tload—Graphic representation of system load average
tload [-s scale] [-d delay] [tty]
tload prints a graph of the current system load average to the specified tty (or the tty of the tload process if none is specified).
The -s scale option allows a vertical scale to be specified for the display (in characters between graph ticks); thus, a smaller value represents a larger scale, and vice versa.
The -d delay sets the delay between graph updates in seconds.
/proc/loadavg Load average information