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gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe)#145099

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clintonsteiner wants to merge 5 commits intopython:mainfrom
clintonsteiner:gh-145098
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gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe)#145099
clintonsteiner wants to merge 5 commits intopython:mainfrom
clintonsteiner:gh-145098

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@clintonsteiner clintonsteiner commented Feb 22, 2026 •
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hugovk reviewed Feb 22, 2026
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I'm curious if there's any performance difference between this and the previous one, can you compare times?

Also noting this image is still in beta but should be GA "around November" [2025], "before Xcode 26.3 releases" [20 Feb], "late February / early March, but depends on Xcode 26.4 behavior in general, so no promises".

actions/runner-images#13008

I don't see this as a blocker as long as everything we need is in there.

Misc/NEWS.d/next/Build/2026-02-22-12-00-00.gh-issue-145098.n7Qk2m.rst Outdated
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We don't need a NEWS file for CI changes, please can you remove it?

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@clintonsteiner clintonsteiner Feb 22, 2026

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Removed @hugovk seeing around 2.5 mins slower on pr run... I'm shocked, and didn't se this wasn't ga yet, just saw it using old mac os and since I had just tested on tahoe, figured the ci should match.

Thanks for the review! Removed news posting

@hugovk hugovk added skip news infra CI, GitHub Actions, buildbots, Dependabot, etc. labels Feb 22, 2026
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hugovk commented Feb 22, 2026

Job macos-14 (main) macos-26 (PR) Diff
build and test 8m 39s 12m 11s +3m 32s (+41%)
free-threading build and test 15m 58s 18m 25s +2m 27s (+15%)
Android (aarch64) 4m 09s 3m 34s -35s (-14%)
iOS 16m 29s 21m 34s +5m 05s (+31%)
JIT aarch64 (Debug) 15m 43s 15m 04s -39s (-4%)
JIT aarch64 (Release) 15m 36s 13m 09s -2m 27s (-16%)
tail-call aarch64 9m 54s 9m 45s -9s (-2%)

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