gh-144384: Improve _colorize performance by replacing dataclass with regular class#144879
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hugovk wants to merge 2 commits into
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gh-144384: Improve _colorize performance by replacing dataclass with regular class#144879hugovk wants to merge 2 commits intopython:mainpython/cpython:mainfrom hugovk:3.15-colorize-performancehugovk/cpython:3.15-colorize-performanceCopy head branch name to clipboard
_colorize performance by replacing dataclass with regular class#144879hugovk wants to merge 2 commits into
python:mainpython/cpython:mainfrom
hugovk:3.15-colorize-performancehugovk/cpython:3.15-colorize-performanceCopy head branch name to clipboard
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Marked with DO-NOT-MERGE as this approach isn't agreed upon at this point. |
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Closing. We can make the diff smaller by keeping the Mapping, but the better approach is to make dataclasses faster. Let's continue in the isssue. |
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_colorizeconstructs six different theme classes (and I expect more in the future), which are slow to build because they use dataclasses.This makes the module as a whole slow to import, even the importer doesn't use a theme or doesn't use colour in the end.
If we switch to regular classes, the construction time is much faster. This PR also avoid the
collections.abcimport.tracebackBelow are import times for a macOS build with optimisations.
before: 15 ms
after: 6 ms
_colorizebefore: 13 ms
after: ~0 ms
_colorizemodule is slow to import, affectingtracebackandloggingmodules #144384