Gache

Gache is an ultra-fast, lock-free in-memory cache library for Go. It uses a sharded concurrent map combined with xxhash for O(1) lookups with near-zero contention.

Performance

Library	ns/op	Allocs/op	Notes
gache	~378	0	Small data, no GC
go-cache	~3233	varies	Mutex-based

8.5× faster than go-cache for small data, with zero allocations in the hot path.

Key Features

• Lock-free reads — sharded design eliminates global lock contention
• xxhash — extremely fast non-cryptographic hash for key distribution
• TTL support — per-entry expiration with lazy and active eviction
• Generic API — type-safe cache with Go generics
• Zero allocation hot path — designed for high-throughput, low-latency workloads

Usage

import "github.com/kpango/gache/v2"

cache := gache.New[string]()
cache.Set("key", "value")

val, ok := cache.Get("key")

Design

Gache shards the keyspace across N buckets (default: runtime.NumCPU() × 2). Each shard is independently locked, so concurrent reads and writes on different keys never contend. xxhash maps keys to shards in nanoseconds.

Links

• GitHub