Add in opentelemetry tracing as a feature #3287
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Example trace showing the slow spots in |
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And trace of a test |
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I'll try it and review it recently. Thanks! |
0xPoe
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Update to resolve conflicts |
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Random MacOSX test failure with no visible cause :/ |
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May 3, 2023
| them temporarily while figuring out the shape of a problem) | ||
| - Be way of debug build timing - release optimisations make a huge difference, | ||
| though debug is a lot faster to iterate on. If something isn't a problem in | ||
| release don't pay it too much heed in debug. |
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| release don't pay it too much heed in debug. | |
| release don't pay it too much heed in debug |
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Why don't you want the trailing period ('.')?
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Because other sentences don't have it.
This is an evolution on the previous tracing support I added a few years back. See CONTRIBUTING for details. The rs_tracing crate is functionally fine but very limited in features compared to the tracing crate that provides the developer interface for opentelemetry instrumentation. As we start looking at performance again I think this tooling will be useful. Included is support for both tracing rustup-init and individual tests
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feat(cli): Allow logging to chrome traces ### What does this PR try to resolve? > The time from executing cargo to executing rustc is 230 ms. I wonder if there’s scope for caching whatever expensive computations cargo is doing here. *Source: https://davidlattimore.github.io/working-on-rust-iteration-time.html* This made me curious where the time was going. I've been meaning to try out `tracing-chrome` for a while and this gave me the opportunity. This adds `CARGO_LOG_PROFILE=<bool>` and `CARGO_LOG_PROFILE_CAPTURE_ARGS=<bool>` for enabling and controlling these trace files. These are perma-unstable env variables. Traces can be viewed at https://ui.perfetto.dev or `chrome://tracing`. Example: no-op `cargo check` run on `cargo-nextest`:  TODO - [ ] Find a place to document this, see https://doc.crates.io/contrib/tests/profiling.html#internal-profiler ### How should we test and review this PR? I looked in `config/` and didn't see a env variable parser to reuse (`get_cv_with_env` is too specialized). ### Additional information In past projects, I've been able to use features like this to better understand code bases, bugs, etc. Hopefully this can evolve to help on-board people one day. Most of the implementation was inspired by https://github.com/arxanas/git-branchless/blob/2923924dfbff07faa61d50771b6604cb18e64bc8/git-branchless-invoke/src/lib.rs#L55 `tracing-chrome` hasn't received updates recently, but it is also fairly quiet on Issues and PRs, so this might just be "maturity". It does have over a million downloads. It also is only enabled if explicitly opted into. rustup added trace visualization in rust-lang/rustup#3287 using [open telemetry](https://crates.io/crates/tracing-opentelemetry) but it is behind a feature flag and and requires running a server to receive the traces.
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This is an evolution on the previous tracing support I added a few years
back. See CONTRIBUTING for details.
The rs_tracing crate is functionally fine but very limited in features
compared to the tracing crate that provides the developer interface for
opentelemetry instrumentation. As we start looking at performance again
I think this tooling will be useful.