本文實例講述了Linux平臺PHP5.4設置FPM線程數量的方法。分享給大家供大家參考，具體如下：

PHP5.4安裝完畢后，FPM的默認配置文件位于/usr/local/php/etc/php-fpm.conf.default

>cp /usr/local/php/etc/php-fpm.conf.default /usr/local/php/etc/php-fpm.conf

>vim /usr/local/php/etc/php-fpm.conf

輸入”/www”，搜索www所在的POOL

pm = dynamic

; The number of child processes to be created when pm is set to 'static' and the

; maximum number of child processes when pm is set to 'dynamic' or 'ondemand'.

; This value sets the limit on the number of simultaneous requests that will be

; served. Equivalent to the ApacheMaxClients directive with mpm_prefork.

; Equivalent to the PHP_FCGI_CHILDREN environment variable in the original PHP

; CGI. The below defaults are based on a server without much resources. Don't

; forget to tweak pm.* to fit your needs.

; Note: Used when pm is set to 'static', 'dynamic' or 'ondemand'

; Note: This value is mandatory.

pm.max_children = 5

; The number of child processes created on startup.

; Note: Used only when pm is set to 'dynamic'

; Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2

pm.start_servers = 2

; The desired minimum number of idle server processes.

; Note: Used only when pm is set to 'dynamic'

; Note: Mandatory when pm is set to 'dynamic'

pm.min_spare_servers = 1

; The desired maximum number of idle server processes.

; Note: Used only when pm is set to 'dynamic'

; Note: Mandatory when pm is set to 'dynamic'

pm.max_spare_servers = 3

; The number of seconds after which an idle process will be killed.

; Note: Used only when pm is set to 'ondemand'

; Default Value: 10s

;pm.process_idle_timeout = 10s;

; The number of requests each child process should execute before respawning.

; This can be useful to work around memory leaks in 3rd party libraries. For

; endless request processing specify '0'. Equivalent to PHP_FCGI_MAX_REQUESTS.

; Default Value: 0

;pm.max_requests = 500

解釋一下：

pm = dynamic 如何控制子進程，選項有static和dynamic，默認采用dynamic；如果選擇static，則由pm.max_children指定固定的子進程數。

如果選擇dynamic，則由以下參數決定：

pm.max_children

子進程最大數

pm.start_servers

啟動時的進程數

pm.min_spare_servers

保證空閑進程數最小值，如果空閑進程小于此值，則創建新的子進程

pm.max_spare_servers

保證空閑進程數最大值，如果空閑進程大于此值，則進行清理。對于專用服務器，pm可以設置為static。

pm.max_requests

設置每個子進程重生之前服務的請求數. 對于可能存在內存泄漏的第三方模塊來說是非常有用的. 如果設置為 '0′ 則一直接受請求. 設置為500就可以了(默認0)。

將值修改為如下：

pm.max_children = 32

pm.start_servers = 16

pm.min_spare_servers = 8

pm.max_spare_servers = 32

pm.max_requests = 500

:wq 保存退出VIM

>/usr/local/php/sbin/php-fpm -t

NOTICE: configuration file /usr/local/php/etc/php-fpm.conf test is successful

測試配置文件是否正常，沒問題，殺掉當前的FPM進程

>/usr/local/php/sbin/php-fpm

啟動

希望本文所述對大家PHP程序設計有所幫助。

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