The mutex was 68 times faster, until I added work
One goroutine: 2.5 ns for the mutex, 172.6 ns for the channel. Sixteen goroutines with real work: the channel wins by less than the harness's own error.
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Concurrency in practice
Channels, sync, context, and the patterns that survive production rather than the ones that only survive blog posts.
Articles in “Concurrency in practice”
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