Evaluation of runtime monitoring methods for real-time event streams

Runtime monitoring is of great importance as a safe guard to guarantee the correctness of system runtime behaviors. Two new methods, i.e., dynamic counters and l-repetitive function, are recently developed to tackle the runtime monitoring for hard real-time systems. This paper investigates in depth these two newly developed runtime monitoring methods, trying to evaluate and identify their strengths and weaknesses. Representative scenarios are used as our case studies to quantitatively demonstrate our comparisons. We also provide FPGA implementations and resource usages of both methods.