`cargo test --all` should run tests in parallel

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
rust
Domain
build-system, testing-qa

Research direction

Start by tracing how cargo test --all currently schedules tests across workspace crates. Define completion as running tests from multiple crates concurrently while preserving correct results, then add or update coverage for workspace test execution.

Written by the indexing model from the issue text.

Description

A-edition-next C-feature-request Command-test S-needs-design

Currently if you have a workspace with a lot of crates, cargo test --all runs those tests one crate at a time. This is slow if you have a lot more cores than individual crates can saturate. It would speed things up a lot if cargo could run tests for multiple crates in parallel.

Dominant language
Rust
Stars
15.5k
Forks
3k
Avg merge
23h 30m
Merged PRs (30d)
51

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