The two methods demonstrate a scenario in which five messages are input to a message queue and the one with the highest priority is taken out of the queue and processed.

When you use complex algorithms, requests are distributed based on, for instance, how well a server is performing, what kind of hardware the server has, and how customer priority is processed.

On the other hand, there is nothing that prevents an underfed thread in the "multiple-time-slices" approach from boosting its own priority dynamically.