Atop

How to install Atop

yum install atop

Change Default Intervals

Open /etc/default/atop and change LOGINTERVAL=600 to LOGINTERVAL=60

vi /etc/default/atop

Log Locations

Location: /var/log/atop

Check available logs using: 
ls -lart /var/log/atop/

Check logs for a particular time

Syntax: atop -r path-to-log-file -bYYYYMMDDHH:MM

Example: atop -r /var/log/atop/atop-20240615 -b12:00
atop -r /var/log/atop/atop-20240615 -b20240612512:00

Live usage with ATOP

Show CPU usage

atop -c

Show Memory usage

atop -m

Show disk utilization

atop -d

Where:
RRDSK shows read disk
WRDSK shows write disk
DSK shows general disk usage
CMD shows related command

Display process information=

atop -p

Where:
SYSCPU display system side CPU usage
USRCPU display user side CPU usage
VSIZE display virtual memory size
RSIZE display real memory size
RDDSK display disk read
WRDSK display disk write
RNET display network receive
SNET display network send
CPU display shortcut
CPU usage percentage
CMD display related command

=Display process information according to user

atop -u

Show active processes

atop -a