Python obtain CPU Usage rate 、 Memory usage 、 Network usage notes ： Need to install psutil library
#!/usr/bin/env python
#
$Id: iotop.py 1160 2011-10-14 18:50:36Z [email protected] $
#
Copyright (c) 2009, Jay Loden, Giampaolo Rodola'. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
Transplant to NT system by hui.wang, 2012-11-28
Add function of get cpu state and get memory state by hui.wang,2012-11-29
"""
Shows real-time network statistics.
Author: Giampaolo Rodola' <[email protected]>
"""
import sys
import os
import atexit
import time
import psutil
print "Welcome,current system is",os.name," 3 seconds late start to get data..."
time.sleep(3)
line_num = 1
def print_line(str):
print str
function of Get CPU State
def getCPUstate(interval=1):
return (" CPU: " + str(psutil.cpu_percent(interval)) + "%")
function of Get Memory
def getMemorystate():
phymem = psutil.phymem_usage()
buffers = getattr(psutil, 'phymem_buffers', lambda: 0)()
cached = getattr(psutil, 'cached_phymem', lambda: 0)()
used = phymem.total - (phymem.free + buffers + cached)
line = " Memory: %5s%% %6s/%s" % (
phymem.percent,
str(int(used / 1024 / 1024)) + "M",
str(int(phymem.total / 1024 / 1024)) + "M"
)
return line
def bytes2human(n):
"""
>>> bytes2human(10000)
'9.8 K'
>>> bytes2human(100001221)
'95.4 M'
"""
symbols = ('K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y')
prefix = {}
for i, s in enumerate(symbols):
prefix[s] = 1 << (i+1)*10
for s in reversed(symbols):
if n >= prefix[s]:
value = float(n) / prefix[s]
return '%.2f %s' % (value, s)
return '%.2f B' % (n)
def poll(interval):
"""Retrieve raw stats within an interval window."""
tot_before = psutil.network_io_counters()
pnic_before = psutil.network_io_counters(pernic=True)
# sleep some time
time.sleep(interval)
tot_after = psutil.network_io_counters()
pnic_after = psutil.network_io_counters(pernic=True)
# get cpu state
cpu_state = getCPUstate(interval)
# get memory
memory_state = getMemorystate()
return (tot_before, tot_after, pnic_before, pnic_after,cpu_state,memory_state)
def refresh_window(tot_before, tot_after, pnic_before, pnic_after,cpu_state,memory_state):
os.system("cls")
"""Print stats on screen."""
#print current time #cpu state #memory
print_line(time.asctime()+" | "+cpu_state+" | "+memory_state)
# totals
print_line(" NetStates:")
print_line("total bytes: sent: %-10s received: %s" \
% (bytes2human(tot_after.bytes_sent),
bytes2human(tot_after.bytes_recv))
)
print_line("total packets: sent: %-10s received: %s" \
% (tot_after.packets_sent, tot_after.packets_recv)
)
# per-network interface details: let's sort network interfaces so
# that the ones which generated more traffic are shown first
print_line("")
nic_names = pnic_after.keys()
nic_names.sort(key=lambda x: sum(pnic_after[x]), reverse=True)
for name in nic_names:
stats_before = pnic_before[name]
stats_after = pnic_after[name]
templ = "%-15s %15s %15s"
print_line(templ % (name, "TOTAL", "PER-SEC"))
print_line(templ % (
"bytes-sent",
bytes2human(stats_after.bytes_sent),
bytes2human(stats_after.bytes_sent - stats_before.bytes_sent) + '/s',
))
print_line(templ % (
"bytes-recv",
bytes2human(stats_after.bytes_recv),
bytes2human(stats_after.bytes_recv - stats_before.bytes_recv) + '/s',
))
print_line(templ % (
"pkts-sent",
stats_after.packets_sent,
stats_after.packets_sent - stats_before.packets_sent,
))
print_line(templ % (
"pkts-recv",
stats_after.packets_recv,
stats_after.packets_recv - stats_before.packets_recv,
))
print_line("")
try:
interval = 0
while 1:
args = poll(interval)
refresh_window(*args)
interval = 1
except (KeyboardInterrupt, SystemExit):
pass</pre> 
