thtreads_and_joins

"""
python3 -m pip install memory_profiler

cmd: python3 -m memory_profiler test.py
"""

import time
from threading import Thread

@profile
def test(heavy):

    time.sleep(1)

    def test(number, heavy = False):
        print('test thread number %s' % number)
        if heavy: buf = [2**number for i in range(2**number)]
        else:     buf = [2* number for i in range(2* number)]
        time.sleep(1)

    tasks = []
    for number in range(1, 21):
        task = Thread(target = test, args = (number, heavy))
        tasks.append(task)

    time.sleep(1)

    for task in tasks: task.start()

    time.sleep(1)

    for task in tasks: task.join()

    time.sleep(1)

@profile
def test_heavy():
    time.sleep(1)
    test(heavy = True)
    time.sleep(1)

@profile
def test_light():
    for i in range(100):
        test(heavy = False)

if __name__ == '__main__':

    print('start testing')
    time.sleep(1)

    # uncoment for 1 test - little theads, but heavy
    test_heavy()

    # uncoment for 2 test - many threads, but light
    #test_light()

    time.sleep(1)
    print('done')