I stayed at a place once for over a week, they had two elevators, but one of them had a sign on it saying it was out of service the entire time I was staying there. I did wonder at the time if it reverted to a “single elevator” algorithm, or if instead it just ran a kind of degraded “two elevators but one isn’t keeping up its end of the bargain” algorithm 😛

Wow. I always assumed DD systems were significantly superior.

If you want to play around with different elevator algorithms, there’s Elevator Saga where you can code your own.

Cool article. Thanks for sharing