Crate

rayon

Data parallelism for Rust — parallel iterators over thread pools.

What it is

rayon provides parallel iterators that distribute work across a work-stealing thread pool. Any sequential iterator chain can be parallelized by replacing .iter() with .par_iter(). Thread management, load balancing, and synchronization are automatic.

Why it is commonly used

Used in CPU-bound code that processes large collections — image processing, data analysis, search indexing, build systems, and numerical computing. par_iter() is the one-line path from sequential to parallel processing in Rust.

963
Repositories
87%
Actively maintained
835
Updated ≤ 30 days
3.3M
Total stars
845
Owners

Counted from the Cargo.toml manifests of the 963 indexed repositories that declare rayon as a dependency — not download counts. Dependency data last verified 2026-09-16.

Browse 963 repositories using rayon in Repos →
Often used with

Crates that show up unusually often in rayon projects. The most distinctive pairings rank first — crates these projects use far more than the average indexed Rust project does, not just crates that are popular everywhere. Each percentage is the share of rayon projects that also use it.

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