} else {
		t.Logf("bias: abs(%f) < %f", bias, threshold)
	}
}

// blockFrequentShort produces 100000 block events with an average duration of
// rate / 10.
func blockFrequentShort(rate int) {
	for i := 0; i < 100000; i++ {
		blockevent(int64(rate/10), 1)
	}
}

// blockFrequentShort produces 10000 block events with an average duration of
// rate.
func blockInfrequentLong(rate int) {