Performance Monitoring Stats - Raspberry Pi Command Line NMON

 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               

Example Screenshots