option to get v1.0 behaviour for coroutines

[p4l1ly]

The v1.0 behaviour for coroutines was actually useful to detect incorrect use of non-asyncio I/O calls which block the loop but not CPU. It might be convenient to add an option to switch to the old behaviour (if it is not a big deal). Of course, using the old version of yappi is still an option for users but not as elegant as would be a switch.

[p4l1ly]

Using the version 1.0 of yappi, the following simple example conveniently shows 0.5s of time when the event loop is blocked by main, spawn_blocking_sleep and blocking_sleep. (But I don't understand why 0.5s is not in the tsub of blocking_sleep since time.sleep is not in the list). But the current version of yappi would show 1.6s in main and 0.6s in spawn_blocking_sleep, which sums up the awaiting time with the blocking time and thus does not indicate the presence of incorrect sleep.

import asyncio
import time
import yappi

def blocking_sleep():
    time.sleep(0.5)

async def spawn_blocking_sleep():
    await asyncio.sleep(0.1)
    blocking_sleep()

async def main():
    await spawn_blocking_sleep()
    await asyncio.sleep(1)

yappi.stop()
yappi.clear_stats()
yappi.set_clock_type("WALL")
yappi.start()
asyncio.run(main())
yappi.get_func_stats().print_all(
    columns={0: ("name", 100), 1: ("ncall", 10), 2: ("tsub", 10), 3: ("ttot", 10), 4: ("tavg", 10)},
)

Clock type: WALL
Ordered by: totaltime, desc

name                                                                                                  ncall       tsub        ttot        tavg
/home/paly/.pyenv/versions/3.8.6/lib/python3.8/asyncio/runners.py:8 run                               1           0.000075    1.604799    1.604799
../versions/3.8.6/lib/python3.8/asyncio/base_events.py:580 _UnixSelectorEventLoop.run_until_complete  2           0.000111    1.603679    0.801839
../.pyenv/versions/3.8.6/lib/python3.8/asyncio/base_events.py:557 _UnixSelectorEventLoop.run_forever  2           0.000096    1.603399    0.801700
..y/.pyenv/versions/3.8.6/lib/python3.8/asyncio/base_events.py:1784 _UnixSelectorEventLoop._run_once  8           0.000408    1.603237    0.200405
/home/paly/.pyenv/versions/3.8.6/lib/python3.8/selectors.py:451 EpollSelector.select                  8           0.000111    1.101044    0.137630
/home/paly/.pyenv/versions/3.8.6/lib/python3.8/asyncio/events.py:79 Handle._run                       8           0.000074    0.501648    0.062706
aioblock.py:12 main                                                                                   3           0.000050    0.501080    0.167027
aioblock.py:8 spawn_blocking_sleep                                                                    2           0.000023    0.500832    0.250416
aioblock.py:5 blocking_sleep                                                                          1           0.000018    0.500661    0.500661
..me/paly/.pyenv/versions/3.8.6/lib/python3.8/asyncio/unix_events.py:57 _UnixSelectorEventLoop.close  1           0.000028    0.000560    0.000560
..aly/.pyenv/versions/3.8.6/lib/python3.8/asyncio/selector_events.py:87 _UnixSelectorEventLoop.close  1           0.000096    0.000530    0.000530
..versions/3.8.6/lib/python3.8/asyncio/selector_events.py:98 _UnixSelectorEventLoop._close_self_pipe  1           0.000069    0.000353    0.000353
etc.