psutil is a module providing an interface for retrieving information on all
running processes and system utilization (CPU, memory, disks, network, users) in
a portable way by using Python, implementing many functionalities offered by
command line tools such as: ps, top, df, kill, free, lsof, free, netstat,
ifconfig, nice, ionice, iostat, iotop, uptime, pidof, tty, who, taskset, pmap.