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+# 2023-10-26 Triage Log
+
+A largely positive week with really only 1 true regression and 1 large improvement both by cjgillot proving that the compiler giveth and taketh away. The improvement, an improvement in the borrow checker, lead to a 0.7% improvement across ~80 benchmarks while the regression had the same magnitude but only impacted 18 benchmarks.
+
+Triage done by **@rylev**.
+Revision range: [b9832e7..698db85](https://perf.rust-lang.org/?start=b9832e72c9223f4e96049aa5911effd258b92591&end=698db856de0b67313ddcb96b6599598058489ea9&absolute=false&stat=instructions%3Au)
+
+**Summary**:
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.5% | [0.2%, 3.4%] | 17 |
+| Regressions ❌
(secondary) | 1.2% | [0.9%, 1.7%] | 11 |
+| Improvements ✅
(primary) | -0.8% | [-3.0%, -0.1%] | 85 |
+| Improvements ✅
(secondary) | -1.0% | [-1.8%, -0.1%] | 31 |
+| All ❌✅ (primary) | -0.6% | [-3.0%, 3.4%] | 102 |
+
+
+7 Regressions, 6 Improvements, 4 Mixed; 5 of them in rollups
+85 artifact comparisons made in total
+
+#### Regressions
+
+Bump `COINDUCTIVE_OVERLAP_IN_COHERENCE` to deny + warn in deps [#116493](https://github.com/rust-lang/rust/pull/116493) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=cc705b801236d064260bb67b3a0a25e4747fa7ec&end=0039d739d40a076334e111488946441378d11cd7&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 0.7% | [0.7%, 0.8%] | 2 |
+| Regressions ❌
(secondary) | 0.4% | [0.3%, 0.6%] | 3 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.7% | [0.7%, 0.8%] | 2 |
+- Noise
+
+
+Rollup of 7 pull requests [#116923](https://github.com/rust-lang/rust/pull/116923) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=020d00867a0129fe77d02fb7f07d6bc96a7033ff&end=36b61e5aa593cc60cc92fc548b0d351e414aee2a&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 0.3% | [0.2%, 0.4%] | 9 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | - | - | 0 |
+- While this very much does not look like noise, the regressions are small enough that I don't think this is really worth any investigation.
+
+
+Rollup of 4 pull requests [#116940](https://github.com/rust-lang/rust/pull/116940) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=3fbcfd2b6f7030cb70328aa759107efc1516912c&end=c104861b7b51d2c28e7023e7e53db16cc6677e29&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.7% | [0.2%, 1.2%] | 18 |
+| Regressions ❌
(secondary) | 1.0% | [0.7%, 1.2%] | 9 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | -1.8% | [-1.8%, -1.8%] | 1 |
+| All ❌✅ (primary) | 0.7% | [0.2%, 1.2%] | 18 |
+- From lqd "I think this is all in mir transforms, likely the additional pass name calls and string finds in turn -- and since is all static data, maybe should be cached, and stored in a better-suited data structure."
+- [#116896](https://github.com/rust-lang/rust/pull/116896) is the culprit. Following up with the author, cjgillot.
+
+
+Lint `non_exhaustive_omitted_patterns` by columns [#116734](https://github.com/rust-lang/rust/pull/116734) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=6f97d838c644174b38413d920ed8d43b70cdc7db&end=786c94a4ebf8df6207a3ce146a687e66f3ced369&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | 1.5% | [1.5%, 1.6%] | 7 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | - | - | 0 |
+- Given that the impacted benchmark is the stress test for the code in question, I think the small regression is fine.
+
+
+Suggest removing redundant arguments in format!() [#115324](https://github.com/rust-lang/rust/pull/115324) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=913ceaee96581232cbb8eedb43224f442e0c5287&end=111adde7ed86b848e61d1bd3cb431f9c52584317&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 2.1% | [0.3%, 3.9%] | 2 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 2.1% | [0.3%, 3.9%] | 2 |
+- The perf regression is likely noise.
+
+
+Rollup of 5 pull requests [#117087](https://github.com/rust-lang/rust/pull/117087) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=858a42bf46a49bc64228d69b757294fe7a9bba6c&end=e2068cdb0964ccbae614ab60cddeed7b24473cdd&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 4.1% | [4.1%, 4.1%] | 1 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 4.1% | [4.1%, 4.1%] | 1 |
+- Noise
+
+
+Improve android-ndk property interface [#116998](https://github.com/rust-lang/rust/pull/116998) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=cd674d61790607dfb6faa9d754bd3adfa13aea7c&end=f1a5ce19f5aa0cf61ed7b9f75b30e610befeed72&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:----:|:------------:|:-----:|
+| Regressions ❌
(primary) | 3.9% | [3.9%, 3.9%] | 1 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 3.9% | [3.9%, 3.9%] | 1 |
+- Noise
+
+
+#### Improvements
+
+Panic when the global allocator tries to register a TLS destructor [#116402](https://github.com/rust-lang/rust/pull/116402) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=0039d739d40a076334e111488946441378d11cd7&end=89432aadcb3174a0d7611557fa9b1ef05c72b920&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.7% | [-0.7%, -0.7%] | 2 |
+| Improvements ✅
(secondary) | -0.4% | [-0.7%, -0.2%] | 14 |
+| All ❌✅ (primary) | -0.7% | [-0.7%, -0.7%] | 2 |
+
+
+On Windows make `read_dir` error on the empty path [#116606](https://github.com/rust-lang/rust/pull/116606) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=62fae2305e5f3a959bd6ad6c20608c118e93648a&end=aec4741d42e10673e7d5fe0f1c96d407801884e8&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -2.8% | [-2.8%, -2.8%] | 1 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -2.8% | [-2.8%, -2.8%] | 1 |
+
+This is noise.
