comparing_multi_and_one_thread.py

# one thread

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)




# multi_threaded.py
import time
from threading import Thread

COUNT = 50000000

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

t1 = Thread(target=countdown, args=(COUNT//2, 1))
t2 = Thread(target=countdown, args=(COUNT//2, 2))

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

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


# multiprocessing
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('[MP]Time taken in seconds -', end - start)