bench.py

import asyncio
import time


WARMUP_RUNS = 5
BENCH_RUNS = 20

FACTOR = 200
num_tasks = 0


async def i5():
    await asyncio.sleep(0)
    await asyncio.sleep(0)
    await asyncio.sleep(0)

async def i4():
    global num_tasks
    for _ in range(FACTOR):
        num_tasks += 1
        await asyncio.create_task(i5())

async def i3():
    await asyncio.sleep(0)
    await i4()

async def i2():
    await asyncio.sleep(0)
    await i3()

async def i1():
    global num_tasks
    async with asyncio.TaskGroup() as g:
        for _ in range(FACTOR):
            g.create_task(i2())
            num_tasks += 1

for _ in range(WARMUP_RUNS):
    asyncio.run(i1())
    print('w', end='', flush=True)

started = time.monotonic()
for _ in range(BENCH_RUNS):
    asyncio.run(i1())
    print('b', end='', flush=True)
ended = time.monotonic()

print()

num_tasks //= (WARMUP_RUNS + BENCH_RUNS)
print(
    f'time={(ended - started) / BENCH_RUNS} '
    f'{num_tasks=}'
)

# normal:
#
# ~/d/p/cpython (main %) » ./python.exe bench.py
# wwwwwbbbbbbbbbbbbbbbbbbbb
# time=0.12399349374973098 num_tasks=40200
# ~/d/p/cpython (main %) » ./python.exe bench.py
# wwwwwbbbbbbbbbbbbbbbbbbbb
# time=0.12461646664960427 num_tasks=40200
# ~/d/p/cpython (main %) » ./python.exe bench.py
# wwwwwbbbbbbbbbbbbbbbbbbbb
# time=0.12489991874972475 num_tasks=40200

# stack:
#
# ~/d/p/cpython (stack %) » ./python.exe bench.py
# wwwwwbbbbbbbbbbbbbbbbbbbb
# time=0.12497415624966379 num_tasks=40200
# ~/d/p/cpython (stack %) » ./python.exe bench.py
# wwwwwbbbbbbbbbbbbbbbbbbbb
# time=0.12572984584985533 num_tasks=40200
# ~/d/p/cpython (stack %) » ./python.exe bench.py
# wwwwwbbbbbbbbbbbbbbbbbbbb
# time=0.1256675312499283 num_tasks=40200