import os
import time
import threading
import multiprocessing

NUM_WORKERS = 4

def run_numbers():
    print("PID: %s, Process Name: %s, Thread Name: %s" % (
        os.getpid(),
        multiprocessing.current_process().name,
        threading.current_thread().name)
    )
    x = 0
    while x < 10000000:
        x += 1

start_time = time.time()

for _ in range(NUM_WORKERS):
    run_numbers()

end_time = time.time()
 
print("Serial time=", end_time - start_time)
 

start_time = time.time()

threads = [threading.Thread(target=run_numbers) for _ in range(NUM_WORKERS)]
[thread.start() for thread in threads]
[thread.join() for thread in threads]

end_time = time.time()
 
print("Threads time=", end_time - start_time)
 
 
start_time = time.time()

processes = [multiprocessing.Process(target=run_numbers) for _ in range(NUM_WORKERS)]
[process.start() for process in processes]
[process.join() for process in processes]
end_time = time.time()

 
print("Parallel time=", end_time - start_time)