1.56 Compile time is through the roof!?

• rust

  2,683 93,041 10.0 Rust

  Empowering everyone to build reliable and efficient software.

  

I'm seeing a similar thing, and it's not the linker. I was using mold originally, but turned it off in case that was the problem, and perf is showing all the time in rustc. See more details at https://github.com/rust-lang/rust/issues/90180

• measureme

  2 323 7.2 Rust

  Support crate for rustc's self-profiling feature

  

To dig further into one specific rustc process called by Cargo, cargo +nightly rustc -- -Z self-profile -p some_crate https://github.com/rust-lang/measureme/blob/master/summarize/README.md

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• axum

  150 16,204 9.2 Rust

  Ergonomic and modular web framework built with Tokio, Tower, and Hyper

  

Seems that Axum projects are hit by this https://github.com/tokio-rs/axum/issues/200

• libreddit

  283 4,996 5.2 Rust

  Private front-end for Reddit

  

https://libredd.it ftw! (on desktop, and on mobile)

• cargo-llvm-lines

  3 372 7.3 Rust

  Count lines of LLVM IR per generic function

If you want to dig further, I see though that some of this time is spent in codegen (generating LLVM IR) and in LLVM. Maybe something is generating much more IR than before, which then takes a lot of time to process. Another tool is https://github.com/dtolnay/cargo-llvm-lines which shows the number of lines of unoptimized LLVM IR for each of your functions. In general it can be useful to optimize compile times of your project, in this case it might show which area of your code triggers this bug.

• cargo-bisect-rustc

  4 172 7.8 Rust

  Bisects rustc, either nightlies or CI artifacts

  

Finally, https://github.com/rust-lang/cargo-bisect-rustc/blob/master/TUTORIAL.md can bisect Nightlies or (if recent enough, I think CI artifacts are kept 3 months) PRs to tell you one introduced a problem.

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