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Thu Jun 14 18:31:12 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-June/153899.html

On Thu, Jun 14, 2018 at 10:03 PM Steve Dower <steve.dower at python.org> wrote:

> I often use
> semaphores for this when I need it, and it looks like
> asyncio.Semaphore() is sufficient for this:
>
>
> import asyncio
> task_limiter = asyncio.Semaphore(4)
>
> async def my_task():
>      await task_limiter.acquire()
>      try:
>          await do_db_request()
>      finally:
>          task_limiter.release()

Yeah, a semaphore logically fits exactly but

* I feel this API is somewhat clunky, even if you use an 'async with'.

* my gut feeling is spawning a thousand tasks and having them all fighting
over the same semaphore and scheduling is going to be much less efficient
than a small number of tasks draining a queue.
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[Python-Dev] A more flexible task creation