Practical Aspects of Slot-Based Task-Splitting Dispatching in Its Schedulability Analysis

Consider the problem of scheduling a set of sporadic tasks on a multiprocessor system to meet deadlines using a task splitting scheduling algorithm. Task-splitting (also called semi partitioning) scheduling algorithms assign most tasks to just one processor but a few tasks are assigned to two or more processors, and they are dispatched in a way that ensures that a task never executes on two or more processors simultaneously. A certain type of task-splitting algorithms, called slot-based task-splitting, is of particular interest because of its ability to schedule tasks at high processor utilizations. We present a new schedulability analysis for slot-based task-splitting scheduling algorithms that takes the overhead into account and also a new task assignment algorithm.