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Change-Id: Id53ee875ee31b43a6d7bd3f180260276ddd4f8b9
GitHub-Last-Rev: c90e386967
GitHub-Pull-Request: golang/go#76664
Reviewed-on: https://go-review.googlesource.com/c/go/+/725922
Reviewed-by: Mark Freeman <markfreeman@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Bypass: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
28 lines
1.2 KiB
Markdown
28 lines
1.2 KiB
Markdown
## Runtime {#runtime}
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### New garbage collector
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The Green Tea garbage collector, previously available as an experiment in
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Go 1.25, is now enabled by default after incorporating feedback.
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This garbage collector’s design improves the performance of marking and
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scanning small objects through better locality and CPU scalability.
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Benchmark results vary, but we expect somewhere between a 10—40% reduction
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in garbage collection overhead in real-world programs that heavily use the
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garbage collector.
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Further improvements, on the order of 10% in garbage collection overhead,
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are expected when running on newer amd64-based CPU platforms (Intel Ice
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Lake or AMD Zen 4 and newer), as the garbage collector now leverages
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vector instructions for scanning small objects when possible.
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The new garbage collector may be disabled by setting
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`GOEXPERIMENT=nogreenteagc` at build time.
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This opt-out setting is expected to be removed in Go 1.27.
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If you disable the new garbage collector for any reason related to its
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performance or behavior, please [file an issue](/issue/new).
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### Faster cgo calls
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<!-- CL 646198 -->
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The baseline runtime overhead of cgo calls has been reduced by ~30%.
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