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sync.Map: Two Maps, A Miss Counter and Why Read-Mostly Wins

Oct 21, 2026 16 min read Jay Hubbert

sync.Map’s old read/dirty/misses design is gone: the type is now a wrapper around a 16-way hash trie whose reads take no locks at all, and whose doc still tells you to use it only …

GoInternalsSyncConcurrencyPerformance

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