resolve: Avoid finalizing extern prelude entries more than once #144737

petrochenkov · 2025-07-31T14:24:04Z

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rustbot · 2025-07-31T14:24:09Z

rustbot has assigned @fee1-dead.
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petrochenkov · 2025-07-31T14:24:29Z

@bors2 try @rust-timer queue

[WIP] resolve: Better caching for unsuccessful crate resolutions

rust-bors · 2025-07-31T14:24:34Z

⌛ Trying commit 3d03332 with merge f9cf5ef…

To cancel the try build, run the command @bors try cancel.

rust-bors · 2025-07-31T16:38:25Z

☀️ Try build successful (CI)
Build commit: f9cf5ef (f9cf5ef36ff11c909b0400242dad9298aee6de82, parent: 64ca23b6235732fa61c0a2b957c5d7e591e7c972)

rust-timer · 2025-07-31T17:48:06Z

Finished benchmarking commit (f9cf5ef): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (secondary 1.9%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	4.1%	[3.7%, 4.4%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.5%	[-2.5%, -2.5%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 4.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	7.3%	[3.6%, 10.9%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.2%	[-2.2%, -2.2%]	1
All ❌✅ (primary)	-	-	0

Binary size

Results (secondary 0.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.0%	[0.0%, 0.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Bootstrap: 467.836s -> 469.081s (0.27%)
Artifact size: 376.81 MiB -> 376.82 MiB (0.00%)

petrochenkov · 2025-07-31T17:53:54Z

@bors2 try @rust-timer queue

rust-bors · 2025-07-31T17:53:58Z

⌛ Trying commit 8f0d729 with merge b757ae7…

To cancel the try build, run the command @bors try cancel.

[WIP] resolve: Better caching for unsuccessful crate resolutions

rust-bors · 2025-07-31T20:09:03Z

☀️ Try build successful (CI)
Build commit: b757ae7 (b757ae7fff3f4bb8eafd4f24581e2cb971601fd7, parent: 3fb1b53a9dbfcdf37a4b67d35cde373316829930)

rust-timer · 2025-07-31T21:27:18Z

Finished benchmarking commit (b757ae7): comparison URL.

Overall result: ✅ improvements - no action needed

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.1%	[-2.0%, -0.4%]	8
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (secondary 3.6%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.6%	[3.6%, 3.6%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary -0.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	8.0%	[8.0%, 8.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.0%	[-3.3%, -2.7%]	3
All ❌✅ (primary)	-	-	0

Binary size

Results (secondary 0.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.0%	[0.0%, 0.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Bootstrap: 467.851s -> 468.346s (0.11%)
Artifact size: 376.84 MiB -> 376.80 MiB (-0.01%)

petrochenkov · 2025-07-31T22:23:39Z

I'll rebase this after #146004 is merged.
@rustbot blocked

resolve: Cleanups and micro-optimizations to extern prelude This is what can be done without changing the structure of `ExternPreludeEntry`, like in rust-lang#144737. See individual commits for details.

Rollup merge of #144746 - petrochenkov:extpreltidy, r=b-naber resolve: Cleanups and micro-optimizations to extern prelude This is what can be done without changing the structure of `ExternPreludeEntry`, like in #144737. See individual commits for details.

resolve: Cleanups and micro-optimizations to extern prelude This is what can be done without changing the structure of `ExternPreludeEntry`, like in rust-lang/rust#144737. See individual commits for details.

petrochenkov · 2025-09-02T13:23:22Z

@bors2 try @rust-timer queue

resolve: Avoid finalizing extern prelude entries more than once

rust-bors · 2025-09-02T15:39:32Z

☀️ Try build successful (CI)
Build commit: 5c18da3 (5c18da3dd7b32e5f8cabc1dc00f8fc55777c447f, parent: f6df223ea8c0017e64ce19c99afa32c0c629142c)

rust-timer · 2025-09-02T16:49:44Z

Finished benchmarking commit (5c18da3): comparison URL.

Overall result: ❌✅ regressions and improvements - please read the text below

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @rustbot label: +perf-regression-triaged. If not, please fix the regressions and do another perf run. If its results are neutral or positive, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.1%	[0.1%, 0.1%]	1
Improvements ✅ (primary)	-0.1%	[-0.1%, -0.1%]	4
Improvements ✅ (secondary)	-1.5%	[-3.1%, -0.0%]	9
All ❌✅ (primary)	-0.1%	[-0.1%, -0.1%]	4

Max RSS (memory usage)

Results (primary -1.6%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-1.6%	[-1.6%, -1.6%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-1.6%	[-1.6%, -1.6%]	1

Cycles

Results (secondary -1.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.8%	[2.8%, 2.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.4%	[-2.9%, -2.1%]	3
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 467.107s -> 467.044s (-0.01%)
Artifact size: 388.34 MiB -> 388.41 MiB (0.02%)

petrochenkov · 2025-09-02T16:55:31Z

@rustbot ready

fee1-dead · 2025-09-03T01:45:51Z

r? compiler

davidtwco · 2025-09-04T21:35:21Z

@bors r+

bors · 2025-09-04T21:35:24Z

📌 Commit 235dfba has been approved by davidtwco

It is now in the queue for this repository.

bors · 2025-09-05T05:50:27Z

⌛ Testing commit 235dfba with merge ad85bc5...

bors · 2025-09-05T09:00:56Z

☀️ Test successful - checks-actions
Approved by: davidtwco
Pushing ad85bc5 to master...

github-actions · 2025-09-05T09:03:47Z

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing 91edc3e (parent) -> ad85bc5 (this PR)

Test differences

Show 4 test diffs

4 doctest diffs were found. These are ignored, as they are noisy.

