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Update jemalloc to 5.4.0 - #162965

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@mati865 mati865 commented Sep 18, 2026

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@rustbot rustbot added A-tidy Area: The tidy tool S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Sep 18, 2026
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@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 18, 2026
rust-bors Bot pushed a commit that referenced this pull request Sep 18, 2026
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☀️ Try build successful (CI)
Build commit: 59272b4 (59272b41d288dc8a35163bc03f4ad3d195b70b01)
Base parent: 498b89d (498b89dd40af107a23c13a009345a0dea224248c)

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Finished benchmarking commit (59272b4): comparison URL.

Overall result: ❌✅ regressions and improvements - please read:

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

@bors rollup=never rustc-perf
@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)
0.3% [0.1%, 0.9%] 20
Regressions ❌
(secondary)
0.4% [0.0%, 1.1%] 94
Improvements ✅
(primary)
-0.5% [-1.9%, -0.1%] 44
Improvements ✅
(secondary)
-0.6% [-1.4%, -0.1%] 42
All ❌✅ (primary) -0.2% [-1.9%, 0.9%] 64

Max RSS (memory usage)

Results (primary 3.1%, secondary 4.3%)

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

mean range count
Regressions ❌
(primary)
3.1% [0.6%, 8.5%] 204
Regressions ❌
(secondary)
4.6% [0.7%, 17.3%] 125
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-1.8% [-5.4%, -0.6%] 6
All ❌✅ (primary) 3.1% [0.6%, 8.5%] 204

Cycles

Results (primary 2.1%, secondary 13.9%)

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

mean range count
Regressions ❌
(primary)
2.1% [2.1%, 2.1%] 1
Regressions ❌
(secondary)
16.3% [2.0%, 28.4%] 14
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-2.9% [-3.4%, -2.4%] 2
All ❌✅ (primary) 2.1% [2.1%, 2.1%] 1

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: 497.674s -> 496.406s (-0.25%)
Artifact size: 408.91 MiB -> 406.94 MiB (-0.48%)

@rustbot rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Sep 18, 2026
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