Python aioredis中的这些发布/订阅方法是否等效？

似乎有两种方法可以进行发布/订阅：

使用channel.wait_message（）和channel.get（）

使用Receiver.iter（）

文档说等待新消息时wait_message（）被阻塞。我用一个修改过的aioredis示例做了一些测试，它们似乎都能工作，并且没有阻塞。它们相等吗？ 我需要在阅读器中添加一个小睡眠吗？如果没有，aioredis如何处理轮询频率

import asyncio
import aioredis
import random
from itertools import count


async def reader(ch):
    # while await ch.wait_message():
    #     msg = await ch.get_json()
    async for msg in ch.iter(encoding='utf-8'):
        print("Got Message:", msg)
        **# await asyncio.sleep(.1)  # is this necessary?**


async def sender(pub):
    while True:
        pub.publish_json('chan:1', ["Hello", "world"])
        await asyncio.sleep(random.randint(1, 5))


async def foo():
    while True:
        print('bar')
        await asyncio.sleep(random.random())


async def main():
    pub = await aioredis.create_redis(
        'redis://localhost')
    sub = await aioredis.create_redis(
        'redis://localhost')

    ch1, = await sub.subscribe('chan:1')
    tsk = asyncio.ensure_future(reader(ch1))
    tsk1 = asyncio.ensure_future(foo())
    tsk2 = asyncio.ensure_future(sender(pub))

    await foo()
    await sub.unsubscribe('chan:1')
    await tsk
    tsk1.cancel()
    await tsk1
    tsk2.cancel()
    await tsk2
    sub.close()
    pub.close()


if __name__ == '__main__':
    asyncio.get_event_loop().run_until_complete(main())

    try:
        pass
    except KeyboardInterrupt:
        for task in asyncio.all_tasks():
            task.cancel()