Grokking Concurrency in Go
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Benchmarking Concurrent Code

func BenchmarkMutexParallel(b *testing.B) {
	var c MutexCounter
	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			c.Inc() // lock, add one, release the lock
		}
	})
}

Part of the output of go test -bench=. -cpu=1,4,16 on one machine with 16 logical CPUs:

BenchmarkMutexParallel         	304150128	         3.733 ns/op
BenchmarkMutexParallel-4       	100000000	        10.03 ns/op
BenchmarkMutexParallel-16      	30417865	        41.49 ns/op

The benchmark increments a counter that is protected by a mutex. With one goroutine, an increment cost about 4 nanoseconds

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