Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs by jieyouxu · Pull Request #160415 · rust-lang/rust

jieyouxu · 2026-08-03T05:29:49Z

Summary

The aarch64 macos runners seem to be consistently among the slowest jobs, sometimes pushing our overall CI time to 4 hours on a bad run. Let's try to split the jobs to keep the overall Merge CI time manageable:

aarch64-apple => aarch64-apple-{1,2}
aarch64-apple-macos-26 => aarch64-apple-macos-26-{1,2}

Discussed in #t-infra > GHA macos-26 slowness @ 💬.

Some imprecise stats

Looking at CI dashboard over past month (as of 2026-08-03):

Job	Median	P95	Run counts
aarch64-apple	2.94 hr	3.59 hr	156
aarch64-apple-macos-26	3.12 hr	3.59 hr	148

The median seems okay, the macos-26 job is on par median wise with i686-msvc-1 and dist-x86_64-linux. It's the P95 that's more concerning, since i686-msvc-1 P95 is the second-worst at 3.25 hr.

r? infra-ci

try-job: aarch64-apple*

…` jobs The aarch64 macos runners seem to be consistently among the slowest jobs, sometimes pushing our overall CI time to 4 hours on a bad run. Let's try to split the jobs to keep the overall Merge CI time manageable: * `aarch64-apple` => `aarch64-apple-{1,2}` * `aarch64-apple-macos-26` => `aarch64-apple-macos-26-{1,2}`

jieyouxu · 2026-08-03T05:30:03Z

@bors try

Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs try-job: `aarch64-apple*`

rust-bors · 2026-08-03T08:29:30Z

☀️ Try build successful (CI)
Build commit: cf50e9d (cf50e9d7a485bc024ce3c621727535c1670f0cc2)
Base parent: 22057b8 (22057b88b091743bc0fd8d592a9264f0a6951403)

jieyouxu · 2026-08-03T08:30:57Z

Not exactly fast, but more acceptable than like 4 hours on some less lucky runs.

jieyouxu · 2026-08-03T08:31:07Z

@bors try

Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs try-job: `aarch64-apple*`

rust-bors · 2026-08-03T10:59:41Z

☀️ Try build successful (CI)
Build commit: 6641f46 (6641f46e66e09d708c69928bc8ab94858f439da2)
Base parent: 65dd30f (65dd30fb9e882a7e8f0be10caca62936db2a98b8)

jieyouxu · 2026-08-03T13:38:54Z

r? infra-ci

teor2345

I'm not super familiar with the details here, but I checked the job split is consistent with the existing shell script files, and there aren't any unexpected changes.

View changes since this review

Mark-Simulacrum

@bors r+

View changes since this review

rust-bors · 2026-08-06T02:10:33Z

📌 Commit bdbfee0 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

…, r=Mark-Simulacrum Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs ## Summary The aarch64 macos runners seem to be consistently among the slowest jobs, sometimes pushing our overall CI time to 4 hours on a bad run. Let's try to split the jobs to keep the overall Merge CI time manageable: * `aarch64-apple` => `aarch64-apple-{1,2}` * `aarch64-apple-macos-26` => `aarch64-apple-macos-26-{1,2}` Discussed in [#t-infra > GHA macos-26 slowness @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/GHA.20macos-26.20slowness/near/613771526). ### Some imprecise stats Looking at [CI dashboard](https://p.datadoghq.com/sb/3a172e20-e9e1-11ed-80e3-da7ad0900002-b5f7bb7e08b664a06b08527da85f7e30?fromUser=true&refresh_mode=sliding&tpl_var_branch_name%5B0%5D=automation%2Fbors%2Fauto&tpl_var_env%5B0%5D=%2A&tpl_var_is_default_branch%5B0%5D=%2A&tpl_var_pipeline_name%5B0%5D=CI&tpl_var_provider_instance%5B0%5D=%2A&tpl_var_provider_name%5B0%5D=github&from_ts=1783056725849&to_ts=1785735125849&live=true) over past month (as of 2026-08-03): | Job | Median | P95 | Run counts | |------------------------|---------:|---------:|-----------:| | aarch64-apple | 2.94 hr | 3.59 hr | 156 | | aarch64-apple-macos-26 | 3.12 hr | 3.59 hr | 148 | The median seems *okay*, the `macos-26` job is on par median wise with `i686-msvc-1` and `dist-x86_64-linux`. It's the P95 that's more concerning, since `i686-msvc-1` P95 is the second-worst at `3.25` hr. r? infra-ci --- try-job: `aarch64-apple*`

