ASCII/terminal CPU usage graph. Bars are split into coloured blocks for each CPU if termcolor module is available, otherwise a single bar is shown

cpu-usage.py

#!/usr/bin/env python
import math
import os
import psutil
import sys
import time

try:
    import termcolor
    TERMCOLORS = termcolor.COLORS.keys()
except ImportError:
    TERMCOLORS = None


def get_term_size():
    import fcntl
    import struct
    import termios
    return struct.unpack('hh', fcntl.ioctl(os.open(
        os.ctermid(), os.O_RDONLY), termios.TIOCGWINSZ, '0000'))

def get_bars(ps, scale):
    cps = [0]
    for p in ps:
        cps.append(p * scale + cps[-1])
    icps = [math.ceil(c) for c in cps]
    bars = [int(a - b) for a, b in zip(icps[1:], icps[:-1]) if a > b]
    return bars

def color(text, i):
    if TERMCOLORS:
        return termcolor.colored(text, TERMCOLORS[i % len(TERMCOLORS)],
            'on_' + TERMCOLORS[(i + 1) % len(TERMCOLORS)])
    return text

try:
    w = get_term_size()[1]
    scale = (w - 7) / 100.0
except Exception:
    scale = 1.0

if len(sys.argv) > 1:
    interval = int(sys.argv[1])
else:
    interval = 2

ps = sorted(psutil.cpu_percent(percpu=True), reverse=True)
while True:
    time.sleep(interval)
    ps = sorted(psutil.cpu_percent(percpu=True), reverse=True)
    bars = sorted(get_bars(ps, scale / len(ps)), reverse=True)
    s = '%5.1f ' % (sum(ps) / len(ps))
    for n in xrange(len(bars)):
        s += color('#' * bars[n], n)
    print s