Is there any tool for Rust that does profiling that detects what part of compilation time is caused by what? Like, a tool that reports:
- Parsing: x ms
- Type checking: y ms
- LLVM IR generation: z ms
And have there been any statistics done on that across open-source projects, like mean, median, percentiles and so on?
I am asking because it should depend a lot on each project what is costly in compile time, making it more difficult to analyse. And I am also curious about how many projects are covered by "edge cases", if it is 1%, 0.1%, 0.01%, and so on.
The post my original comment is on discusses doing this at length.
> And have there been any statistics done on that across open-source projects, like mean, median, percentiles and so on?
I am not aware of any. But in all the posts on this topic over the years, codegen always ends up being half the time. It’s why cargo check is built the way it is, and why it’s always faster than a full build. If non-codegen factors were significant with any regularity, you’d be seeing reports of check being super slow compared to build.
I have actually seen a few posts here and there of 'cargo check' being slow. I have also heard of complaints of rust-analyzer being slow, though rust-analyzer may be doing more than just 'cargo check'.
>Triage notes (AFAIUI): #132625 is merged, but the compile time is not fully clawed back as #132625 is a compromise between (full) soundness and performance in favor of a full revert (full revert would bring back more soundness problems AFAICT)
Update: They fixed it, but another issue surfaced, possibly related, as I read the comments.
- Parsing: x ms
- Type checking: y ms
- LLVM IR generation: z ms
And have there been any statistics done on that across open-source projects, like mean, median, percentiles and so on?
I am asking because it should depend a lot on each project what is costly in compile time, making it more difficult to analyse. And I am also curious about how many projects are covered by "edge cases", if it is 1%, 0.1%, 0.01%, and so on.