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard ad85bc524b1ad696e42061ad8338d382dffbdbe5 --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

x86_64-gnu-llvm-19: 2925.3s -> 2422.9s (-17.2%)
pr-check-1: 1705.4s -> 1430.8s (-16.1%)
x86_64-rust-for-linux: 2967.3s -> 2562.1s (-13.7%)
aarch64-apple: 4853.3s -> 5392.7s (11.1%)
i686-gnu-1: 8062.4s -> 7276.5s (-9.7%)
i686-gnu-2: 6080.3s -> 5489.5s (-9.7%)
aarch64-gnu-llvm-19-2: 2552.3s -> 2312.4s (-9.4%)
dist-aarch64-msvc: 6039.6s -> 5494.0s (-9.0%)
i686-gnu-nopt-1: 8181.8s -> 7474.5s (-8.6%)
x86_64-gnu-aux: 6900.2s -> 6331.8s (-8.2%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

rust-timer · 2025-09-05T12:19:07Z

Finished benchmarking commit (ad85bc5): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.1%	[-0.1%, -0.1%]	6
Improvements ✅ (secondary)	-1.1%	[-2.0%, -0.4%]	8
All ❌✅ (primary)	-0.1%	[-0.1%, -0.1%]	6

Max RSS (memory usage)

Results (primary 0.5%, secondary 2.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.5%	[0.5%, 0.5%]	1
Regressions ❌ (secondary)	3.5%	[2.4%, 4.5%]	4
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.3%	[-2.3%, -2.3%]	1
All ❌✅ (primary)	0.5%	[0.5%, 0.5%]	1

Cycles

Results (secondary -2.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.5%	[-3.2%, -2.0%]	3
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 468.177s -> 467.829s (-0.07%)
Artifact size: 390.48 MiB -> 390.58 MiB (0.03%)

rustbot assigned fee1-dead Jul 31, 2025

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jul 31, 2025

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rust-bors bot added a commit that referenced this pull request Jul 31, 2025

Auto merge of #144737 - petrochenkov:extprelcache, r=<try>

f9cf5ef

[WIP] resolve: Better caching for unsuccessful crate resolutions

rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 31, 2025

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petrochenkov mentioned this pull request Jul 31, 2025

resolve: Cleanups and micro-optimizations to extern prelude #144746

Merged

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rust-bors bot added a commit that referenced this pull request Jul 31, 2025

Auto merge of #144737 - petrochenkov:extprelcache, r=<try>

b757ae7

[WIP] resolve: Better caching for unsuccessful crate resolutions

rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 31, 2025

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rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 31, 2025

rustbot added the S-blocked Status: Blocked on something else such as an RFC or other implementation work. label Jul 31, 2025

petrochenkov removed the S-blocked Status: Blocked on something else such as an RFC or other implementation work. label Aug 14, 2025

resolve: Avoid finalizing extern prelude entries more than once

235dfba

petrochenkov force-pushed the extprelcache branch from 2c5fb19 to 235dfba Compare September 2, 2025 13:22

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rust-bors bot added a commit that referenced this pull request Sep 2, 2025

Auto merge of #144737 - petrochenkov:extprelcache, r=<try>

5c18da3

resolve: Avoid finalizing extern prelude entries more than once

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petrochenkov removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Sep 2, 2025

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rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Sep 2, 2025

rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 2, 2025

rustbot assigned davidtwco and unassigned fee1-dead Sep 3, 2025

davidtwco approved these changes Sep 4, 2025

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bors 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 Sep 4, 2025

bors added the merged-by-bors This PR was explicitly merged by bors. label Sep 5, 2025

bors merged commit ad85bc5 into rust-lang:master Sep 5, 2025
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rustbot added this to the 1.91.0 milestone Sep 5, 2025

rustbot removed the perf-regression Performance regression. label Sep 5, 2025

resolve: Avoid finalizing extern prelude entries more than once #144737

resolve: Avoid finalizing extern prelude entries more than once #144737

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Overall result: no relevant changes - no action needed

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Overall result: ✅ improvements - no action needed

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Overall result: ❌✅ regressions and improvements - please read the text below

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Test differences

Job duration changes

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rust-timer commented Sep 5, 2025

Overall result: ✅ improvements - no action needed

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petrochenkov commented Jul 31, 2025 •

edited

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