本文实例讲述了Linux平台PHP5.4设置FPM线程数量的方法。分享给大家供大家参考，具体如下：
PHP5.4安装完毕后，FPM的默认配置文件位于/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
输入”/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
解释一下：
pm = dynamic 如何控制子进程，选项有static和dynamic，默认采用dynamic；如果选择static，则由pm.max_children指定固定的子进程数。
如果选择dynamic，则由以下参数决定：
| pm.max_children | 子进程最大数 |
| pm.start_servers | 启动时的进程数 |
| pm.min_spare_servers | 保证空闲进程数最小值，如果空闲进程小于此值，则创建新的子进程 |
| pm.max_spare_servers | 保证空闲进程数最大值，如果空闲进程大于此值，则进行清理。对于专用服务器，pm可以设置为static。 |
| pm.max_requests | 设置每个子进程重生之前服务的请求数. 对于可能存在内存泄漏的第三方模块来说是非常有用的. 如果设置为 '0′ 则一直接受请求. 设置为500就可以了（默认0）。 |
将值修改为如下：
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
测试配置文件是否正常，没问题，杀掉当前的FPM进程
>/usr/local/php/sbin/php-fpm
启动
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