⚡ Bolt: optimize CLI version lookup performance#94
⚡ Bolt: optimize CLI version lookup performance#94google-labs-jules[bot] wants to merge 2 commits into
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Replaced the default `click.version_option()` metadata lookup with a faster direct read from `pyproject.toml`. - Added `_get_version()` helper that uses regex to extract the version. - Bypasses `importlib.metadata.version()` which was adding ~80ms overhead. - Maintains `pyproject.toml` as the single source of truth for versioning. - Reduces `--version` startup time by ~43% (from ~166ms to ~95ms).
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| help="Say hello to a user.", | ||
| epilog="Example: app --name Alice", | ||
| ) | ||
| def _get_version() -> str: |
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Use uv to get project version instead
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I explored using uv version --short as an alternative. While it's easier to write, it introduces ~35ms of overhead compared to the ~0.5ms of the regex approach. More importantly, uv is not included in the production runtime stage of the Dockerfile for this project, so it wouldn't be available when the app is deployed in a container. The regex approach provides the best performance (~80ms faster than importlib.metadata) while keeping pyproject.toml as the single source of truth and maintaining compatibility with the production environment.
Improved CLI startup speed by reading version from pyproject.toml via regex. - Bypasses slow importlib.metadata.version() (~80ms saving). - Documented findings in .jules/bolt.md. - Maintained pyproject.toml as single source of truth.
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⚡ Bolt: optimize CLI version lookup performance
💡 What
Replaced the default
click.version_option()metadata lookup with a more efficient direct read frompyproject.tomlusing regex.🎯 Why
The default
click.version_option()(without a version string) callsimportlib.metadata.version(), which scans all installed package metadata on disk. In this environment, this operation was measured to take ~80ms, nearly doubling the startup time for simple flag checks like--version.📊 Impact
Expected performance improvement:
--versionstartup time: ~166ms → ~95ms (~43% faster)🔬 Measurement
Run
time .venv/bin/app --versionbefore and after the change.Verified using a benchmarking script (
bench.py) that ran 10 iterations:✅ Verification
mise run testpassed.ruff check .passed.app --versioncorrectly returns0.1.0.PR created automatically by Jules for task 8041694518241216923 started by @amrabed