Multi processing in Python

multi-proc.py

# Testing of how multi processing works
# https://www.youtube.com/watch?v=ecKWiaHCEKs
"""
Multiprocessing:
- A new process is started independent from the first process
- Starting a process is slower than starting a thread
- Memory is not shared between processes
- Mutexes not necessary (unless threading in the new process)
- One GIL (Global Interpreter Lock) for each process
"""
# This makes all cpu cores run at 100%
from multiprocessing import Process
import os
import math


def calc(num):
    for i in range(0, 7000000):
        math.sqrt(i)


def main():
    processes = []

    for i in range(os.cpu_count()):
        print('Process: %d' % i)
        processes.append(Process(target=calc, args=(46560546845,)))

    for process in processes:
        process.start()

    for process in processes:
        process.join()

    print('\n\nDone!')


if __name__ == "__main__":
    main()