Description:

Atsar can be used to measure the load on the most relevant system
resources, such as CPU, disk, memory and network. Long-term analysis
can be done via cron, by maintaining log files with statistical
information. Short-term analysis can be done by starting the command
atsar with an interval and a number of samples. The current version of
atsar gathers statistics about the utilization of CPU's, disks, memory
and swap, serial lines and network (TCP/IP v4 and v6).