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Dec 16, 2021
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Add rustc performance triage report #2698

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12 changes: 6 additions & 6 deletions draft/2021-12-15-this-week-in-rust.md
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Expand Up @@ -104,15 +104,15 @@ If you are a Rust project owner and are looking for contributors, please submit

### Rust Compiler Performance Triage

A week of mostly rather small changes with many regressions being hard to diagnose. The largest regression comes from the introduction of a new future (desugaring `.await` into a call to `IntoFuture::into_future`). This was deemed acceptable as it only seems to have a negative impact in stress test situations where async/await is used more than one would normally expect. Unfortunately this does mean regressions beat out improvements this week.
This week's report started with 6 regressions; after eliminating truly obvious noise, we are left with just 2 minor regressions. Of the cases that regressed, I think the only interesting one is keccak (regressed by 1.73% in PR #91549). But don't be too depressed: keccak was also improved up to 23% by PR #85013 (!); thanks to @**simulacrum** for that PR.

Triage done by **@rylev**.
Revision range: [1c0287..ecb65b](https://perf.rust-lang.org/?start=1c0287830e0fb3c4007afea2819ba03766da6e9c&end=ecb65b0e170fc5275870c9d0fba7267a57cf35e5&absolute=false&stat=instructions%3Au)
Triage done by **@pnkfelix**.
Revision range: [e2116a..404c847](https://perf.rust-lang.org/?start=e2116acae59654bfab2a9729a024f3e2fd6d4b02&end=404c8471aba60c2d837fa728e7c729a0f52d5830&absolute=false&stat=instructions%3Au)

3 Regressions, 5 Improvements, 5 Mixed; 3 of them in rollups
31 comparisons made in total
2 Regressions, 5 Improvements, 3 Mixed; 1 of them in rollups
48 comparisons made in total

[Full report here](https://github.com/rust-lang/rustc-perf/blob/master/triage/2021-12-07.md)
[Full report here](https://github.com/rust-lang/rustc-perf/blob/master/triage/2021-12-14.md)

### [Approved RFCs](https://github.com/rust-lang/rfcs/commits/master)

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