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Add perf triage for 2025-04-30 (#6599)
Signed-off-by: Ryan Levick <[email protected]>
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draft/2025-04-30-this-week-in-rust.md

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### Rust Compiler Performance Triage
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<!-- Perf results go here -->
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Strange week with lots of noise peeking through the performance runs. The only really significant change was a performance improvement that comes from allowing out of order encoding of the dep graph.
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Triage done by **@rylev**.
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Revision range: [8f2819b0..25cdf1f6](https://perf.rust-lang.org/?start=8f2819b0e3428d0aee05fa60e91e0211c2aea053&end=25cdf1f67463c9365d8d83778c933ec7480e940b&absolute=false&stat=instructions%3Au)
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**Summary**:
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.5% | [0.1%, 3.0%] | 77 |
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| Regressions ❌ <br /> (secondary) | 0.6% | [0.1%, 2.4%] | 77 |
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| Improvements ✅ <br /> (primary) | -0.7% | [-1.3%, -0.2%] | 106 |
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| Improvements ✅ <br /> (secondary) | -0.7% | [-1.2%, -0.2%] | 29 |
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| All ❌✅ (primary) | -0.2% | [-1.3%, 3.0%] | 183 |
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4 Regressions, 2 Improvements, 4 Mixed; 2 of them in rollups
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38 artifact comparisons made in total
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[Full report here](https://github.com/rust-lang/rustc-perf/blob/748534344dceab1e8001a925cf84fa04a2c1c752/triage/2025-04-29.md)
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### [Approved RFCs](https://github.com/rust-lang/rfcs/commits/master)
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