白话火焰图---火丁笔记
https://huoding.com/2016/08/18/531
https://linux.cn/article-4670-1.html
http://xuclv.blog.51cto.com/5503169/1184517/
http://wiki.jikexueyuan.com/project/openresty-best-practice/install.html
http://blog.csdn.net/softwarehe/article/details/46377869
http://www.cnblogs.com/sxhlinux/p/6250619.html