rate.Sometimes vs time.Ticker

result.txt

goos: darwin
goarch: arm64
pkg: ids-rewrite-experiment
BenchmarkSometimes/ticker-8         	387814022	         2.915 ns/op
BenchmarkSometimes/sometimes-8      	44387656	        27.03 ns/op

sometimes_test.go

var sink int

func BenchmarkSometimes(b *testing.B) {
	fn := func() { sink++ }
	b.Run("ticker", func(b *testing.B) {
		ticker := time.NewTicker(time.Second)
		defer ticker.Stop()
		for i := 0; i < b.N; i++ {
			if i == 0 {
				fn()
			} else {
				select {
				case <-ticker.C:
					fn()
				default:
				}
			}
		}
	})
	b.Run("sometimes", func(b *testing.B) {
		s := rate.Sometimes{First: 1, Interval: time.Second}
		for i := 0; i < b.N; i++ {
			s.Do(fn)
		}
	})
}