from test.support import interpreters
import time
from threading import Thread

def countdown():
    for i in range(50000000):
      pass

t1 = Thread(target=countdown)
start = time.time()
t1.start()
t1.join()
end = time.time()
print('Time of a single thread -- GIL activated -- : ', end - start)
t1 = Thread(target=countdown)
t2 = Thread(target=countdown)
t3 = Thread(target=countdown)
start = time.time()
t1.start()
t2.start()
t3.start()
t1.join()
t2.join()
t3.join()
end = time.time()
print('Time of a three threads -- GIL activated -- : ', end - start)

script='''
for i in range(50000000):
    pass
'''
def countdown2():
    interp = interpreters.create()
    interp.run(script)

tt1 = Thread(target=countdown2)
start = time.time()
tt1.start()
tt1.join()
end = time.time()
print('Time of a single thread -- A Per-Interpreter GIL -- : ', end - start)

tt1 = Thread(target=countdown2)
tt2 = Thread(target=countdown2)
tt3 = Thread(target=countdown2)
start = time.time()
tt1.start()
tt2.start()
tt3.start()
tt1.join()
tt2.join()
tt3.join()
end = time.time()
print('Time of three threads -- A Per-Interpreter GIL -- : ', end - start)