…uwer Rollup of 17 pull requests Successful merges: - #159530 (Cap socket send length to c_int::MAX on Apple targets) - #159506 (Allow associated const equality constraints with GCA) - #160006 (Account for desugaring in method call move errors) - #160415 (Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs) - #160464 (fix: Check the fallback map before queueing child in `visible_parent_map` breadth-first search) - #160555 (Split `apply_primary_terminator_effect`) - #160592 (Suggest if-let chain continuation on unclosed delimiter) - #160600 (Avoid the std DLL copy alongside rustc) - #160156 (check_consts: exhaustively match on CastKind) - #160211 (Rename `#[unroll]` => `#[rustc_unroll]` to mitigate nameres ambiguity) - #160304 (Add tests for fixed new solver issues) - #160398 (rustc_abi: Add `LayoutData::is_variant_uninhabited` method) - #160546 (Update error message in documentation comments) - #160568 (Use `VisitorResult` helper macros) - #160571 (Add regression test for array type recovery in generic arguments) - #160588 (add a test showing polonius alpha is not a subset of datalog polonius) - #160617 (Add a suggestion to MissingUnsafeOnExtern diagnostic)

Rollup merge of #160415 - jieyouxu:jieyouxu/ci/macos-fission, r=Mark-Simulacrum Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs ## Summary The aarch64 macos runners seem to be consistently among the slowest jobs, sometimes pushing our overall CI time to 4 hours on a bad run. Let's try to split the jobs to keep the overall Merge CI time manageable: * `aarch64-apple` => `aarch64-apple-{1,2}` * `aarch64-apple-macos-26` => `aarch64-apple-macos-26-{1,2}` Discussed in [#t-infra > GHA macos-26 slowness @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/GHA.20macos-26.20slowness/near/613771526). ### Some imprecise stats Looking at [CI dashboard](https://p.datadoghq.com/sb/3a172e20-e9e1-11ed-80e3-da7ad0900002-b5f7bb7e08b664a06b08527da85f7e30?fromUser=true&refresh_mode=sliding&tpl_var_branch_name%5B0%5D=automation%2Fbors%2Fauto&tpl_var_env%5B0%5D=%2A&tpl_var_is_default_branch%5B0%5D=%2A&tpl_var_pipeline_name%5B0%5D=CI&tpl_var_provider_instance%5B0%5D=%2A&tpl_var_provider_name%5B0%5D=github&from_ts=1783056725849&to_ts=1785735125849&live=true) over past month (as of 2026-08-03): | Job | Median | P95 | Run counts | |------------------------|---------:|---------:|-----------:| | aarch64-apple | 2.94 hr | 3.59 hr | 156 | | aarch64-apple-macos-26 | 3.12 hr | 3.59 hr | 148 | The median seems *okay*, the `macos-26` job is on par median wise with `i686-msvc-1` and `dist-x86_64-linux`. It's the P95 that's more concerning, since `i686-msvc-1` P95 is the second-worst at `3.25` hr. r? infra-ci --- try-job: `aarch64-apple*`

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rust-bors Bot pushed a commit that referenced this pull request Aug 3, 2026

Auto merge of #160415 - jieyouxu:jieyouxu/ci/macos-fission, r=<try>

cf50e9d

Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs try-job: `aarch64-apple*`

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rust-bors Bot pushed a commit that referenced this pull request Aug 3, 2026

Auto merge of #160415 - jieyouxu:jieyouxu/ci/macos-fission, r=<try>

6641f46

Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs try-job: `aarch64-apple*`

rustbot assigned jdno Aug 3, 2026

jieyouxu marked this pull request as ready for review August 3, 2026 13:38

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Aug 3, 2026

rustbot assigned Mark-Simulacrum and unassigned jdno Aug 3, 2026

teor2345 approved these changes Aug 5, 2026

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Mark-Simulacrum approved these changes Aug 6, 2026

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rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 6, 2026

jhpratt mentioned this pull request Aug 6, 2026

Rollup of 7 pull requests #160601

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JonathanBrouwer mentioned this pull request Aug 6, 2026

Rollup of 13 pull requests #160609

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JonathanBrouwer mentioned this pull request Aug 6, 2026

Rollup of 13 pull requests #160610

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JonathanBrouwer mentioned this pull request Aug 6, 2026

Rollup of 17 pull requests #160615

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This was referenced Aug 6, 2026

Rollup of 16 pull requests #160623

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Rollup of 17 pull requests #160627

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rust-bors Bot merged commit 5c531f0 into rust-lang:main Aug 6, 2026
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rustbot added this to the 1.99.0 milestone Aug 6, 2026

jieyouxu deleted the jieyouxu/ci/macos-fission branch August 7, 2026 01:27

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Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs - #160415

Split `aarch64-apple{,-macos-26}` => `aarch64-apple{,-macos-26}-{1,2}` jobs#160415
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