Simple linux system monitoring using /proc

imer-monitor.py

#!/usr/bin/python
import threading
import requests
TIMER_CYCLE = 10
config = {'net': {'device': 'eth0'}}#execfile("/etc/imer-monitor/config.py", {})
def update():
	global config
	threading.Timer(TIMER_CYCLE, update).start()
	with open("/sys/class/net/{}/statistics/rx_bytes".format(config['net']['device']), "r") as frx, open("/sys/class/net/{}/statistics/tx_bytes".format(config['net']['device']), "r") as ftx:
		rx = int(frx.read())
		tx = int(ftx.read())
		update.network = ((rx-update.network[2])/TIMER_CYCLE, (tx-update.network[3])/TIMER_CYCLE, rx, tx)
	
	with open("/proc/meminfo", "r") as mem:
		tmp = 0
		total = 0
		for i in mem:
			sline = i.split()
			if str(sline[0]) == 'MemTotal:':
				total = int(sline[1])
			elif str(sline[0]) in ('MemFree:', 'Buffers:', 'Cached:'):
				tmp += int(sline[1])
		update.memory = total - tmp
	
	with open("/proc/loadavg", "r") as load:
		update.load = load.read().split(" ")[0]
	
	with open("/proc/stat", "r") as cpu:
		c = cpu.readline()
		stats = filter(None, (c.split(" ")[1:]))
		total = 0
		for a in stats:
			total += int(a)
		idle = int(stats[3])+int(stats[4])
		update.cpu['pct'] = ((total-update.cpu['prev']['total'])-(idle-update.cpu['prev']['idle']))/float(total-update.cpu['prev']['total'])
		update.cpu['prev']['total'] = total
		update.cpu['prev']['idle'] = idle
	if update.first:
		update.first = False
		return
	print "{0}b/s {1}kB {2}% {3}".format(update.network[0]+update.network[1], update.memory, update.cpu['pct'], update.load)
	#requests.post(config['report_url'], data = {'key':config['key'],'network':update.network[0]+update.network[1], 'memory': update.memory, 'load': update.load, 'cpu': update.cpu['pct']})
update.first = True
update.network = [0,0,0,0]
update.memory = 0
update.cpu = {
	'pct':0.0,
	'prev': {'idle':0, 'total':0}
}
update.load = 0.0
update()