《再谈Python的GIL》测试用例

from threading import Thread from threading import Event as TEvent from multiprocessing import Process from multiprocessing import Event as PEvent import utility from timeit import Timer def countdown(n,event): for i in range(100): utility.countdown(n) event.set() def io_op(n,event): f = open('test.txt','w') while not event.is_set(): f.write('hello,world') f.close() def t1(): COUNT=100000000 event = TEvent() thread1 = Thread(target=countdown,args=(COUNT,event)) thread1.start() thread1.join() def t2(): COUNT=100000000 event = TEvent() thread1 = Thread(target=countdown,args=(COUNT//2,event)) thread2 = Thread(target=countdown,args=(COUNT//2,event)) thread1.start(); thread2.start() thread1.join(); thread2.join() def t3(): COUNT=100000000 event = PEvent() p1 = Process(target=countdown,args=(COUNT//2,event)) p2 = Process(target=countdown,args=(COUNT//2,event)) p1.start(); p2.start() p1.join(); p2.join() def t4(): COUNT=100000000 event = TEvent() thread1 = Thread(target=countdown,args=(COUNT,event)) thread2 = Thread(target=io_op,args=(COUNT,event)) thread1.start(); thread2.start() thread1.join(); thread2.join() def t5(): COUNT=100000000 event = PEvent() p1 = Process(target=countdown,args=(COUNT,event)) p2 = Process(target=io_op,args=(COUNT,event)) p1.start(); p2.start() p1.join(); p2.join() if __name__ == '__main__': t = Timer(t1) print('countdown in one thread:%f'%(t.timeit(1),)) t = Timer(t2) print('countdown use two thread:%f'%(t.timeit(1),)) t = Timer(t3) print('countdown use two Process:%f'%(t.timeit(1),)) t = Timer(t4) print('countdown in one thread with io op in another thread:%f'%(t.timeit(1),)) t = Timer(t5) print('countdown in one process with io op in another process:%f'%(t.timeit(1),))