A Workload-oriented Programming Model for Temporal Isolation with VBS

Workload-oriented programming is a design methodology for specifying throughput and latency of real-time software processes in temporal isolation from each other on the level of individual process actions such as system or procedure calls. The key programming abstraction is that the type and amount of workload involved in executing a process action fully determines the action’s response time, independently of any previous or concurrent actions. The model enables sequential and concurrent real-time process composition while maintaining predictability of each action’s workload-determined real-time behavior. We show how the model can be implemented using variable-bandwidth servers (VBS) and discuss performance-related options for adequately configuring servers in the presence of non-zero scheduler overhead.