10月开始学习python, 学习一段时间之后，发现python真的是一门非常优美，开发迅速的语言， 漂亮的缩进， 功能强大的模块，丰富的图形库， 同时还能自己用c/c++添加你需要的扩展。
10月28号的， 在熟悉了这么一段时间后， 简单的用python+wxPython写了一个linux下的系统监控程序， 主要监控系统的cpu，内存，网络流量，磁盘， 主要是直接分析proc来获取各种信息。 然后图形界面是wxPython， 功能简单，直观。
如图（各种数据都是每秒钟刷新一次）：
import threading,re,time,sys,os
from subprocess import *
from shlex import split
#global Variables
prev_cpu_info = {"user":0,"system":0,"idle":0,"iowait":0}
cpu_stat = []
prev_partition_info = []
HZ = 100
SLEEP_TIME = 3
prev_net_info = {"in":0,"out":0}
class SysMonitor(threading.Thread):
def __init__(self,name,eventList,eventListMutex):
threading.Thread.__init__(self)
self.name = name
self.eventList = eventList
self.eventListMutex = eventListMutex
self.running = True
self.runningMutex = threading.Lock()
def stop(self):
self.runningMutex.acquire()
self.running = False
self.runningMutex.release()
def calculate_deltams(self):
ncpu = self.get_numbers_of_cpu()
if len(cpu_stat) == 0:
raise Exception("Please run check_cpu() at first!")
deltams = 1000.0 * ((cpu_stat['user'] + cpu_stat['system'] + cpu_stat['idle'] + cpu_stat['iowait']) - (prev_cpu_info['user'] + prev_cpu_info['system'] + prev_cpu_info['idle'] + prev_cpu_info['iowait'])) / ncpu / HZ
return deltams
def get_numbers_of_cpu(self):
try:
cpufp = file("/proc/cpuinfo")
ncpu = 0
while True:
line = cpufp.readline()
if len(line) < 1:
break
if re.search(r"processor\t:",line) != None:
ncpu += 1
finally:
cpufp.close()
return ncpu
def get_cpu_stat(self):
cpu_info = {
"user" : 0,
"system": 0,
"idle" : 0,
"iowait": 0
}
try:
cpustatfp = file("/proc/stat")
line = split(cpustatfp.readline())
cpu_info['user'] = float(line[1]) + float(line[2])
cpu_info['system'] = float(line[3]) + float(line[6]) + float(line[7])
cpu_info['idle'] = float(line[4])
cpu_info['iowait'] = float(line[5])
finally:
cpustatfp.close()
return cpu_info
def check_cpu(self):
global prev_cpu_info,cpu_stat
cpu = {
"user" : 0,
"system": 0,
"idle" : 0,
"iowait": 0
}
if prev_cpu_info['system'] == 0:
prev_cpu_info = self.get_cpu_stat()
time.sleep(1)
else:
prev_cpu_info = cpu_stat
cpu_stat = self.get_cpu_stat()
cpu['user'] = cpu_stat['user'] - prev_cpu_info['user']
cpu['system'] = cpu_stat['system'] - prev_cpu_info['system']
cpu['idle'] = cpu_stat['idle'] - prev_cpu_info['idle']
cpu['iowait'] = cpu_stat['iowait'] - prev_cpu_info['iowait']
total = (cpu['user'] + cpu['system'] + cpu['idle'] + cpu['iowait'] )
cpu['user'] = cpu['user'] / total * 100
cpu['system'] = cpu['system'] / total * 100
cpu['idle'] = cpu['idle'] / total * 100
cpu['iowait'] = cpu['iowait'] / total * 100
return cpu
def get_disk_stat(self):
diskfp = open('/proc/diskstats')
all_partition = []
curr = {
"major":0,
"minor":0,
"name" : None, #disk name
"rd_ios" : 0, #read I/O operation
"rd_merges" : 0, #readed merged
"rd_sectors" : 0, #sectors readed
"rd_ticks" : 0, #time in queue and server for read
"wr_ios" : 0, #write I/O operation
"wr_merges" : 0, #write merged
"wr_sectors" : 0, #sectors writed
"wr_ticks" : 0, #time in queue and server for write
"ticks" : 0, #time of request in queue
"aveq" : 0 #average queue length
}
while True:
line = split(diskfp.readline())
if len(line) == 0:
break
if int(line[3]) == 0:
continue
curr['major'] = line[0]
curr['minor'] = line[1]
curr['name'] = line[2]
curr['rd_ios'] = float(line[3])
curr['rd_merges'] = float(line[4])
curr['rd_sectors'] = float(line[5])
curr['rd_ticks'] = float(line[6])
curr['wr_ios'] = float(line[7])
curr['wr_merges'] = float(line[8])
curr['wr_sectors'] = float(line[9])
curr['wr_ticks'] = float(line[10])
curr['ticks'] = float(line[11])
curr['aveq'] = float(line[12])
all_partition.append(curr.copy())
return all_partition
def check_disk(self):
global prev_partition_info
DISK_STAT = []
deltams = self.calculate_deltams()
curr_partition_info = self.get_disk_stat()
if len(prev_partition_info) == 0:
prev_partition_info = curr_partition_info
curr_partition_info = self.get_disk_stat()
partition_num = len(curr_partition_info)
i = 0
while i < partition_num:
disk_info = curr_partition_info[i]
