Monitoring Tools

sar

• It collects, reports, and saves system activity information.
• It displays CPU usage statistics.

sudo apt-get install sysstat
sar -u 1 3

glances

• It is a cross-platform system monitoring tool.

sudo apt-get install glances
glances

nmon (Nigel's Monitor)

• It provides comprehensive view of system performance.

sudo apt-get install nmon
nmon