VictoriaMetrics/fastcache

Health v2 · maintenance only

Adoption not part of the score

2370 stars · 194 forks observed · 2026-08-28

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

fastcache is a fast, thread-safe in-memory cache library for Go designed to hold a large number of entries with minimal garbage collection overhead. It automatically evicts old entries when reaching a configured maximum size and supports saving/loading the cache to and from files.

Use cases

• cache millions of key-value entries in a Go service without GC pauses
• replace Go maps or sync.Map for high-throughput concurrent caching
• add an in-process cache with automatic eviction at a fixed memory budget
• persist cache contents to disk and reload on process restart
• speed up hot-path lookups in multi-core Go applications

When to choose

• you need a fast in-memory cache in Go with minimal GC overhead
• you store a very large number of entries and standard maps cause GC pressure
• you want a simple API with automatic size-based eviction
• you need to snapshot the cache to a file and restore it later

When to avoid

• you need a distributed or networked cache like Redis or Memcached
• you need TTL-based per-entry expiration
• you need rich eviction policies like LRU or LFU
• your dataset is small enough that a plain Go map suffices

Facets

library · maturity stable

caching developer-tools performance backend go windows cross-platform inmemory-cache thread-safe low-gc-overhead key-value-cache go-library linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="VictoriaMetrics/fastcache")