Severe performance degradation for tracing under 3.11

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#93,516 61 comments 3 reactions 1 assignee View on GitHub

@markshannon is already working on this.

Since Jul 3, 2022.

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Description

3.11 interpreter-core type-bug

Bug report

Coverage.py is seeing a significant increase in overhead for tracing code in 3.11 compared to 3.10: https://github.com/nedbat/coveragepy/issues/1287

As an example:

cov proj python3.10 python3.11 3.11 vs 3.10
none bug1339.py 0.184 s 0.142 s 76%
none bm_sudoku.py 10.789 s 9.901 s 91%
none bm_spectral_norm.py 14.305 s 9.185 s 64%
6.4.1 bug1339.py 0.450 s 0.854 s 189%
6.4.1 bm_sudoku.py 27.141 s 55.504 s 204%
6.4.1 bm_spectral_norm.py 36.793 s 67.970 s 184%

(This is the output of lab/benchmark.py.)

Your environment

  • CPython versions tested on: 3.10, 3.11
  • Operating system and architecture: MacOS, Intel
Linked PRs
  • gh-108028
Dominant language
Python
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