+
+Separate move path tracking between borrowck and drop elaboration. [#116300](https://github.com/rust-lang/rust/pull/116300) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=f654229c27267334023a22233795b88b75fc340e&end=cd674d61790607dfb6faa9d754bd3adfa13aea7c&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.2% | [0.1%, 0.2%] | 5 |
+| Regressions ❌
(secondary) | 0.2% | [0.2%, 0.2%] | 2 |
+| Improvements ✅
(primary) | -0.7% | [-3.6%, -0.2%] | 77 |
+| Improvements ✅
(secondary) | -1.1% | [-1.8%, -0.4%] | 30 |
+| All ❌✅ (primary) | -0.7% | [-3.6%, 0.2%] | 82 |
+
+
+time: use clock_gettime on macos [#116238](https://github.com/rust-lang/rust/pull/116238) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=f1a5ce19f5aa0cf61ed7b9f75b30e610befeed72&end=e918db897df677d9bbda64d82ebbb8f1bc9e557f&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -3.6% | [-3.6%, -3.6%] | 1 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -3.6% | [-3.6%, -3.6%] | 1 |
+
+This is noise.
+
+Uplift `ClauseKind` and `PredicateKind` into `rustc_type_ir` [#116993](https://github.com/rust-lang/rust/pull/116993) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=2e4e2a8f288f642cafcc41fff211955ceddc453d&end=98108dc26cb3f73f29c07b03ab75540545f3b481&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.5% | [-0.8%, -0.2%] | 14 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -0.5% | [-0.8%, -0.2%] | 14 |
+
+
+Refactor type visitor walking [#117076](https://github.com/rust-lang/rust/pull/117076) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=c716f180e8c48b12bb055e6a7dea2a7f474cf66d&end=c2ef35161fc7477b38f2e556be2fd6d85d9f4905&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | - | - | 0 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.2% | [-0.3%, -0.1%] | 11 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -0.2% | [-0.3%, -0.1%] | 11 |
+
+
+#### Mixed
+
+Rollup of 5 pull requests [#116885](https://github.com/rust-lang/rust/pull/116885) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=e8b8c78d84572e5b2e69dc4cc378ebfefe38562d&end=e1de04ad4e32afc6c82080a0b46408fee31dce88&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.5% | [0.5%, 0.5%] | 1 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -0.3% | [-0.5%, -0.2%] | 9 |
+| Improvements ✅
(secondary) | -0.6% | [-0.9%, -0.3%] | 13 |
+| All ❌✅ (primary) | -0.2% | [-0.5%, 0.5%] | 10 |
+- Improvements outweigh regressions.
+
+
+Update hashbrown to 0.14.2 [#116956](https://github.com/rust-lang/rust/pull/116956) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=9e3f784eb2c7c847b6c3578b373c0e0bc9233ca3&end=cc3dce5bd07057818f3f69c3ce93bfd596fd8f0f&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.4% | [0.2%, 0.5%] | 7 |
+| Regressions ❌
(secondary) | 0.2% | [0.2%, 0.3%] | 3 |
+| Improvements ✅
(primary) | -0.6% | [-1.2%, -0.2%] | 5 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | -0.0% | [-1.2%, 0.5%] | 12 |
+- Mostly neutral - max-rss regression seems to have corrected itself in the meantime
+
+
+report `unused_import` for empty reexports even it is pub [#116033](https://github.com/rust-lang/rust/pull/116033) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=1322f9263410116cc565129bb517a35227c28479&end=41aa06ecf963cf3529146159f761d6e5b5f9cb48&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 0.4% | [0.3%, 0.5%] | 13 |
+| Regressions ❌
(secondary) | - | - | 0 |
+| Improvements ✅
(primary) | -3.7% | [-3.7%, -3.7%] | 1 |
+| Improvements ✅
(secondary) | - | - | 0 |
+| All ❌✅ (primary) | 0.1% | [-3.7%, 0.5%] | 14 |
+- Small regression - asked the author and reviewer if they feel like they had a quick idea how to address it.
+
+
+Rollup of 7 pull requests [#117180](https://github.com/rust-lang/rust/pull/117180) [(Comparison Link)](https://perf.rust-lang.org/compare.html?start=cf226e93dcb0e21e2daa7c26aca0c5b46ff1b646&end=ab5c841a1f3c09edc5ea07722519627c960aed17&stat=instructions:u)
+
+| (instructions:u) | mean | range | count |
+|:----------------------------------:|:-----:|:--------------:|:-----:|
+| Regressions ❌
(primary) | 3.7% | [3.7%, 3.7%] | 1 |
+| Regressions ❌
(secondary) | 0.2% | [0.2%, 0.2%] | 1 |
+| Improvements ✅
(primary) | - | - | 0 |
+| Improvements ✅
(secondary) | -1.3% | [-1.3%, -1.3%] | 1 |
+| All ❌✅ (primary) | 3.7% | [3.7%, 3.7%] | 1 |
+
+The one primary 3.7% regression looks real. The tiny secondary one looks either noise or has basically returned to its prior value. The small improvement also seems to have sustained at the new levels.