LMLPHP后院

扫码查看  原文链接 : https://blog.lmlphp.com/archives/626/php-fpm_is_a_very_difficult_software  来自 : LMLPHP后院

看着配置文件的描述，我硬是没有弄懂 server 和 children 都是是什么关系，是一样的东西吗！？既然 start_servers 的默认值是算出来的，为什么还需要配置啊！

pm.start_servers 配置错误导致暂停了服务，真的是太操蛋了，顺滑重启导致服务暂停，这真让人抓狂啊😫

看看官方的文档

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 = 32

; 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
pm.start_servers = 10

; 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
pm.min_spare_servers = 4

; 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
pm.max_spare_servers = 16

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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 = 32; 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 = 2pm.start_servers = 10; 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 = 1pm.min_spare_servers = 4; 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 = 3pm.max_spare_servers = 16

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

0
Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2

既然 start_servers 值是确定的，那么为什么还需要别人配置呢？上面的公式让无数人费解，➕号后面倒是打个括号啊！！！在配置文件中这样写会让人费解的，难道配置文件还遵守运算优先级？？？