The Green Tea Garbage Collector

This post introduces Green Tea, a new experimental garbage collector in Go 1.25 that significantly reduces GC overhead for many workloads.

• •Enable via GOEXPERIMENT=greenteagc at build time; already production-tested at Google
• •Most workloads see ~10% reduction in GC time; some workloads see up to 40% improvement
• •Planned to become the default GC in Go 1.26 based on current data
• •Go's GC uses a mark-sweep algorithm: mark phase traces object graph from roots (globals/locals), sweep phase frees unvisited objects
• •GC runs concurrently and in parallel with user code; objects are tracked per-page using seen bits for metadata

This summary was automatically generated by AI based on the original article and may not be fully accurate.