[FIXED] Python - How to make use of multiple CPU cores

Issue

I know that Python programs execute as a single process using a single CPU.

Does this mean that opening 4 command prompts and launching, one after the other, 4 different .py scripts will result in making use of 4 CPU cores?

My system:

• Alienware Workstation - Intel(R) Core(TM) i7-7700K CPU @ 4.20 GHz
• Windows 10 Home Edition
• Python 2.7.15

Solution

In general, you're right: you'll use one CPU core with one python process. However, there are many ways which allow you to use more than one CPU core. Have a look at the official Python docs about multiprocessing.

This is an example, which will stress your CPU on all its cores:

from multiprocessing import Pool, cpu_count

def random_calculation(x):
    while True:
        x * x

p = Pool(processes=cpu_count())
p.map(random_calculation, range(cpu_count()))

Answered By - finefoot