The program atop is an interactive monitor to view the load on
a Linux-system. It shows the occupation of the most critical
hardware-resources (from a performance point of view) on system-level,
i.e. cpu, memory, disk and network. It also shows which processes are
responsible for the indicated load (again cpu-, memory-, disk- and
network-load on process-level).
The program atop can also be used to log system- and process-level
information in raw format for long-term analysis.

The program atopsar can be used to view system-level statistics as
reports, similar to the program sar.