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Reduce optimization level#149428

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Mostly trying to see what the delta in build time vs. runtime performance is on our perf suite, I think it's unlikely we'd want to land this.

r? ghost

Mostly trying to see what the delta in build time vs. runtimeperformance is on our perf suite, I think it's unlikely we'd want toland this.
@rustbotrustbot added S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author. T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) labelsNov 28, 2025
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@bors try@rust-timer queue

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rust-borsbot added a commit that referenced this pull requestNov 28, 2025
@rustbotrustbot added the S-waiting-on-perfStatus: Waiting on a perf run to be completed. labelNov 28, 2025
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☀️ Try build successful (CI)
Build commit:27641ce (27641cefbed45ce5077076aeee68006ab17894d2, parent:9050733395f7c10560d49f549e022f411fa28cea)

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Finished benchmarking commit (27641ce):comparison URL.

Overall result: ❌ regressions - 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.

meanrangecount
Regressions ❌
(primary)		14.8%[0.7%, 29.9%]269
Regressions ❌
(secondary)		16.8%[0.6%, 52.0%]314
Improvements ✅
(primary)		--0
Improvements ✅
(secondary)		--0
All ❌✅ (primary)14.8%[0.7%, 29.9%]269

Max RSS (memory usage)

Results (primary 3.4%, secondary 4.7%)

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

meanrangecount
Regressions ❌
(primary)		3.4%[0.5%, 11.5%]131
Regressions ❌
(secondary)		4.7%[0.6%, 11.9%]258
Improvements ✅
(primary)		--0
Improvements ✅
(secondary)		--0
All ❌✅ (primary)3.4%[0.5%, 11.5%]131

Cycles

Results (primary 8.9%, secondary 12.0%)

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

meanrangecount
Regressions ❌
(primary)		8.9%[2.0%, 24.4%]244
Regressions ❌
(secondary)		12.0%[1.6%, 48.9%]301
Improvements ✅
(primary)		--0
Improvements ✅
(secondary)		--0
All ❌✅ (primary)8.9%[2.0%, 24.4%]244

Binary size

Results (primary 0.1%, secondary 0.1%)

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

meanrangecount
Regressions ❌
(primary)		0.1%[0.1%, 0.1%]4
Regressions ❌
(secondary)		0.1%[0.1%, 0.1%]34
Improvements ✅
(primary)		--0
Improvements ✅
(secondary)		--0
All ❌✅ (primary)0.1%[0.1%, 0.1%]4

Bootstrap: 473.019s -> 360.071s (-23.88%)
Artifact size: 386.89 MiB -> 456.05 MiB (17.88%)

@rustbotrustbot added perf-regressionPerformance regression. and removed S-waiting-on-perfStatus: Waiting on a perf run to be completed. labelsNov 29, 2025
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perf-regressionPerformance regression.S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

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