xacrimon/dashmap

Health v2 · maintenance only

Adoption not part of the score

4119 stars · 191 forks observed · 2026-10-03

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

DashMap is a blazingly fast concurrent HashMap implementation for Rust with an API similar to std::collections::HashMap. It serves as a direct replacement for RwLock<HashMap<K, V>>, allowing shared mutable access across threads via Arc.

Use cases

• share a mutable hashmap across threads without manual locking
• replace RwLock<HashMap<K, V>> with a faster concurrent map
• build a thread-safe in-memory cache in Rust
• store shared state in a multi-threaded web server
• implement concurrent counters or key-value lookups

When to choose

• you need concurrent read/write access to a key-value map from multiple threads
• you want a drop-in API similar to std HashMap with interior mutability
• performance of lock-protected std HashMap is a bottleneck in your Rust application

When to avoid

• your map is only accessed from a single thread (use std::collections::HashMap)
• you need ordered maps or sorted iteration (use BTreeMap or an ordered concurrent structure)
• you need persistence or a networked key-value store (use a database instead)

Facets

library · maturity stable

concurrency caching developer-tools developer-tools performance rust cross-platform concurrent-hashmap sharded-map thread-safe data-structures lock-free algorithms

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