rust-lang / rust-lang/rustc-perf
coercions benchmark has high noise
Nobody has claimed this yet.
- Dominant language
- Rust
- Stars
- 732
- Forks
- 189
- Avg merge
- 10h 52m
- Merged PRs (30d)
- 43
Description
The coercions benchmark has been consistently quite noisy (over 1% regressions/improvements) for the last several months, at least, and may have recently gotten worse. The debug profile seems noisiest. We should aim to benchmark under cachegrind (notably, using production artifacts) to attempt to understand where the noise originates.
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the coercions benchmark and its debug profile, then inspect how benchmarks are run under cachegrind with production artifacts. Compare the observed noise across those configurations and document where it originates; done means the source of the over-1% variability is understood or the cachegrind approach is shown not to help.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100