wg.Add(1)
	go func() {
		defer wg.Done()
		ch := ub.Get()
		for i := 0; i < numWriters*numWrites; i++ {
			r := <-ch
			reads = append(reads, r)
			ub.Load()
		}
	}()

	wg.Add(numWriters)
	for i := 0; i < numWriters; i++ {
		go func(index int) {
			defer wg.Done()
			for j := 0; j < numWrites; j++ {
				ub.Put(index)
			}
		}(i)
	}

	wg.Wait()
	sort.Ints(reads)

		f(b, 3, true)
	})
}

func BenchmarkBuildString_Builder(b *testing.B) {
	benchmarkBuilder(b, func(b *testing.B, numWrite int, grow bool) {
		for i := 0; i < b.N; i++ {
			var buf Builder
			if grow {
				buf.Grow(len(someBytes) * numWrite)
			}
			for i := 0; i < numWrite; i++ {
				buf.Write(someBytes)
			}
			sinkS = buf.String()
		}
	})
}