PHP相关性能配置
使用php-fpm时的默认配置一般都比较低，需要修改，常见的问题可以从日志中获取，如果你发现服务器挂了，查看下日志一般都会找到问题。
pm = dynamic
这个参数默认为dynamic，它有3种：static, dynamic, ondemand
1、这个可能是你遇到的第一个问题
tail -f /var/log/php5-fpm.log [25-Jan-2019 04:43:41] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it [25-Jan-2019 05:10:18] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it [25-Jan-2019 06:41:22] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it [25-Jan-2019 06:48:03] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
产生上面问题需要将默认值5修改为更多，假设每个进程会占用20多兆内存（自己实际查下，不同的应用占用应该不同），根据机器可用内存算下，虚拟机上跑的我这里用了50（如果日志中还是出现，那就继续增加直到服务器最大并发负荷，还不行那就得想其它解决方案了）；dyanmic模式下pm.max_children限制的是最大alive状态的数量；如果是static模式，将总是保持指定数量的进程；
pm.max_children = 50
通过如下命令修改
sed -i 's/pm.max_children = [0-9]*/pm.max_children = 50/g' /etc/php5/fpm/pool.d/www.conf
重启生效
/etc/init.d/php5-fpm restart
2、你应该还会还遇到下面问题
[25-Jan-2019 08:29:47] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 0 idle, and 6 total children [25-Jan-2019 08:29:48] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 16 children, there are 0 idle, and 7 total children
那么你需要配置一下几个参数
pm.max_children = 50 # dynamic模式时，限制alive状态children pm.start_servers = 15 # dynamic模式起作用，初始准备的进程数量 pm.min_spare_servers = 10 # dynamic模式起作用，如果空闲的进程小于这个值将会创建新的进程 pm.max_spare_servers = 40 # dynamic模式起作用，如果空闲的进程大于这个值将开始kill；
上命令行
sed -i 's/pm.max_children = [0-9]*/pm.max_children = 50/g' /etc/php5/fpm/pool.d/www.conf sed -i 's/pm.start_servers = [0-9]*/pm.start_servers = 15/g' /etc/php5/fpm/pool.d/www.conf sed -i 's/pm.min_spare_servers = [0-9]*/pm.min_spare_servers = 10/g' /etc/php5/fpm/pool.d/www.conf sed -i 's/pm.max_spare_servers = [0-9]*/pm.max_spare_servers = 40/g' /etc/php5/fpm/pool.d/www.conf
重启生效
/etc/init.d/php5-fpm restart
3、这个也得说说
pm.max_requests = 500
这个配置与进程回收有关，防止内存泄漏，当每个进程被请求指定次数后关闭这个进程，用新的进程来处理请求。
sed -i -e '/;pm.max_requests/s/^;//' -e 's/pm.max_requests = [0-9]*/pm.max_requests = 500/g' /etc/php5/fpm/pool.d/www.conf | grep max_requests
重启生效
/etc/init.d/php5-fpm restart
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