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Commit 795d95d

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mknyszekgopherbot
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doc/next: add release notes for runtime and sync
Also, move the weak package heading to the end; it currently overlaps with 1-osroot.md in the sort order. For #68545. Change-Id: Ia26ae511eaab7c8762e42d1593ac2197d25bbadb Reviewed-on: https://go-review.googlesource.com/c/go/+/633599 Reviewed-by: David Chase <drchase@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Michael Knyszek <mknyszek@google.com>
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‎doc/next/4-runtime.md‎

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## Runtime {#runtime}
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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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The implementation of [sync.Map] has been changed, improving overall performance
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and resolving some long-standing issues.
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If you encounter any problems, set `GOEXPERIMENT=nosynchashtriemap` at build
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time to switch back to the old implementation and please [file an
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issue](/issue/new).

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