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+# 2024-09-10 Triage Log
+
+A relatively quiet week with a majority of regressions coming in rollups which makes investigation more difficult. Luckily the regressions are relatively small and overall the week was a slight improvement in compiler performance.
+
+Triage done by **@rylev**.
+Revision range: [6199b69c..263a3aee](https://perf.rust-lang.org/?start=6199b69c53a8c275ca3cd59647ea0af5ca29aae2&end=263a3aeeb8f2d0e9cc85eee61774d1f5f23dc3f5&absolute=false&stat=instructions%3Au)
+
+**Summary**:
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.6% | [0.2%, 1.4%] | 57 |
+| Regressions ❌
(secondary) | 0.7% | [0.2%, 1.5%] | 23 |
+| Improvements ✅
(primary) | -2.2% | [-4.0%, -0.4%] | 23 |
+| Improvements ✅
(secondary) | -0.3% | [-0.3%, -0.2%] | 10 |
+| All ❌✅ (primary) | -0.2% | [-4.0%, 1.4%] | 80 |
+
+
+3 Regressions, 1 Improvement, 2 Mixed; 3 of them in rollups
+26 artifact comparisons made in total
+
+#### Regressions
+
+Rollup of 8 pull requests [#129922](https://github.com/rust-lang/rust/pull/129922) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=6199b69c53a8c275ca3cd59647ea0af5ca29aae2&end=d6c8169c186ab16a3404cd0d0866674018e8a19e&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 5.8% | [5.8%, 5.8%] | 1 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | - | - | 0 |
+- Noise
+
+
+Update x86_64-linux host compiler to LLVM 19 rc 3 [#129356](https://github.com/rust-lang/rust/pull/129356) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=d6c8169c186ab16a3404cd0d0866674018e8a19e&end=842d6fc32e3d0d26bb11fbe6a2f6ae2afccc06cb&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.5% | [0.2%, 0.8%] | 34 |
+| Regressions ❌
(secondary) | 2.6% | [0.5%, 5.7%] | 6 |
+| Improvements ✅
(primary) | -0.4% | [-0.4%, -0.4%] | 1 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.5% | [-0.4%, 0.8%] | 35 |
+- "Looks like this update is a very mild regression, but not enough to look into it in more detail, or skip this version."
+
+
+Rollup of 10 pull requests [#130091](https://github.com/rust-lang/rust/pull/130091) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=12b26c13fba25c9e1bc2fdf05f3c2dbb851c83de&end=878f49f5ff0dd88a85bcd5d99fc0d90e219c354c&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.9% | [0.3%, 1.7%] | 13 |
+| Regressions ❌
(secondary) | 0.8% | [0.2%, 1.3%] | 14 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.9% | [0.3%, 1.7%] | 13 |
+- Regressions are happening in `expand_crate` so testing a change that touched `rustc_expand`
+
+
+#### Improvements
+
+Use `DeepRejectCtxt` to quickly reject `ParamEnv` candidates [#128776](https://github.com/rust-lang/rust/pull/128776) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=17b322fa69eed7216dccc9f097eb68237cf62234&end=26b5599e4d6ed2b45152c60493c1788c0a27533d&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -1.8% | [-4.7%, -0.3%] | 17 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -1.8% | [-4.7%, -0.3%] | 17 |
+
+
+#### Mixed
+
+Rollup of 10 pull requests [#129978](https://github.com/rust-lang/rust/pull/129978) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=009e73825af0e59ad4fc603562e038b3dbd6593a&end=eb33b43bab08223fa6b46abacc1e95e859fe375d&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.4% | [0.3%, 0.5%] | 4 |
+| Regressions ❌
(secondary) | 0.4% | [0.4%, 0.4%] | 1 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | -3.1% | [-3.1%, -3.1%] | 1 |
+| All ❌✅ (primary) | 0.4% | [0.3%, 0.5%] | 4 |
+- The regressions here are small enough that I don't think it's worth investigating further.
+
+
+stabilize `-Znext-solver=coherence` [#121848](https://github.com/rust-lang/rust/pull/121848) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=59d4114b2d1aaac9a6dfe770997f2e79ccfd28ab&end=17b322fa69eed7216dccc9f097eb68237cf62234&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.4% | [0.2%, 0.6%] | 11 |
+| Regressions ❌
(secondary) | 1.1% | [0.4%, 5.1%] | 8 |
+| Improvements ✅
(primary) | -3.4% | [-4.2%, -2.8%] | 7 |
+| Improvements ✅
(secondary) | -0.3% | [-0.3%, -0.2%] | 5 |
+| All ❌✅ (primary) | -1.1% | [-4.2%, 0.6%] | 18 |
+- Mainly noise
+