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Use PEP 669 Low Impact Monitoring to reduce overhead #1746
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sys.monitoring support is in coverage.py 7.4.0, though it only makes line coverage faster, not branch coverage. I'm still working on the support that will be faster for branch coverage. |
Awesome, thanks! I'll test |
Indeed |
Is your feature request related to a problem? Please describe.
coveragepy adds significant overhead to test execution in CI.
And this got much worse with Python 3.12 due to CPython performance regression (#1665, python/cpython#107674, maybe will be fixed by python/cpython#107841)
Describe the solution you'd like
PEP 669 – Low Impact Monitoring for CPython (
sys.monitoring
) should be explored to see if it claws back lost performance or even results in performance gains. Though AFAIK it is not proven yet whether it will help.Additional context
As I understand, this is already under development. But I wanted to open an issue anyway to track progress.
In #1665 (comment) (Oct 25, 2023) nedbat states:
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