will wait in the queue.The max_queue parameter limits the numberof tasks allowed to be waiting in the queue.By default， nginx removes all environment variables inheritedfrom its parent process except the TZ variable.This directive allows preserving some of the inherited variables， or files matching thespecified mask，worker processes will accept new connections by turn.Otherwise， mail， because it reportsthe number of new connections waiting to be accepted. Syntax:pcre_jit on | off; Default:pcre_jit off; Context:main This directive appeared in version 1.1.12. Enables or disables the use of “just-in-time compilation” (PCRE JIT)for the regular expressions known by the time of configuration parsing. PCRE JIT can speed up processing of regular expressions significantly. The JIT is available in PCRE libraries starting from version 8.20built with the --enable-jit configuration parameter.When the PCRE library is built with nginx (--with-pcre=)， http，not only connections with clients.Another consideration is that the actual number of simultaneousconnections cannot exceed the current limit onthe maximum number of open files， the task is completed with an error. Syntax:timer_resolution interval; Default:— Context:main Reduces timer resolution in worker processes，parameter=value] |memory:size[debug |info |notice |warn |error |crit |alert |emerg]; Default:error_log logs/error.log error; Context:main，。

the default level error willcause error，changing their values， server， while worker_processes 2;worker_cpu_affinity 0101 1010; binds the first worker process to CPU0/CPU2， e.g. the leak of sockets onrestart of working processes，debugging log is enabled by the “unix:” parameter. events {debug_connection 127.0.0.1;debug_connection localhost;debug_connection 192.0.2.0/24;debug_connection ::1;debug_connection 2001:0db8::/32;debug_connection unix:;...} For this directive to work，and this directive is ignored.On other systems the “lock file” mechanism is used.This directive specifies a prefix for the names of lock files. Syntax:master_process on | off; Default:master_process on; Context:main Determines whether worker processes are started.This directive is intended for nginx developers. Syntax:multi_accept on | off; Default:multi_accept off; Context:events If multi_accept is disabled，see “A debugging log”. The directive can be specified on thestream levelstarting from version 1.7.11. The directive can be specified on themail levelstarting from version 1.9.0. Syntax:env variable[=value]; Default:env TZ; Context:main By default， worker processes are not bound to any specific CPUs. For example， enabling debug_pointsleads to a core file creation (abort)or to stopping of a process (stop) for furtheranalysis using a system debugger. Syntax:error_log file | stderr |syslog:server=address[。

among others)， in which casea worker process should have write permission for thespecified directory. ， gettimeofday() is onlycalled once per specified interval. Example: timer_resolution 100ms; Internal implementation of the interval depends on the method used: the EVFILT_TIMER filter if kqueue is used; timer_create() if eventport is used; setitimer() otherwise. Syntax:use method; Default:— Context:events Specifies the connection processingmethod to use.There is normally no need to specify it explicitly， setting it to the number of available CPU coreswould be a good start (the value “auto”will try to autodetect it). The auto parameter is supported starting fromversions 1.3.8 and 1.2.5. Syntax:worker_rlimit_core size; Default:— Context:main Changes the limit on the largest size of a core file(RLIMIT_CORE) for worker processes.Used to increase the limit without restarting the main process. Syntax:worker_rlimit_nofile number; Default:— Context:main Changes the limit on the maximum number of open files(RLIMIT_NOFILE) for worker processes.Used to increase the limit without restarting the main process. Syntax:working_directory directory; Default:— Context:main Defines the current working directory for a worker process.It is primarily used when writing a core-file， Core functionality                                                                                                                                                                   Example Configuration user www www;worker_processes 2;error_log /var/log/nginx-error.log info;events {use kqueue;worker_connections 2048;}...Directives Syntax:accept_mutex on | off; Default:accept_mutex on; Context:events If accept_mutex is enabled。

because nginx willby default use the most efficient method. Syntax:user user [group]; Default:user nobody nobody; Context:main Defines user and groupcredentials used by worker processes.If group is omitted， worker_processes 4;worker_cpu_affinity 0001 0010 0100 1000; binds each worker process to a separate CPU，the JIT support is enabled via the--with-pcre-jit configuration parameter. Syntax:pid file; Default:pid nginx.pid; Context:main Defines a file that will store the process ID of the main process. Syntax:ssl_engine device; Default:— Context:main Defines the name of the hardware SSL accelerator. Syntax:thread_poolnamethreads=number[max_queue=number]; Default:thread_pool default threads=32 max_queue=65536; Context:main This directive appeared in version 1.7.11. Defines named thread poolsused for multi-threaded reading and sending of filesworker processes. The threads parameterdefines the number of threads in the pool. In the event that all threads in the pool are busy。