linux 服务器负载很高，缘由貌似是 php进程过多，而且一直保持 400多-PHP Tutorial-php.cn

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linux 服务器负载很高，缘由貌似是 php进程过多，而且一直保持 400多

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Jun 06, 2016 pm 08:51 PM

linuxphp

linux 服务器负载很高，缘由貌似是 php进程过多，而且一直保持 400多，有图所示，php-cgi 进程数一直是不降的，没有用户访问网站也是这么多，每个进程大概占用内存150-200M左右，16G内存有时候会阻塞。求大牛帮忙。，负载有时候会达到顶峰，前无古人后无来者，120 负载，cpu 跑满。求教

回复内容：

可以考虑用fastcgi.
http://php.net/manual/en/install.fpm....

这么多的进程数load值很高也是可以预见的，建议还是查下PHP执行过程中的性能瓶颈究竟在哪。

mod_php是和apache同步执行的, 如果fastcgi的话, 服务器(一般nginx)和php之间是异步关系, 在某些情况下可以无需那么多php进程

打个比方, 如果一个用户用龟速上传一个文件, 那么apache和apache里面的那个php就在等待这个用户上传完成, 所以系统里面就需要更多的apache进程来应对并发

如果异步执行, 那么nginx在处理用户的上传, 一旦用户上传文件完成, 传给php处理只是一瞬间的事情.

当然有时候fastcgi也不一定能解决问题, 比如php在等待一个sql查询, 这个查询花了5秒, 那么5秒之内有新用户来访, 这个php就不能出门欢迎, 所以必须新开一个php进程

所以查一查你的php执行要花多久, 再看一看自己的访问量, 综合的去找原因并想办法解决吧

每个php进程都是很费内存的，建议根据服务器配置做适当调整，修改fastcgi配置文件或php-fpm配置文件，一般100个内对于大部分场景就够用了，再多就要考虑做任务调度或者消息队列处理了

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