写在前面：本篇文章融合了网络上多方的内容进行整合，经过实际操作成功后进行的重新编译。比如问题角度的变换引起的性能测试工具或参数的变动等。某些关键知识点也会有相应的补充。实验实例采用阿里云ECS产品，参数为2C8G T5型实例，CentOS 7.4系统。除了安装软件的方式有所不同，Ubuntu、rh等...

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公司内网有台memcache服务器经常挂了，是台vm机器，ssh不能登录。用VM软件进去，看到内存有溢出，所有命令都不起作用。只能通过VM的终端重起，每次重起后，没过几天，又挂了。因为是开发的测试虚拟机，所以一直没在意。今天又瞟了一下虚拟平台，发现有红色报警...

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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