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Feb 20, 2025
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Add 2025-02-18 perf triage #6392

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23 changes: 22 additions & 1 deletion draft/2025-02-19-this-week-in-rust.md
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Expand Up @@ -113,7 +113,28 @@ If you are an event organizer hoping to expand the reach of your event, please s

### Rust Compiler Performance Triage

<!-- Perf results go here -->
This week's results were dominated by the update to LLVM 20 ([#135763](https://github.com/rust-lang/rust/pull/135763)),
which brought a large number of performance improvements, as usually. There were also two other
significant improvements, caused by improving the representation of `const` values ([#136593](https://github.com/rust-lang/rust/pull/136593)) and doing less work when formatting in `rustdoc` ([#136828](https://github.com/rust-lang/rust/pull/136828)).

Triage done by **@kobzol**.

Revision range: [c03c38d5..ce36a966](https://perf.rust-lang.org/?start=c03c38d5c2368cd2aa0e056dba060b94fc747f4e&end=ce36a966c79e109dabeef7a47fe68e5294c6d71e&absolute=false&stat=instructions%3Au)

**Summary**:

| (instructions:u) | mean | range | count |
|:----------------------------------:|:-----:|:---------------:|:-----:|
| Regressions ❌ <br /> (primary) | 4.4% | [0.2%, 35.8%] | 10 |
| Regressions ❌ <br /> (secondary) | 1.2% | [0.2%, 5.0%] | 13 |
| Improvements ✅ <br /> (primary) | -1.6% | [-10.5%, -0.2%] | 256 |
| Improvements ✅ <br /> (secondary) | -1.0% | [-4.7%, -0.2%] | 163 |
| All ❌✅ (primary) | -1.3% | [-10.5%, 35.8%] | 266 |

3 Regressions, 2 Improvements, 4 Mixed; 4 of them in rollups
50 artifact comparisons made in total

[Full report here](https://github.com/rust-lang/rustc-perf/blob/305a70edd98c32a4ea7388561841e5473b4bb153/triage/2025-02-18.md).

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

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