Small program to monitor CPU

Small program to monitor CPU using Python

In the computers we use every day, the CPU is working all the time. Who has paid attention to the utilization rate of the CPU? This time, I will share with you a small program to monitor the utilization rate of the CPU.

Python version: 3.5+

Related modules: matplotlib module, psutil module

Reference Code:

import matplotlib.pyplot as plt
import matplotlib.font_manager as font_manager
import psutil as p


POINTS = 300
fig, ax = plt.subplots()
ax.set_ylim([0, 100])
ax.set_xlim([0, POINTS])
ax.set_autoscale_on(False)
ax.set_xticks([])
ax.set_yticks(range(0, 101, 10))
ax.grid(True)
# 执行用户进程的时间百分比
user = [None] * POINTS
# 执行内核进程和中断的时间百分比
sys = [None] * POINTS
# CPU处于空闲状态的时间百分比
idle = [None] * POINTS
l_user, = ax.plot(range(POINTS), user, label='User %')
l_sys, = ax.plot(range(POINTS), sys, label='Sys %')
l_idle, = ax.plot(range(POINTS), idle, label='Idle %')
ax.legend(loc='upper center', ncol=4, prop=font_manager.FontProperties(size=10))
bg = fig.canvas.copy_from_bbox(ax.bbox)


def cpu_usage():
    t = p.cpu_times()
    return [t.user, t.system, t.idle]


before = cpu_usage()


def get_cpu_usage():
    global before
    now = cpu_usage()
    delta = [now[i] - before[i] for i in range(len(now))]
    total = sum(delta)
    before = now
    return [(100.0*dt)/(total+0.1) for dt in delta]


def OnTimer(ax):
    global user, sys, idle, bg
    tmp = get_cpu_usage()
    user = user[1:] + [tmp[0]]
    sys = sys[1:] + [tmp[1]]
    idle = idle[1:] + [tmp[2]]
    l_user.set_ydata(user)
    l_sys.set_ydata(sys)
    l_idle.set_ydata(idle)
    while True:
        try:
            ax.draw_artist(l_user)
            ax.draw_artist(l_sys)
            ax.draw_artist(l_idle)
            break
        except:
            pass
    ax.figure.canvas.draw()


def start_monitor():
    timer = fig.canvas.new_timer(interval=100)
    timer.add_callback(OnTimer, ax)
    timer.start()
    plt.show()

if __name__ == '__main__':
    start_monitor()

operation result

Reference program link

Link: https://pan.baidu.com/s/1jqzC77TTNRKMdAR_eBDFHA Password: 5tti