CentOS

yum install sysstat

Ubuntu

sudo apt-get install sysstat

Show version of systat:

sar -V

Show CPU statistics 3 times with 1 second interval:

sar 1 3

CPU usage of all CPUs (focus on the last field “%idle” to see the cpu load):

sar -u 1 3

Show CPU usage for the current day

sar -u

Swap Space show for current day

sar -S

Show swap space for 1 second interval 3 times:

sar -S 1 3

sar -q -f /var/log/sa/sa23 -s 10:00:01

sar -p | grep -A5 "07:45"

sar -q