=== 查看网卡带宽 ===
sudo ethtool em1|grep Speed
=== 查看网卡流量 ===
sudo iftop
=== 查看端口流量 ===
sudo iftop -P
=== 查看磁盘io ===
sudo iotop
=== 查看进程内存使用 ===
top
=== 查看load === 
uptime