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alloctests: Don't run the longer partial-sort tests under Miri#150947

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alloctests: Don't run the longer partial-sort tests under Miri#150947
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Zalathar:partial-sort-miri

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@Zalathar

@Zalathar Zalathar commented Jan 11, 2026

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These tests take hours to run in Miri, which greatly increases the duration of the x86_64-gnu-aux job, as observed in #150900 (comment).

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jan 11, 2026
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r? @Mark-Simulacrum

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@Zalathar

Zalathar commented Jan 11, 2026

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@bors try jobs=x86_64-gnu-aux

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rust-bors Bot added a commit that referenced this pull request Jan 11, 2026
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Auto merge of #150947 - Zalathar:partial-sort-miri, r=<try>
5972e98 
alloctests: Don't run the longer partial-sort tests under Miri

try-job: x86_64-gnu-aux
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@Zalathar

Zalathar commented Jan 11, 2026

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r? tgross35

@rustbot rustbot assigned tgross35 and unassigned Mark-Simulacrum Jan 11, 2026
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tgross35 approved these changes Jan 11, 2026
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LGTM assuming this does enough to get the time back

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tisonkun
tisonkun approved these changes Jan 11, 2026
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Thank you!

I'm unfamiliar with miri how it can take hours to finish. Locally, it takes a few seconds to finish.

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@tgross35

tgross35 commented Jan 11, 2026

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I'm unfamiliar with miri how it can take hours to finish. Locally, it takes a few seconds to finish.

Do you mean running the tests in miri locally takes a few seconds? Or running them natively?

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tisonkun commented Jan 11, 2026

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I'm unfamiliar with miri how it can take hours to finish. Locally, it takes a few seconds to finish.

Do you mean running the tests in miri locally takes a few seconds? Or running them natively?

Nope. Natively.

How can I run tests in miri locally?

@Zalathar

Zalathar commented Jan 11, 2026

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How can I run tests in miri locally?

You should be able to do ./x miri library/alloc to run the tests in Miri locally.

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tgross35 commented Jan 11, 2026

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For context, Miri tends to be kind of slow for any sort of high iteration or high allocation testing; it doesn't benefit from optimizations (except maybe MIR opts? I'm not sure). Since the sorting algorithm can be up to $O(n^2)$, that adds up quick.

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☀️ Try build successful (CI)
Build commit: 5972e98 (5972e9802f9f1a662806499dbdfec420497a1eac, parent: f57eac1bf98cb5d578e3364b64365ec398c137df)

@Zalathar

Zalathar commented Jan 11, 2026

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@bors r=tgross35 rollup p=1

This should reduce CI times by about ~1 hour.

@rust-bors rust-bors Bot added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Jan 11, 2026
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📌 Commit 5081393 has been approved by tgross35

It is now in the queue for this repository.

@rust-bors rust-bors Bot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jan 11, 2026
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Auto merge of #150951 - Zalathar:rollup-xhWLriD, r=Zalathar
9bc8b40 
Rollup of 12 pull requests

Successful merges:

 - #150947 (alloctests: Don't run the longer partial-sort tests under Miri)
 - #148196 (Implement create_dir_all() to operate iteratively instead of recursively)
 - #150494 ( Fix dso_local for external statics with linkage)
 - #150788 (THIR patterns: Replace `AscribeUserType` and `ExpandedConstant` wrappers with per-node data)
 - #150799 (Fix ICE: can't type-check body of DefId  for issue #148729)
 - #150804 (Remove std_detect_file_io and std_detect_dlsym_getauxval features)
 - #150852 (std: sys: fs: uefi: Implement File::write)
 - #150871 (Use f64 NaN in documentation instead of sqrt(-1.0))
 - #150878 (Emit an error for linking staticlibs on BPF)
 - #150911 (Add missing documentation for globs feature)
 - #150913 (compiler: Forward attributes to eii-expanded macros)
 - #150916 (Once again, reorganize the EII tests a bit)

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@Zalathar

Zalathar commented Jan 11, 2026

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With these changes, the offending test should now take 20 seconds instead of 1.5 hours:

2026-01-11T02:25:07.4764420Z test sort::partial::basic_impl ... ok
2026-01-11T02:25:27.5141644Z test sort::partial::random_patterns ... ok

@rust-bors rust-bors Bot merged commit c680b74 into rust-lang:main Jan 11, 2026
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@rustbot rustbot added this to the 1.94.0 milestone Jan 11, 2026
@Zalathar Zalathar deleted the partial-sort-miri branch January 11, 2026 06:48
rust-timer added a commit that referenced this pull request Jan 11, 2026
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Unrolled build for #150947
f64bfa2 
Rollup merge of #150947 - partial-sort-miri, r=tgross35

alloctests: Don't run the longer partial-sort tests under Miri

These tests take hours to run in Miri, which greatly increases the duration of the `x86_64-gnu-aux` job, as observed in #150900 (comment).

- [Zulip thread in #t-infra](https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/x86_64-gnu-aux.20job.20went.20from.20~2.20to.20~3.2E5.20hours/near/567354541)
@RalfJung

RalfJung commented Jan 11, 2026

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With miri being 4-5 orders of magnitude slower than native execution, "a few seconds native" and "a few hours in Miri" is exactly what I would expect.

@github-actions github-actions Bot mentioned this pull request Jan 27, 2026
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