prev_disk_info = prev_partition_info[i]
rd_ios = disk_info['rd_ios'] - prev_disk_info['rd_ios']
rd_merges = disk_info['rd_merges'] - prev_disk_info['rd_merges']
rd_sectors = disk_info['rd_sectors'] - prev_disk_info['rd_sectors']
rd_ticks = disk_info['rd_ticks'] - prev_disk_info['rd_ticks']
wr_ios = disk_info['wr_ios'] - prev_disk_info['wr_ios']
wr_merges = disk_info['wr_merges'] - prev_disk_info['wr_merges']
wr_sectors = disk_info['wr_sectors'] - prev_disk_info['wr_sectors']
wr_ticks = disk_info['wr_ticks'] - prev_disk_info['wr_ticks']
ticks = disk_info['ticks'] - prev_disk_info['ticks']
aveq = disk_info['aveq'] - prev_disk_info['aveq']
# prev_disk_info = disk_info #store the old info
prev_partition_info[i] = curr_partition_info[i]
i = i + 1
n_ios = rd_ios + wr_ios
n_ticks = rd_ticks + wr_ticks
n_kbytes = (rd_sectors + wr_sectors) / 2.0
queue = aveq / deltams
if n_ios:
size = n_kbytes / n_ios
wait = n_ticks / n_ios
else:
size = 0.0
wait = 0.0
busy = 100.0 * ticks / deltams
if busy > 100.0:
busy = 100
# print rd_sectors,wr_sectors
readPerSec = str(1000 * rd_sectors / deltams / 2.0 * 1024)
writePerSec = str(1000.0 * wr_sectors / deltams / 2.0 * 1024)
readPerSec = readPerSec[:readPerSec.find(".") + 3]
writePerSec = writePerSec[:writePerSec.find(".") + 3]
#calculate total size and free size for every partition
try:
mounts = open("/etc/mtab")
#initialize
total_size = 0
free_size = 0
while True:
line = mounts.readline().strip()
if len(line) <1:
break
if line.find(disk_info['name'] + " ") != -1:
line = line.split()
s = os.statvfs(line[1])
total_size = s.f_bsize * s.f_blocks #unit : bytes
free_size = s.f_bsize * s.f_bavail #
break
finally:
mounts.close()
DISK_STAT.append({"name":disk_info["name"],"total_size":total_size,"free_size":free_size,"readPerSec":readPerSec,"writePerSec":writePerSec,"wait":wait,"queue":queue,"size":size})
return DISK_STAT
def get_net_stat(self,eth):
try:
netfp = file("/proc/net/dev")
while True:
line = netfp.readline()
if re.search(eth,line) != None:
line = split(line[7:])
netin = int(line[0])
netout = int(line[8])
break
finally:
netfp.close()
return netin,netout
def checkNet(self):
global prev_net_info
NET_STATS = []
net_stat = self.get_net_stat('wlan0') #Caution!!! This should be the Ethernet card in use!!!
if prev_net_info['in'] == 0 and prev_net_info['out'] == 0:
prev_net_info['in'] = net_stat[0]
prev_net_info['out'] = net_stat[1]
NET_STATS.append((net_stat[0] - prev_net_info['in']) / SLEEP_TIME )
NET_STATS.append((net_stat[1] - prev_net_info['out']) / SLEEP_TIME )
prev_net_info['in'] = net_stat[0]
prev_net_info['out'] = net_stat[1]
return NET_STATS
def checkMem(self):
#the memory status file
MEM_FILE="/proc/meminfo"
#default status
MEM_STATUS={
"MemTotal":0,
"MemFree":0,
"Cached":0,
"SwapCached":0,
"Active":0,
"Inactive":0,
"Inact_dirty":0,
"Inact_clean":0,
"HighTotal":0,
"LowTotal":0,
"SwapTotal":0,
"SwapFree":0
}
try:
fd = file(MEM_FILE,"r")
mem_info_list = fd.readlines()
PATTERN = re.compile(r"^(\w+):\s*(\d+)\s*(\w+)") #e.g:MemTotal: 2061480 kB
for line in mem_info_list:
#DEBUG
res = PATTERN.match(line)
if res:
var_list = res.groups()
if MEM_STATUS.has_key(var_list[0]):
MEM_STATUS[var_list[0]] = var_list[1]
fd.seek(0)
finally:
fd.close()
return MEM_STATUS
def run(self):
while True:
self.runningMutex.acquire()
if not self.running:
self.runningMutex.release()
break
self.runningMutex.release()
cpuStatus = self.check_cpu()
diskStatus = self.check_disk()
netStatus = self.checkNet()
memStatus = self.checkMem()
#add those status to eventList
# print cpuStatus
# print memStatus
# print diskStatus
# print netStatus
self.eventListMutex.acquire()
while len(self.eventList) > 0:
del self.eventList[0]
self.eventList.append({"cpu":cpuStatus,"mem":memStatus,"disk":diskStatus,"net":netStatus}) #Changed!!! trasform the dictionary to string!!!
self.eventListMutex.release()
#Just for test
time.sleep(SLEEP_TIME)
if __name__ == '__main__':
monitor = SysMonitor('SysMonitor',[],threading.Lock())
monitor.start()
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