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Add triage for this week
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‎triage/2024-12-09.md‎

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# 2024-12-09 Triage Log
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A pretty quiet week, with both few PRs landed and no significant changes in performance.
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Triage done by **@simulacrum**.
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Revision range: [490b2cc0..1b3fb316](https://perf.rust-lang.org/?start=490b2cc09860dd62a7595bb07364d71c12ce4e60&end=1b3fb316751227d30b1523ed0e3f00d83956d4d0&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) | 0.3% | [0.1%, 1.4%] | 84 |
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| Regressions ❌ <br /> (secondary) | 0.3% | [0.1%, 0.7%] | 45 |
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| Improvements ✅ <br /> (primary) | -0.4% | [-1.2%, -0.1%] | 42 |
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| Improvements ✅ <br /> (secondary) | -0.8% | [-1.2%, -0.4%] | 19 |
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| All ❌✅ (primary) | 0.1% | [-1.2%, 1.4%] | 126 |
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0 Regressions, 0 Improvements, 7 Mixed; 4 of them in rollups
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25 artifact comparisons made in total
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#### Regressions
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None this week.
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#### Improvements
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Remove polymorphization [#133883](https://github.com/rust-lang/rust/pull/133883) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=75716b45105e443199ce9800c7009ddfd6d2be53&end=ca13e9169fbbbb126190631b5a1e3e20053a52c1&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | 0.5% | [0.3%, 0.7%] | 6 |
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| Improvements ✅ <br /> (primary) | -0.5% | [-1.3%, -0.1%] | 91 |
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| Improvements ✅ <br /> (secondary) | -0.7% | [-1.7%, -0.3%] | 21 |
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| All ❌✅ (primary) | -0.5% | [-1.3%, -0.1%] | 91 |
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This is essentially a solid improvement. We still did the evaluation of
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polymorphization even if it wasn't actually enabled, so this just saves that
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time by dropping all of that computation.
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#### Mixed
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Rollup of 6 pull requests [#133841](https://github.com/rust-lang/rust/pull/133841) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=2633e019298f8d9f671c8f3d0d3348ce6fa1b8aa&end=733616f7236b4be140ce851a30b3bb06532b9364&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.7% | [0.2%, 1.4%] | 10 |
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| Regressions ❌ <br /> (secondary) | 0.6% | [0.6%, 0.6%] | 1 |
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| Improvements ✅ <br /> (primary) | -0.3% | [-0.5%, -0.1%] | 2 |
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| Improvements ✅ <br /> (secondary) | -0.2% | [-0.4%, -0.1%] | 5 |
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| All ❌✅ (primary) | 0.5% | [-0.5%, 1.4%] | 12 |
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Mixed results, but seems like a real regression on a few larger benchmarks in
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opt, non-incremental scenarios. Possibly due to
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https://github.com/rust-lang/rust/pull/133798, trying an unrolled build to
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verify.
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Rollup of 8 pull requests [#133940](https://github.com/rust-lang/rust/pull/133940) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=c94848c046d29f9a80c09aae758e27e418a289f2&end=706141b8d9090228343340378b1d4a2b095fa1fb&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.4% | [0.1%, 0.9%] | 87 |
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| Regressions ❌ <br /> (secondary) | 0.4% | [0.1%, 1.4%] | 31 |
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| Improvements ✅ <br /> (primary) | - | - | 0 |
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| Improvements ✅ <br /> (secondary) | -1.7% | [-1.9%, -1.6%] | 6 |
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| All ❌✅ (primary) | 0.4% | [0.1%, 0.9%] | 87 |
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Root-caused and discussed here:
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https://github.com/rust-lang/rust/pull/133607#issuecomment-2524194699, some
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optimizations expected to reduce the impact.
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Implementation of `fmt::FormattingOptions` [#118159](https://github.com/rust-lang/rust/pull/118159) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=8dc83770f748c6cd16b342889ca2240397c19534&end=75716b45105e443199ce9800c7009ddfd6d2be53&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.3% | [0.2%, 0.4%] | 2 |
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| Regressions ❌ <br /> (secondary) | 0.3% | [0.3%, 0.3%] | 1 |
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| Improvements ✅ <br /> (primary) | -0.4% | [-0.4%, -0.4%] | 1 |
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| Improvements ✅ <br /> (secondary) | - | - | 0 |
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| All ❌✅ (primary) | 0.1% | [-0.4%, 0.4%] | 3 |
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A few regressions in primary benchmarks, but not worth follow-up given the
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small magnitude, small number of affected builds, lack of clera `cycles`
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impact, etc.
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Rollup of 7 pull requests [#133978](https://github.com/rust-lang/rust/pull/133978) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=cdb89d6b15056a5cfa8932231360ae358b08983f&end=9c707a8b769523bb6768bf58e74fa2c39cc24844&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.3% | [0.3%, 0.3%] | 1 |
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| Regressions ❌ <br /> (secondary) | 0.3% | [0.2%, 0.3%] | 9 |
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| Improvements ✅ <br /> (primary) | - | - | 0 |
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| Improvements ✅ <br /> (secondary) | -0.2% | [-0.3%, -0.1%] | 2 |
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| All ❌✅ (primary) | 0.3% | [0.3%, 0.3%] | 1 |
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Expected regression in doc builds due to additional trait implementations in the standard library.
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Rollup of 7 pull requests [#134033](https://github.com/rust-lang/rust/pull/134033) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=f415c07494b98e4559e4b13a9c5f867b0e6b2444&end=f33a8c6426074b7ce8d08740e9805fdca96ee150&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | 0.3% | [0.2%, 0.3%] | 6 |
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| Regressions ❌ <br /> (secondary) | 0.3% | [0.2%, 0.5%] | 6 |
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| Improvements ✅ <br /> (primary) | - | - | 0 |
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| Improvements ✅ <br /> (secondary) | -1.3% | [-2.2%, -0.3%] | 2 |
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| All ❌✅ (primary) | 0.3% | [0.2%, 0.3%] | 6 |
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Single benchmark regression, limited to incremental scenarios. Seems plausible
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this is due to #133992, which obviously does more (necessary for correctness)
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work.
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Introduce `MixedBitSet` [#133891](https://github.com/rust-lang/rust/pull/133891) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=1b3fb316751227d30b1523ed0e3f00d83956d4d0&end=f6cb952dc115fd1311b02b694933e31d8dc8b002&stat=instructions:u)
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| (instructions:u) | mean | range | count |
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|:----------------------------------:|:-----:|:--------------:|:-----:|
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| Regressions ❌ <br /> (primary) | - | - | 0 |
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| Regressions ❌ <br /> (secondary) | 0.6% | [0.2%, 1.0%] | 8 |
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| Improvements ✅ <br /> (primary) | -0.6% | [-1.3%, -0.2%] | 67 |
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| Improvements ✅ <br /> (secondary) | -0.7% | [-2.0%, -0.2%] | 28 |
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| All ❌✅ (primary) | -0.6% | [-1.3%, -0.2%] | 67 |
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Expected changes, primarily an improvement rather than a regression. Overall a positive change.

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