Performance / Activity monitoring

top

Shows process using CPU and memory

Shows process doing IO, "-o" shows only the process actually doing IO instead of all processes.

Shows network activities by address / port etc. but no process showed

the only tool (said) to monitor network traffic by process

if vpn enabled, be sure to choose the correct tunnel interface, or nothing is monitored

Command tools to monitor linux performance

http://www.tecmint.com/command-line-tools-to-monitor-linux-performance/

top - original tool

htop - adds support to multicore/cpu

iotop - input/output monitoring

iftop - network monitoring

atop - merges previous elements into a single overview

slabtop – displays a listing of the top caches