1 KiB
Runtime
New garbage collector
The Green Tea garbage collector, previously available as an experiment in Go 1.25, is now enabled by default after incorporating feedback.
This garbage collector’s design improves the performance of marking and scanning small objects through better locality and CPU scalability. Benchmark results vary, but we expect somewhere between a 10—40% reduction in garbage collection overhead in real-world programs that heavily use the garbage collector. Further improvements, on the order of 10% in garbage collection overhead, are expected when running on newer amd64-based CPU platforms (Intel Ice Lake or AMD Zen 4 and newer), as the garbage collector now leverages vector instructions for scanning small objects when possible.
The new garbage collector may be disabled by setting
GOEXPERIMENT=nogreenteagc at build time.
This opt-out setting is expected to be removed in Go 1.27.
If you disable the new garbage collector for any reason related to its
performance or behavior, please file an issue.