jonhoo/left-right

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

2277 stars · 112 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Left-right is a Rust concurrency primitive that maintains two copies of a data structure so many readers can access one copy in parallel while a single writer updates the other. It shifts synchronization overhead to the writer, letting reads scale linearly with core count when writes are infrequent.

Use cases

• read-heavy shared data structure with a single writer in Rust
• lock-free concurrent reads over a map or config
• scale reads linearly across cores without reader coordination
• replace RwLock for read-mostly workloads
• share frequently-read, rarely-written state across threads

When to choose

• your workload is read-dominated with one writer
• you need minimal coordination among readers
• you're in Rust and want a battle-tested concurrency primitive

When to avoid

• writes are frequent (doubled memory and write cost dominate)
• multiple writers are required
• memory overhead of duplicating the data structure is prohibitive

Facets

library · maturity stable

concurrency developer-tools performance rust cross-platform lock-free read-optimized single-writer concurrency-primitive rust-crate algorithms

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