Add Windows64PGOTailcallBuild and Windows64PGONoGilTailcallBuild#667
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chris-eibl wants to merge 2 commits intopython:mainfrom
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Add Windows64PGOTailcallBuild and Windows64PGONoGilTailcallBuild#667chris-eibl wants to merge 2 commits intopython:mainfrom
chris-eibl wants to merge 2 commits intopython:mainfrom
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chris-eibl
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itamaro and
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itamaro
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Feb 21, 2026
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generally looks good!
I think worker capacity should be fine, but we'll find out after this lands. if we see capacity issues, maybe we can drop the 3.13 builds, since free-threading was experimental and we now have it supported in 3.14.
I don't think we can drop the non-tail-call builds for 3.14 and main, since these are the only buildbot debug builds we have for free-threading, given that tail-call on windows doesn't support debug.
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LG, thanks!
I will merge this after I finish investigating a test isolation issue on that windows worker
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@itamaro: I've created the new factories and used it for two new builders on your worker
itamaro-win64-srv-22-aws.If there is enough capacity, it would be fine to keep the the old builders, too, to have coverage for those configurations (which will be no longer released, though).
If there is not enough capacity, we'll have to clarify with @zooba whether we can ditch them or need to "find" a new worker.
I've put them into tier1, because that's what we're gonna release in the near future, and quoting Steve from our discord discussions
We only need this in the main branch, because MSVC tailcalling is not supported on the older branches. This is already ensured due to the
Windows PGOprefix of the new builders:I don't know whether this needs an issue here? Will create one if necessary.