Blog Post: Fast Rust Builds

• cargo-sweep

  9 673 6.6 Rust

  A cargo subcommand for cleaning up unused build files generated by Cargo

cargo-sweep can do this kind of garbage collection along a few axes - rustc version, file age, was or wasn't used during recent build. Works great on Linux. I've not gotten it working reliably for -s/-f on MacOS+APFS, but for the CI use case it should be a nice improvement.

• proc-macro2

  4 675 9.0 Rust

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• mold

  179 13,302 9.7 C++

  Mold: A Modern Linker 🦠

Have you tried https://github.com/rui314/mold ? Claims to be significantly faster than lld.

• rules_rust

  9 610 9.6 Starlark

  Rust rules for Bazel

  

Other than that, the performance of both for builds should be determined exactly by the organization of code into separate crates and the rustc invocations. Bazel generally encourages smaller crates, but that's very subtle. There is at least 1 case I can think of where rustc is overfit to cargo, in a way that is not easily replicable by bazel, which is the metadata/rlib pipelining https://github.com/bazelbuild/rules_rust/issues/228

• cargo-chef

  18 1,519 7.2 Rust

  A cargo-subcommand to speed up Rust Docker builds using Docker layer caching.

I agree with you that the tutorial is incomplete, but I don't get what you're trying to say. Did you link the wrong thing? That is the CI for cargo-chef (as opposed to a CI setup with cargo-chef), which, unsurprisingly, doesn't use cargo-chef.

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