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Sep 23, 2025
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Add 2025-09-23 perf triage #7055

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24 changes: 23 additions & 1 deletion draft/2025-09-24-this-week-in-rust.md
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Expand Up @@ -141,7 +141,29 @@ If you are an event organizer hoping to expand the reach of your event, please s

### Rust Compiler Performance Triage

<!-- Perf results go here -->
Moving command-line argument quoting from C++ to Rust ([#146700](https://github.com/rust-lang/rust/pull/146700)) resulted in a nice performance
win when dealing with many dependencies and large workspaces. A somewhat costly destination propagation
compiler pass was enabled by default ([#142915](https://github.com/rust-lang/rust/pull/142915)), which resulted in some build time regressions,
but should result in improved runtime performance. The rest of changes were small.

Triage done by **@kobzol**.
Revision range: [52618eb3..ce4beebe](https://perf.rust-lang.org/?start=52618eb338609df44978b0ca4451ab7941fd1c7a&end=ce4beebecb77821734079cff47d8af08f9f27f11&absolute=false&stat=instructions%3Au)

**Summary**:

| (instructions:u) | mean | range | count |
|:----------------------------------:|:-----:|:---------------:|:-----:|
| Regressions ❌ <br /> (primary) | 0.3% | [0.1%, 1.9%] | 61 |
| Regressions ❌ <br /> (secondary) | 0.6% | [0.1%, 3.4%] | 90 |
| Improvements ✅ <br /> (primary) | -0.5% | [-1.9%, -0.2%] | 29 |
| Improvements ✅ <br /> (secondary) | -1.3% | [-22.8%, -0.1%] | 71 |
| All ❌✅ (primary) | 0.0% | [-1.9%, 1.9%] | 90 |


1 Regression, 4 Improvements, 4 Mixed; 4 of them in rollups
37 artifact comparisons made in total

[Full report here](https://github.com/rust-lang/rustc-perf/blob/8e7c75c12a21eb9c8c86cbfc75eff144a017f6b2/triage/2025/2025-09-23.md).

### [Approved RFCs](https://github.com/rust-lang/rfcs/commits/master)

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