rust-lang / rust-lang/rustc-perf
Display number of invalidations per query
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- Dominant language
- Rust
- Stars
- 732
- Forks
- 189
- Avg merge
- 10h 52m
- Merged PRs (30d)
- 43
Description
Slowdowns in incremental benchmarks can often be due to increased query invalidation (adding extra query dependency edges, or making a stable hash dependent on more inputs). It would be useful to display a count/percentage of query invalidations on a per-queery basis, as well as a diff between the old and new runs.
Contributor guide
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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 by tracing how rustc-perf records and presents incremental benchmark results. Check whether query invalidation counts are already exposed in the benchmark data, then determine how old and new runs are compared. Done means the report shows per-query invalidation counts or percentages and a comparison between runs.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- performance
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100