facebook/CacheLib

Health v2 · maintenance only

Adoption not part of the score

1585 stars · 322 forks observed · 2026-08-28

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

CacheLib is a C++ library providing a pluggable, thread-safe in-process caching engine with transparent DRAM and SSD tiering. It includes CacheBench, a benchmarking and stress-testing tool for evaluating cache heuristics, configurations, and hardware choices.

Use cases

• add high-throughput in-process caching to a C++ backend service
• cache data across DRAM and SSD transparently
• replace a multi-gigabyte evictable hash map with a scalable cache
• benchmark and compare cache eviction policies like LRU, TinyLFU, and 2Q
• evaluate hardware trade-offs between DRAM-only and hybrid DRAM+SSD caches
• persist cache contents across process restarts via shared memory
• stress test cache implementations for correctness and performance issues

When to choose

• your service caches gigabytes of data and needs strict memory bounds
• you need concurrent, zero-copy cache access with low overhead
• you want automatic pool rebalancing and workload-adaptive tuning
• you need to evaluate cache heuristics or hardware choices with realistic workloads

When to avoid

• you need a distributed cache with consistency or sharding across hosts
• you want a simple drop-in key-value store without C++ integration work
• your workload is small enough for a plain in-memory map
• you need a standalone cache server rather than an embedded library

Facets

library · maturity active

caching benchmarking concurrency databases performance backend developer-tools cpp self-hosted in-process-cache dram ssd-caching hybrid-cache eviction-policies thread-safe facebook cache-persistence linux

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