rust-lang / rust-lang/rustc-perf

Cannot enqueue more than one build for a PR at a time

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Dominant language
Rust
Stars
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Forks
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Avg merge
10h 52m
Merged PRs (30d)
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Description

When testing a regressed rollup, we may want to enqueue more than one build at a time. However, this is not possible because of a constraint on the database (found here). It's not clear to me if this constraint is actually needed or not. I can see how it might prevent certain bugs where we overly commit try builds, but in this case it is too restrictive. Can we remove this constraint?

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start in database/src/pool/postgres.rs at the constraint referenced in the issue and trace how builds are enqueued for a pull request. Determine whether removing it preserves the safeguards against overcommitting try builds; done means multiple builds can be enqueued for one PR without introducing those regressions.

Written by the indexing model from the issue text.

Assessment

Tech stack
postgresql, rust
Domain
database
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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