How the Go runtime implements maps efficiently (without generics)
High-signal explanation of Go map implementation details useful for performance reasoning, not correctness contracts.
High-signal explanation of Go map implementation details useful for performance reasoning, not correctness contracts.
- Author: Dave Cheney
- Authority: community
- Kind: article
- URL: https://dave.cheney.net/2018/05/29/how-the-go-runtime-implements-maps-efficiently-without-generics
What it covers
- bucketed map implementation
- performance tradeoffs
- internal behavior relevant to profiling
Why authoritative
Widely cited technical write-up by a long-time Go contributor focused on runtime-level map behavior.
Use when
- how are Go maps implemented internally
- why is this map-heavy Go code slow
- should map internals affect this Go optimization
Keywords
- map internals, hash map, runtime, buckets, performance