Optimizing Rust with PGO and Bolt

Jon and Ben discuss the highlights of the 1.74 and 1.75 releases of Rust.

This episode was recorded as part of a YouTube live stream on 2024-05-18, which you can still watch.

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Timestamps & referenced resources

[@00:13] - Rust 1.74

• [@00:21] - Lint configuration through Cargo
• [@07:42] - Cargo registry authentication
  • Cargo documentation
• [@11:02] - Projections into opaque return types
• [@14:23] - Stabilized APIs
  • [@14:23] - io::Error::other
  • [@15:38] - Saturating wrapper type
  • [@18:43] - const transmute_copy
• [@18:03] - Compatibility notes
• [@20:51] - Changelog deep-dive
  • [@20:51] - --keep-going
  • [@22:42] - Cargo -p partial versions
  • [@24:21] - Warning boxes in rustdoc
  • [@26:02] - Generic parameters in rustdoc search
  • [@29:08] - impl Step for Ipv4
  • [@31:33] - private_in_public lint
    • RFC 2145
  • [@36:02] - New Cargo lockfile recommendation
    • Rationale

[@37:34] - Rust 1.74.1

No super interesting changes.

But, check in on PR filed during stream.

[@41:56] - Rust 1.75

• [@41:56] - async fn and -> impl Trait in traits
  • Blog announcing what’s actually stabilizing
  • Jon’s impl Trait talk
• [@55:34] - Pointer byte offset APIs
• [@58:22] - Code layout optimizations for rustc
  • BOLT
• [@1:04:34] - Stabilized APIs
  • [@1:04:34] - Atomic*::from_ptr
  • [@1:06:42] - OS-independent file times
  • [@1:07:46] - Option::as_slice
    • Long reddit comment
• [@1:09:59] - Changelog deep-dive
  • [@1:09:59] - impl BufRead for VecDeque<u8>
  • [@1:12:40] - Workspace-aware cargo new
  • [@1:13:20] - matching with exhaustive integer ranges
  • [@1:14:52] - Cross-crate auto-inlining for small fns
  • [@1:18:31] - Cargo output hyperlinking

[@1:22:00] - Mid-stream PR check-in

Another PR check-in and tracking in homu rustc build queue.

Credits

Intro Theme: Aerocity

Audio Editing: Aerocity

Hosting Infrastructure: Jon Gjengset

Show Notes: Jon Gjengset

Hosts: Jon Gjengset and Ben Striegel