使用python定时采样linux cpu占用率

# -*- coding: utf-8 -*-

import threading, time

class GetCpuInfo(threading.Thread):
def __init__(self, interval_time):
threading.Thread.__init__(self)
self.alive = True
self.cpuinfo_list = []
self._interval_time = interval_time

def get_cpu_useage(self):
'''读取stat，计算用户cpu占用率'''
_cpu_info = {}
with open("/proc/stat") as f:
lines = f.readlines()

for line in lines:
if line.strip() == "":
continue
cpu_values = line.split(' ')
values = [i for i in cpu_values if i.strip() != ""]
if values[0].strip() != "cpu":
continue
# totalCpuTime = user + nice + system + idle + iowait + irq +
# softirq + stealstolen  +  guest
# values中余下9个对应上述值
_cpu_info["totalCpuTime"] = 0
for i in range(1, 9):
_cpu_info["totalCpuTime"] += int(values[i].strip())

_cpu_info["userCpuTime"] = 0
for i in range(1, 3):
_cpu_info["userCpuTime"] += int(values[i].strip())
break
return _cpu_info

def run(self):
while self.alive:
time.sleep(self._interval_time)
cpu_info = self.get_cpu_useage()
# 计算cpu占用率
if cpu_info != {}:
cpu_usage = cpu_info["userCpuTime"] * 100 / cpu_info["totalCpuTime"]
self.cpuinfo_list.append(cpu_usage)

def stop_task(self):
self.alive = False

def get_cpuinfo(self):
return self.cpuinfo_list

if __name__ == "__main__":
# 每2秒采样一次
cpu = GetCpuInfo(2)
cpu.start()
time.sleep(10)
cpu.stop_task()
print cpu.get_cpuinfo()