2024-07-22 12:44:49 -04:00
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## Runtime {#runtime}
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2024-12-04 19:22:51 +00:00
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<!-- go.dev/issue/54766 -->
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<!-- go.dev/cl/614795 -->
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<!-- go.dev/issue/68578 -->
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Several performance improvements to the runtime have decreased CPU overheads by
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2—3% on average across a suite of representative benchmarks.
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Results may vary by application.
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These improvements include a new builtin `map` implementation based on
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[Swiss Tables](https://abseil.io/about/design/swisstables), more efficient
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memory allocation of small objects, and a new runtime-internal mutex
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implementation.
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The new builtin `map` implementation and new runtime-internal mutex may be
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disabled by setting `GOEXPERIMENT=noswissmap` and `GOEXPERIMENT=nospinbitmutex`
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at build time respectively.
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