import asyncio
import perf


async def func():
    pass


loop = asyncio.get_event_loop()
coros = [func() for i in range(10000)]
def bench_ensure_future():
    for coro in coros:
        asyncio.ensure_future(coro, loop=loop)


runner = perf.Runner()
runner.bench_func('ensure_future', bench_ensure_future)