a recursive approach to end-to-end path latency computation in heterogeneous multiprocessor systems
This paper proposes a method for the derivation of end-to-end delays of applications that involve processing on multiple components in a heterogeneous multiprocessor system. The rocedure precisely captures the pipelined and parallel processing of multiple events along an application path by accurately capturing the resource timing and avoiding the pay-bursts-only-once problem. Both time-triggered and event-triggered task activation schemes with arbitrary event patterns are supported. In contrast to previous work, complex application topologies are allowed: The approach considers path forking and merging, as well as functional cycles and non-functional cyclic dependencies. The basis for the proposed method is an iterative compositional performance analysis, that allows computing event models in such systems. Based on the event models and local performance abstractions we propose a recursive approach to the derivation of the worst-case latency.
path latency multiprocessor real-time