script for testing how much cost of creating thread

test-thread-cost.py

#!/usr/bin/env python3
# -*- mode: python; coding: utf-8 -*-

import datetime
import threading

def test(n, use_thread=None):
    if use_thread is None:
        use_thread = True
    
    for x in range(n):
        stop_event = threading.Event()
        
        func_result = {}
        def func(x):
            y = (2 ** (x * 10) % 1000)
            func_result['y'] = y
            
            in_func_delta = datetime.datetime.now() - begin_time
            print('*** x:{!r} y:{!r} use_thread:{!r} in_func_delta:{!r}***'.format(
                    x, y, use_thread, in_func_delta))
            
            stop_event.set()
        
        begin_time = datetime.datetime.now()
        if use_thread:
            thr = threading.Thread(target=func, args=(x,))
            thr.start()
        else:
            func(x)
        
        stop_event.wait()
        event_delta = datetime.datetime.now() - begin_time
        
        if use_thread:
            thr.join()
        join_delta = datetime.datetime.now() - begin_time
        
        print('*** x:{!r} y:{!r} use_thread:{!r} event_delta:{!r} ***'.format(
                x, func_result['y'], use_thread, event_delta))
        print('*** x:{!r} y:{!r} use_thread:{!r} join_delta:{!r} ***'.format(
                x, func_result['y'], use_thread, join_delta))
        
        print('--')

if __name__ == '__main__':
    test(10, use_thread=True)
    test(10, use_thread=False)
    test(10, use_thread=True)
    test(10, use_thread=False)
    
    legend_seconds = 0.9
    print('hint: {!r} seconds is {!r}'.format(
            legend_seconds, datetime.timedelta(seconds=legend_seconds)))