Speed up case sensitive is-file check in file system cache - #10093
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This speeds up resolving imports somewhat. Add fast paths to `isfile_case`. On Linux we skip all logic, since the file system is almost always case sensitive. Cache results of parent directories as well. Add tests.
ilevkivskyi
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Feb 15, 2021
| self.make_file('bar.py') | ||
| self.make_file('pkg/sub_package/__init__.py') | ||
| self.make_file('pkg/sub_package/foo.py') | ||
| # Run twice to test bost cached and non-cached code paths. |
| assert self.isfile_case('pkg/sub_package/__init__.py') | ||
| assert self.isfile_case('pkg/sub_package/foo.py') | ||
| assert not self.isfile_case('non_existent.py') | ||
| assert not self.isfile_case('pkg/non_existent.py') |
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Maybe add a third test case where you check the two intermingled? For example:
- cold case-sensitive
- cold case-insensitive
- warm case-sensitive
- warm case-insensitive
| self.make_file('bar.py') | ||
| self.make_file('pkg/sub_package/__init__.py') | ||
| self.make_file('pkg/sub_package/foo.py') | ||
| # Run twice to test bost cached and non-cached code paths. |
hauntsaninja
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Dec 10, 2021
Originally added in python#10093 Fixes python#11690, fixes python#10661, fixes python#10822
JukkaL
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Dec 13, 2021
tushar-deepsource
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Jan 20, 2022
Originally added in python#10093 Fixes python#11690, fixes python#10661, fixes python#10822 Co-authored-by: hauntsaninja <>
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This speeds up resolving imports somewhat.
Add fast paths to
isfile_case. On Linux we skip all logic, sincethe file system is almost always case sensitive.
Cache results of parent directories as well.
Add tests.