python how to overcome GIL

Ref: https://realpython.com/python-gil/

# single_threaded.py
import time
from threading import Thread

COUNT = 50000000

def countdown(n):
    while n>0:
        n -= 1

start = time.time()
countdown(COUNT)
end = time.time()

print('Time taken in seconds -', end - start)
#Time taken in seconds - 6.20024037361145


# multi_threaded.py
import time
from threading import Thread

COUNT = 50000000

def countdown(n):
    while n>0:
        n -= 1

t1 = Thread(target=countdown, args=(COUNT//2,))
t2 = Thread(target=countdown, args=(COUNT//2,))

start = time.time()
t1.start()
t2.start()
t1.join()
t2.join()
end = time.time()

print('Time taken in seconds -', end - start)
# Time taken in seconds - 6.924342632293701
# No improvement here due to GIL & due to sharing of lock & releases


# multi_processing.py
# Uses cores instead of threads
from multiprocessing import Pool
import time

COUNT = 50000000
def countdown(n):
    while n>0:
        n -= 1

if __name__ == '__main__':
    pool = Pool(processes=2)
    start = time.time()
    r1 = pool.apply_async(countdown, [COUNT//2])
    r2 = pool.apply_async(countdown, [COUNT//2])
    pool.close()
    pool.join()
    end = time.time()
    print('Time taken in seconds -', end - start)
    #Time taken in seconds - 4.060242414474487