关于php配置参数

阳光穿透心脏的1/2处 2022-01-09 23:29 196阅读 0赞

没事查看了一下php日志，发现提示进程数不够，日志信息如下：

\[04-Nov-2014 14:19:08\] WARNING: \[pool www\] seems busy (you may need to increase pm.start\_servers, or pm.min/max\_spare\_serve

rs), spawning 8 children, there are 0 idle, and 15 total children

\[04-Nov-2014 14:29:27\] WARNING: \[pool www\] seems busy (you may need to increase pm.start\_servers, or pm.min/max\_spare\_serve

rs), spawning 8 children, there are 0 idle, and 16 total children

\[04-Nov-2014 16:51:04\] NOTICE: Finishing ...

\[04-Nov-2014 16:51:04\] NOTICE: exiting, bye-bye!

\[04-Nov-2014 16:51:06\] NOTICE: fpm is running, pid 31023

\[04-Nov-2014 16:51:06\] NOTICE: ready to handle connections

\[04-Nov-2014 19:01:05\] WARNING: \[pool www\] seems busy (you may need to increase pm.start\_servers, or pm.min/max\_spare\_serve

rs), spawning 8 children, there are 0 idle, and 17 total children

\[04-Nov-2014 19:54:47\] WARNING: \[pool www\] seems busy (you may need to increase pm.start\_servers, or pm.min/max\_spare\_serve

rs), spawning 8 children, there are 0 idle, and 17 total children

\[04-Nov-2014 20:36:06\] WARNING: \[pool www\] seems busy (you may need to increase pm.start\_servers, or pm.min/max\_spare\_serve

rs), spawning 8 children, there are 0 idle, and 19 total children

\[04-Nov-2014 21:18:56\] WARNING: \[pool www\] seems busy (you may need to increase pm.start\_servers, or pm.min/max\_spare\_serve

rs), spawning 8 children, there are 0 idle, and 17 total children

\[05-Nov-2014 05:30:04\] WARNING: \[pool www\] seems busy (you may need to increase pm.start\_servers, or pm.min/max\_spare\_serve

rs), spawning 8 children, there are 0 idle, and 15 total children

\[05-Nov-2014 11:01:37\] WARNING: \[pool www\] seems busy (you may need to increase pm.start\_servers, or pm.min/max\_spare\_serve

rs), spawning 8 children, there are 0 idle, and 17 total children

\[05-Nov-2014 11:01:38\] WARNING: \[pool www\] seems busy (you may need to increase pm.start\_servers, or pm.min/max\_spare\_serve

rs), spawning 16 children, there are 0 idle, and 21 total children

使用下面的命令查看php进程：

\[root@test ~\]\# ps -ef |grep php

root 25874 20907 0 11:56 pts/0 00:00:00 more index.php

www 26030 31023 32 12:02 ? 00:00:26 php-fpm: pool www

www 26037 31023 31 12:02 ? 00:00:22 php-fpm: pool www

www 26042 31023 31 12:02 ? 00:00:20 php-fpm: pool www

www 26046 31023 30 12:02 ? 00:00:17 php-fpm: pool www

www 26054 31023 30 12:02 ? 00:00:15 php-fpm: pool www

www 26059 31023 30 12:02 ? 00:00:14 php-fpm: pool www

www 26062 31023 30 12:03 ? 00:00:12 php-fpm: pool www

www 26063 31023 30 12:03 ? 00:00:09 php-fpm: pool www

www 26066 31023 30 12:03 ? 00:00:09 php-fpm: pool www

www 26089 31023 23 12:03 ? 00:00:02 php-fpm: pool www

www 26092 31023 24 12:03 ? 00:00:01 php-fpm: pool www

root 26097 25911 0 12:03 pts/1 00:00:00 grep php

root 31023 1 0 Nov04 ? 00:00:09 php-fpm: master process (/usr/local/php5/etc/php-fpm.conf)

内存占用情况：只用了2G左右的内存

\[root@test etc\]\# free -m

total used free shared buffers cached

Mem: 19990 19685 304 0 256 16949

\-/+ buffers/cache:  2480  17509

Swap: 19999 112 19887

打开配置文件php-fpm.conf发现：pm.max\_children = 5

[![wKiom1RZ1u3SDyFKAAFuqjFfjAA932.jpg][]][wKiom1RZ1u3SDyFKAAFuqjFfjAA932.jpg]

修改成如下参数后，发现php日志中无此报警了：

; Note: This value is mandatory.

pm.max\_children = 1024

; 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 = 512

; 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 = 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 = 512

查看php-fpm的子进程数，跟配置文件里面设置的一样，等于pm.start\_servers+pm.min\_spare\_servers

\[root@test etc\]\# ps -ef |grep php |wc -l

515

修改php配置文件后，内存占用从2G变成了6.8G左右，增长了4.8G左右，一个php进程开销占到了8M左右，这个可以根据实际的内存情况来进行修改。

\[root@localhost log\]\# free -m

total used free shared buffers cached

Mem: 19990 19438 551 0 189 12414

\-/+ buffers/cache: 6835  13154

Swap: 19999 129 19870

补充：

php-fpm有一个参数 max\_requests，该参数指明了，每个children最多处理多少个请求后便会被关闭，默认的设置是500。因为php是把请求轮询给每个children，在大流量下，每个childre到达max\_requests所用的时间都差不多，这样就造成所有的children基本上在同一时间被关闭，这样会导致此时nginx发给php的请求无法得到相应，会出现短时间的502.解决方法：

增加children的数量，并且将 max\_requests 设置未 0 或者一个比较大的值

一般增加max\_requests到102400，可能有效果。

转载于:https://blog.51cto.com/lxshopping/1572204

[wKiom1RZ1u3SDyFKAAFuqjFfjAA932.jpg]: /images/20220109/c17ecf55643d425e8da17dcdee6722f7.png