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Comment by sapiogram | Hacker News Reader

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sapiogram·

Thanks for actually including the slow repo in your comment. My results on a Ryzen 5900X:

* Clean debug build: 1m 22s

* Incremental debug build: 13s

* Clean release build: 1m 51s

* Incremental release build: 24s

Incremental builds were done by changing one line in creates/symbolicator/src/cli.rs.

It's not great, but it sounds like your experience was much worse for some reason.

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For reference, buildkite-agent [0] is about 40k lines of go. Running `go build` including dependencies took 40 seconds, and running `go clean && go build` took 2 seconds. I know Go and Rust aren't comparable, but Rust's attitude appears to be "we don't really care" when you compare it to Go, considering they both started at _roughly_ the same time and Rust's first stable release came long after Go was in use.

[0] https://github.com/buildkite/agent

Note that `go clean` doesn't actually clear dependencies, which are stored globally. It's possible that your initial compile also wasn't a true clean compile, because some modules were already cached globally.

Sorry - my clean build was actually including the dependency fetching, which is a large part of it. My experience was in 2023 which if we go by article roughly scales with compiler performance to 5 minutes or so

I do wonder how much the fetch-source-and-build-all-dependencies approach contributes to the poor perception of compile times -- your very first experience of "how long did cargo take to build this project" will be terrible because it will include downloading and building a ton of dependencies...

Agreed - I didn't do reliable benchmarks on how long was fetch + compile dependencies vs compiling the project itself.

My build times also included fetching dependencies, which only took a few seconds on my modestly fast 8 MB/s network.

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