Getting the figures of how much overhead implies having a Collector installed

test_task.py

import asyncio
import contextvars
import uvloop
from types import SimpleNamespace

asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())


N = 100000


class TaskCollector(uvloop.TracingCollector):
    ## Collector methods
    def task_created(self, task):
        pass

async def foo():
    return

async def main(loop):
    with uvloop.tracing(TaskCollector()):
        start = loop.time()
        for i in range(N):
            task = loop.create_task(foo())
        delta = loop.time() - start
        return delta


loop = asyncio.get_event_loop()
deltas = [loop.run_until_complete(main(loop)) for i in range(5)]
delta = min(deltas)
print(f"No tracing: Cost per {N} task {delta}, per task {delta/N}")