[issue31970] asyncio debug mode is very slow

[Antoine Pitrou]

New submission from Antoine Pitrou <pitrou at free.fr>:

Each time a new future, handle or task is created, asyncio with debug mode enabled will parse the whole call stack and create a StackSummary object for it.  Imagine a recursive coroutine: with N nested calls, you get O(N**2) performance.

Ideally debug mode wouldn't slow things too much, at least for development and testing setups.

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components: Library (Lib), asyncio
messages: 305752
nosy: giampaolo.rodola, haypo, pitrou, yselivanov
priority: normal
severity: normal
status: open
title: asyncio debug mode is very slow
type: behavior
versions: Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31970>
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