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开放式实时嵌入式系统中多类型实时任务并存和资源受限的情况给实时调度机制带来了新的需求和挑战。通过引入准入控制、资源管理、调度服务器、自适应调节机制等,提出了一个形式化的自适应调度模型。它能适应开放计算环境的不确定性,有控制地接受不同类型任务的运行;可根据系统资源和任务需求的最新变换情况计算带宽变化,自适应地调节任务的优先等级,使得系统运行在最优的实时性能上;该模型在某航空机载系统设计中得到了实际应用,同其它类似系统相比,该模型的应用提高了系统的调度性和系统稳定性。
Open real-time embedded systems, multi-type real-time tasks coexist and limited resources to the real-time scheduling mechanism has brought new needs and challenges. By introducing admission control, resource management, scheduling server and adaptive adjustment mechanism, a formalized adaptive scheduling model is proposed. It can adapt to the uncertainty of open computing environment and can control the operation of different types of tasks in a controlled manner. It can calculate the bandwidth changes according to the latest transformation of system resources and task demands, and adjust the priority of tasks adaptively to make the system run at the most Excellent real-time performance. The model has been applied in the design of aero-on-board system. Compared with other similar systems, this model improves the system scheduling and system stability.