打开新线程 运行 请求和 aiohttp.ClientSession 异步 IO 之间的时间成本差异？

Time cost difference between opening a new thread to run requests and aiohttp.ClientSession for async IO?

我知道 aiohttp 支持异步 IO，所以它是完全单线程的。但是 run_in_executor 有点像开始了一个新线程。但是我测试了一个1000次下载的任务，似乎差别不大。但我认为 aiohttp 应该更快，因为线程成本。我是不是做错了什么？

async def get(url):
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as resp:
            print(url, resp.status)
            print(url, await resp.text())

loop = asyncio.get_event_loop()     
tasks = [                           
    get("http://www.google.com"),
    get("http://www.google.com")
]
loop.run_until_complete(asyncio.wait(tasks))    
loop.close() 




async def get_via_thread(url):
    loop = asyncio.get_event_loop()
    try:
        response = await loop.run_in_executor(None, functools.partial(requests.get, url=url))

But I tested for a task with 1000 downloads, it seems the difference is rather insignificant.

问题可能出在您的基准测试中。很难说具体在哪里，因为你没有提供一个来重现:)

例如，您可以查看 where OP tried to compare threads and coroutines and got no difference and ，其中解释了此结果并提供了修复。