EvoSMS: An Event-Oriented Simulation Method for Multi-Core Real-Time Scheduling

In this paper, an event-oriented simulation analysis approach was established for the schedulability analysis of multi-core embedded systems. To the best of our knowledge, this work is the first to introduce an event-oriented simulation strategy into multi-core processor schedulability analysis. The proposed method transforms the conventional step-by-step simulation into a jump-based simulation process, thereby reducing redundant system state updates and improving computational efficiency. Task execution is abstracted as a time-axis folding operation, and two algorithms, RBTF and PBTF, are developed to optimize event generation and management, effectively lowering the algorithmic complexity of the simulation. Furthermore, to resolve core-mapping conflicts arising in global scheduling during jump-based simulation, a time-axis-unfolding-based dynamic core-mapping algorithm is proposed. By incorporating a time interval recycling mechanism and a priority inheritance algorithm, this method ensures correct job-to-core assignment and enables precise response time analysis under global scheduling policies. This approach reduced the simulation time by 96.24% on average while guaranteeing the accuracy and soundness of the analysis. It is primarily applicable to periodic tasks with implied deadlines, and future work will explore extending this method to support sporadic tasks and tasks with arbitrary deadlines.