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Use faster APIs to calculate paths at startup for Store packaged Python on Windows#99345

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zooba merged 4 commits intopython:mainfromzooba:faststart
Nov 23, 2022

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zooba
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These APIs were added in Windows 8, so we can safely backport.

@zooba
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The rough testing I did showed about 50% reduction in startup time (~450ms->250ms) in non-ideal circumstances, but the Windows devs I was working with said it seemed right. The numbers were pretty stable.

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Okay, had to retract one of the major optimisations because it can be incorrect. That brings the improvement down to around 50ms, which is still worthwhile, but not as impressive.

However, users can at least override this perf impact by setting their ownPYTHONUSERBASE env variable before launching.

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It's possible we might be able to bring that optimisation back, looks like Windows covers the concerning edge cases for us. Still checking

@zoobazooba added DO-NOT-MERGE performancePerformance or resource usage labelsNov 10, 2022
@zoobazooba merged commit71a4a2d intopython:mainNov 23, 2022
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Thanks@zooba for the PR 🌮🎉.. I'm working now to backport this PR to: 3.10, 3.11.
🐍🍒⛏🤖

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GH-99733 is a backport of this pull request to the3.11 branch.

@bedevere-botbedevere-bot removed the needs backport to 3.11only security fixes labelNov 23, 2022
miss-islington pushed a commit to miss-islington/cpython that referenced this pull requestNov 23, 2022
…on on Windows (pythonGH-99345)(cherry picked from commit71a4a2d)Co-authored-by: Steve Dower <steve.dower@python.org>
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GH-99734 is a backport of this pull request to the3.10 branch.

@bedevere-botbedevere-bot removed the needs backport to 3.10only security fixes labelNov 23, 2022
miss-islington pushed a commit to miss-islington/cpython that referenced this pull requestNov 23, 2022
…on on Windows (pythonGH-99345)(cherry picked from commit71a4a2d)Co-authored-by: Steve Dower <steve.dower@python.org>
miss-islington added a commit that referenced this pull requestNov 23, 2022
…on on Windows (GH-99345)(cherry picked from commit71a4a2d)Co-authored-by: Steve Dower <steve.dower@python.org>
miss-islington added a commit that referenced this pull requestNov 23, 2022
…on on Windows (GH-99345)(cherry picked from commit71a4a2d)Co-authored-by: Steve Dower <steve.dower@python.org>
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