In one embodiment, a method includes empirically analyzing, by a computer cluster comprising a plurality of computers, a set of active reservations and a current set of consumable resources belonging to a class of consumable resources. Each active reservation is of a managed task type and comprises a group of one or more tasks task requiring access to a consumable resource of the class. The method further includes, based on the empirically analyzing, clocking the set of active reservations each clocking cycle. The method also includes, responsive to the clocking, sorting, by the computer cluster, a priority queue of the set of active reservations.