NMON – Command Line Performance Monitoring Tool

To install nmon


sudo apt-get install nmon

To run nmon


nmon

Use the keyboard commands to toggle individual sections on and off:

't' = Top-processes

'm' – Memory S

'j' = Filesystems

'd' or 'D' = Disks (capital D shows different measurements)

'n' = Network

'V' = Virtual Memory

'r' = Resource

'N' = NFS

'k' = kernel

'.' = only busy disks/procs

'q' = quit

There a good article on how to use it here.

Shortcut Keys to Display CPU Stats

HELP: Hit h to remove this Info Hit q to Quit ───────────────────────────│

│ Letters which toggle on/off statistics: │

│ h = This help | r = Resources OS & Proc │

│ c = CPU Util C = wide view | l = longer term CPU averages │

│ m = Memory & Swap L=Huge | V = Virtual Memory │

│ n = Network | N = NFS │

│ d = Disk I/O Graphs D=Stats | o = Disks %Busy Map │

│ k = Kernel stats & loadavg | j = Filesystem Usage J=reduced │

│ M = MHz by thread & CPU │

│ t = TopProcess 1=Priority/Nice/State | u = TopProc with command line │

│ ReOrder by: 3=CPU 4=RAM 5=I/O | Hit u twice to update │

│ g = User Defined Disk Groups | G = with -g switches Disk graphs │

│ [start nmon with -g <filename>] | to disk groups only │

│ | b = black & white mode │

│ Other Controls: | │

│ + = double the screen refresh time | 0 = reset peak marks (">") to zero │

│ - = half the screen refresh time | space refresh screen now │

│ . = Display only busy disks & CPU | q = Quit