FreeLRU - A GC-less, fast and generic LRU hashmap library for Go by elastic
About FreeLRU - A GC-less, fast and generic LRU hashmap library for Go
From the project's README at github.com/elastic/go-freelru. Lightly cleaned for readability; for the full source see the upstream repo.
[](https://pkg.go.dev/github.com/elastic/go-freelru) [](https://goreportcard.com/report/github.com/elastic/go-freelru) [](https://coveralls.io/github/elastic/go-freelru?branch=main) [](https://github.com/avelino/awesome-go)
FreeLRU allows you to cache objects without introducing GC overhead. It uses Go generics for simplicity, type-safety and performance over interface types. It performs better than other LRU implementations in the Go benchmarks provided. The API is simple in order to ease migrations from other LRU implementations. The function to calculate hashes from the keys needs to be provided by the caller. : Single-threaded LRU hashmap
is a single-threaded LRU hashmap implementation. It uses a fast exact LRU algorithm and has no locking overhead. It has been developed for low-GC overhead and type-safety. For thread-safety, pick one of or or do locking by yourself. Comparison with other single-threaded LRU implementations Get (key and value are both of type ) ``` BenchmarkFreeLRUGet 73456962 15.17 ns/op 0
Health score breakdown
6-dimension composite. See methodology for formula and weights.
Adoption signals
Real-world usage data, pulled from each registry. The bigger the numbers, the more battle-tested the project.
| Signal | Value | Source |
|---|---|---|
| GitHub stars | 265 | github.com/elastic/go-freelru |
| GitHub forks | 22 | github.com/elastic/go-freelru |
Release & maintenance
Is this project actively maintained, or about to die? Check the recency of last commit and last release.
| Project age | 3.4 years | since Dec 2022 |
| Last commit | 5 days ago | May 1, 2026 |
| Releases shipped | 14 | last: 1.5 years ago |
| Security policy | SECURITY.md | declared by maintainers |
Self-hosting cost across providers
Detected requirements: 4GB RAM, 40GB disk minimum. Cheapest plan per provider that meets the requirement.
| Provider | Plan | Specs | Monthly | |
|---|---|---|---|---|
| hetzner | CAX11 | 2c · 4GB · 40GB | $4.13 USD | Deploy → |
| vultr | VC2 | 1c · 1GB · 25GB | $5 USD | Deploy → |
| linode | Nanode 1GB | 1c · 1GB · 25GB | $5.12 USD | Deploy → |
| digitalocean | Basic Regular 1GB | 1c · 1GB · 25GB | $6 USD | Deploy → |
Ready to self-host FreeLRU - A GC-less, fast and generic LRU hashmap library for Go?
Spin up a hetzner CAX11 (4GB RAM, 40GB disk) for $4.13/mo and follow the project's official install docs.
Data last refreshed May 7, 2026.
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