[New-bugs-announce] [issue32047] asyncio: enable debug mode when -X dev is used

[STINNER Victor]

New submission from STINNER Victor <victor.stinner at gmail.com>:

The bpo-32043 added a new "developer mode" enabled with the new -X dev command line option.

I propose to enable asyncio debug mode with the global Python "developer mode".

If an asyncio application is correctly written, the single side effect of -X dev would be to log "Executing ... took ... seconds" if a handle took longer than 100 ms. Well, a handle should *not* take longer than 100 ms. So maybe it's ok to start logging such events in the "developer mode", no?


Example with attached block_loop.py script which blocks the event loop.

(1) This command doesn't display anything:

haypo at selma$ ./python block_loop.py 


(2) In developer mode, the warning a emitted to warn the developer about the bug:

$ ./python -X dev block_loop.py 
Executing <Task finished coro=<block_loop() done, defined at block_loop.py:4> result=None created at /home/haypo/prog/python/master/Lib/asyncio/base_events.py:444> took 1.002 seconds

----------
components: asyncio
files: block_loop.py
messages: 306353
nosy: haypo, yselivanov
priority: normal
severity: normal
status: open
title: asyncio: enable debug mode when -X dev is used
versions: Python 3.7
Added file: https://bugs.python.org/file47269/block_loop.py

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<https://bugs.python.org/issue32047>
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