# linux性能排查

1. 系统整体
   1. vmstat 1：每秒输出一次系统核心指标
   2. dmesg | tail：输出系统日志最后10行
2. CPU
   1. uptime：快速查看系统CPU负载情况：1分钟、5分钟、15分钟
   2. top：整体负载情况，通过P来排序CPU，通过M来排序内存
   3. mpstat -P ALL 1：每秒输出每个 CPU 的占用情况，如果有一个 CPU 占用率特别高，那么有可能是一个单线程应用程序引起的
3. 内存
   1. free -m：内存使用情况
4. 磁盘IO
   1. iostat -xz 1：每秒输出机器磁盘 IO 情况
5. 网络IO
   1. sar -n DEV 1: 每秒输出网络设备的吞吐率
   2. sar -n TCP,ETCP 1：每秒输出TCP连接状态
   3. route -n：路由信息
   4. dig,nslookup：DNS状态
   5. traceroute：路由节点状况与延时
6. 进程
   1. pidstat 1：每秒输出进程的CPU占用率
   2. tcpdump: 网络包协议追踪
   3. netstat：tcp连接信息
   4. ps -ef / -aux
   5. strace -p pid


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