Python 3 Script to Build Realtime CPU & Memory Usage Monitor in Terminal Using psutil Library

Welcome folks today in this blog post we will be displaying realtime cpu & memory usage monitor in terminal using psutil library in python. All the full source code of the application is shown below.

Get Started

In order to get started you need to install the below library using the pip command as shown below

pip install psutil

After installing this you need to make an app.py file and copy paste the following code

app.py

import time
import psutil

while True:
    display_usage(psutil.cpu_percent(),psutil.virtual_memory().percent,30) 
    time.sleep(0.5)

import time

import psutil

while True:

display_usage(psutil.cpu_percent(),psutil.virtual_memory().percent,30)

time.sleep(0.5)

As you can see we are importing the psutil and time module at the very top and then we are using the infinite while loop to show the realtime cpu usage in command line. And for this we are calling the external function called display_usage() here we are passing threee arguments first one is the cpu usage percent and secondly we are passing the memory usage and thirdly we are passing the no of bars for the animation.

Now we need to define this function which will display the bar animation of realtime usage as shown below

def display_usage(cpu_usage,mem_usage,bars=50):
    cpu_percent = (cpu_usage/100.0) 
    cpu_bar = '▉' * int(cpu_percent*bars) + '-' * (bars - int(cpu_percent*bars)) 
    mem_percent = (mem_usage/100.0)     
    mem_bar = '▉' * int(mem_percent*bars) + '-' * (bars - int(mem_percent*bars)) 
    print(f"\r CPU Usage: | |{cpu_bar}| {cpu_usage:.2f}%",end="") 
    print(f" Mem Usage: | |{mem_bar}| {mem_usage:.2f}%",end="\r")

def display_usage(cpu_usage,mem_usage,bars=50):

cpu_percent = (cpu_usage/100.0)

cpu_bar = '▉' * int(cpu_percent*bars) + '-' * (bars - int(cpu_percent*bars))

mem_percent = (mem_usage/100.0)

mem_bar = '▉' * int(mem_percent*bars) + '-' * (bars - int(mem_percent*bars))

print(f"\r CPU Usage: | |{cpu_bar}| {cpu_usage:.2f}%",end="")

print(f" Mem Usage: | |{mem_bar}| {mem_usage:.2f}%",end="\r")

As you can see we are getting the cpu usage percentage by dividing the result by 100 and then we are constructing the animation bar for showing the animation and same thing we are doing for the memory usage also and lastly we are printing the bar animation which will contain the cpu usage and memory usage.