cpu占用分析之火焰图

安装linux对应版本的头文件和内核调试信息

查看版本号

uname -r

安装完成如下

linux-headers-generic
    linux-headers-3.10.20-xxx
    linux-image-3.10.20-xxx
    linux-image-3.10.20-xxx-dbg

或者

linux-headers-generic
linux-headers-3.13.0-88
linux-headers-3.13.0-88-generic    
linux-image-3.13.0-88-generic
linux-image-3.13.0-88-generic-dbgsym

 

安装nginx调试信息

安装依赖库

sudo apt-get install linux-headers-generic gcc libcap-dev
    sudo apt-get install elfutils
    sudo apt-get install libluajit-5.1-dev
    sudo apt-get install liblua5.1-0-dbg

安装systemtab

sudo apt-get install systemtap

检查安装是否成功

stap -e 'probe kernel.function("sys_open") {log("hello world") exit()}'

下载生成工具

https://github.com/openresty/nginx-systemtap-toolkit
    https://github.com/brendangregg/FlameGraph

生成火焰图

ps aux | grep nginx
  ./nginx-systemtap-toolkit/sample-bt -p [worker-pid] -t 5 -u > a.bt

  FlameGraph/stackcollapse-stap.pl a.bt > a.cbt
  FlameGraph/flamegraph.pl a.cbt > a.svg

　也可以使用ngx-sample-lua-bt

参考

systemtap

• ​​http://xuclv.blog.51cto.com/5503169/1184517/​​
• ​​http://wiki.jikexueyuan.com/project/openresty-best-practice/install.html​​
• ​​http://openresty.org/en/build-systemtap.html​​

nginx-systemtap-toolkit

下载

​​https://github.com/openresty/nginx-systemtap-toolkit​​

说明

​​https://github.com/openresty/nginx-systemtap-toolkit/blob/master/README-CN.markdown#ngx-sample-bt​​

​​https://github.com/openresty/nginx-systemtap-toolkit#ngx-sample-bt​​

FlameGraph

​​https://github.com/brendangregg/FlameGraph​​