On the Placement of Reservations into Job Schedules

We present a new method for determining placements of flexible reservation requests into a schedule. For each considered placement the what-if method inserts a placeholder into the schedule and simulates the processing of batch jobs currently known to the system. Each placement is evaluated wrt. well-known scheduling metrics. This information may be used by a Grid reservation service to choose the most likely successful placement of a reservation. According to the results of extensive simulations, the what-if method grants more reservations and improves the performance of local jobs compared to our previously used load method.