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vuload.py
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vuload.py
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#!/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2010 José de Paula Eufrásio Júnior <jose.junior@gmail.com>
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import sys
import signal
import curses
import datetime
from curses import panel
delay = 3.0
load_multiplier = 4
def get_load():
raw_load = open('/proc/loadavg').readline()
load = raw_load.split()[:3]
return load
def get_cpus():
cpus = 0
for line in open('/proc/cpuinfo'):
if line.strip().startswith('processor'):
cpus += 1
return cpus
def draw_load(p_load, loads):
n_cpus = get_cpus()
w_load = p_load.window()
y, x = w_load.getmaxyx()
half_screen = x / 2
initial_line = 2
w_load.addstr(1, 1, "0", curses.A_BOLD)
w_load.addstr(1, half_screen, str(n_cpus), curses.A_BOLD)
w_load.addstr(1, x - (1 + len(str(n_cpus * load_multiplier))),
str(n_cpus * load_multiplier), curses.A_BOLD)
for load in loads:
load = float(load)
too_big = False
if load > n_cpus * load_multiplier:
too_big = True
true_load = load
load = n_cpus * load_multiplier
if load <= n_cpus:
prop = float(load) / n_cpus
squares = prop * half_screen
w_load.hline(initial_line,1,chr(219),int(squares))
initial_line +=1
elif load > n_cpus:
prop = (float(load)) / (n_cpus * load_multiplier)
squares = half_screen + (prop * half_screen)
w_load.hline(initial_line,1,chr(219),int(squares - 2))
if too_big:
diff = int(true_load - load)
end_line = x - (2 + len(str(diff)))
w_load.addstr(initial_line, end_line, '+' + str(diff),
curses.A_BOLD)
initial_line +=1
def check_screen_size(x, y):
if (x < 40) or (y < 10):
raise Exception("Minimum terminal size is 40x10")
sys.exit(2)
def update_header(p_header):
raw_load = get_load()
load = ', '.join(raw_load)
w_header = p_header.window()
w_header.erase()
w_header.box()
w_header.addstr(1, 1, "Time:")
w_header.addstr(1, 16, "Hostname:")
w_header.addstr(2, 1, "Load Average:")
w_header.addstr(1, 26, os.uname()[1], curses.A_BOLD)
w_header.addstr(1, 7, str(datetime.datetime.now().strftime('%H:%M:%S')),
curses.A_BOLD)
w_header.addstr(2, 15, load, curses.A_BOLD)
update_screen()
def update_load(p_load):
w_load = p_load.window()
w_load.erase()
w_load.box()
draw_load(p_load, get_load())
update_screen()
def update_screen():
panel.update_panels()
curses.doupdate()
def main(stdscr):
scr = stdscr
scr.nodelay(1)
scr.timeout(int(delay) * 1000) # more responsive feeling than time.sleep
curses.curs_set(0)
scr.addstr(10,1, "Press: 'q' to exit.", curses.A_BOLD)
w_header = curses.newwin(4, 0, 0, 0)
w_load = curses.newwin(6,0,4,0)
p_header = panel.new_panel(w_header)
p_load = panel.new_panel(w_load)
update_header(p_header)
update_load(p_load)
while 1:
ch = scr.getch()
if ch == ord('q'):
break
else:
y, x = scr.getmaxyx()
check_screen_size(x, y)
update_header(p_header)
update_load(p_load)
curses.endwin()
signal.signal(signal.SIGWINCH, signal.SIG_IGN)
curses.wrapper(main)