Notes from Optimizing CPU-Bound Go Hot Paths
Summary
The article analyzes CPU-bound optimization in Go, highlighting how idiomatic abstractions like generics, interfaces, and closures can hinder inlining and degrade hot-path performance. It presents benchmark comparisons showing substantial throughput differences between concrete and generic/interface/closure approaches, and discusses assembly-level implications. The piece also covers Go-specific limitations (lack of prefetch intrinsics, inlining controls, BCE, layout sensitivity) and offers practical strategies (code duplication with codegen, selective inlining, and assembly) for achieving performance gains, while noting maintenance trade-offs.