Add triage for 2021-10-19 #1076
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| # 2021-10-19 Triage Log | |||
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| A week where improvements outweigh regressions. The highlight of the week is the change to split out LLVM profile guided optimization (PGO) and using clang 13 to compile LLVM which led to improvements in many real world crates (e.g., cargo) in the range of 10%. Most regressions were limited and at most in the less than 1% range. We are seeing more performance changes in rollups which are supposed to be performance neutral. We'll have to decide how to best address this. | |||
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FWIW the splitting out of LLVM PGO is performance-neutral, it's purely the bump of bootstrap C++ compiler to clang 13 that brings the large wins here.
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r=me |
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