python - 线程模块的引用未被 gc 删除

Question

我找到了gc不会删除从 Threading.thread() 创建的对象.

# print memory status every 5sec
def trace_memory():
    while True:
        time.sleep(5)
        print(mem_top())

# just print and end
def test_thread():
    print('thread')

threading.Thread(target=trace_memory).start()

curr_count = 0
max_count = 10000
while max_count > curr_count:
    threading.Thread(target=test_thread).start()
    curr_count += 1

以下是 mem_top() 的结果:

refs:
10001   <class 'list'> [<unlocked _thread.lock object at 0x00000204DD680030>, <unlocked _thread.lock object at 0x00000204DD

bytes:
90120    [<unlocked _thread.lock object at 0x00000204DD680030>, <unlocked _thread.lock object at 0x00000204DD

我创建了 10000 ( test_thread() ) + 1 ( trace_memory() ) 线程和全部 test_thread()完成了。
但是 refs:, bytes: 表明线程仍然被某些东西引用。
如何制作 gc删除它们？

Answer 1

您需要在最后停止线程:

import threading, time, mem_top, gc


def trace_memory():
    while True:
        time.sleep(5)
        print(mem_top.mem_top())

# just print and end
def test_thread():
    print('thread')


def main():
    threading.Thread(target=trace_memory).start()

    curr_count = 0
    max_count = 1000
    threads = []
    while max_count > curr_count:
        thread = threading.Thread(target=test_thread)
        thread.start()
        threads.append(thread)
        curr_count += 1

    for thread in threads:
        thread.join()


main()