在能量收集信息物理融合系统(energy harvesting based cyber-physical systems,EHCPS)中,其能量管理体系结构不同于传统电池供电嵌入式系统,任务调度策略需要考虑能量收集单元的能量输出、电池的能量存储和计算任务的能量消耗.实时任...在能量收集信息物理融合系统(energy harvesting based cyber-physical systems,EHCPS)中,其能量管理体系结构不同于传统电池供电嵌入式系统,任务调度策略需要考虑能量收集单元的能量输出、电池的能量存储和计算任务的能量消耗.实时任务在满足能量约束的情况下,才能满足时间约束.传统抢占阈值调度的可调度性分析没有考虑任务的能量属性,其阈值分配算法也不适用于EHCPS.针对此问题,提出了一种能量相关抢占阈值调度策略(energy related preemption threshold scheduling,ERPT),在可调度性分析中融入任务能耗属性和能量补充能力,并给出了阈值分配算法,为抢占阈值调度在EHCPS中的应用提供了一种解决方法.通过与目前现有的2个经典调度策略进行比较,验证了ERPT策略能够有效减少任务抢占.展开更多
In hard real-time systems, schedulability analysis is not only one of the important means of guaranteeing the timelines of embedded software but also one of the fundamental theories of applying other new techniques, s...In hard real-time systems, schedulability analysis is not only one of the important means of guaranteeing the timelines of embedded software but also one of the fundamental theories of applying other new techniques, such as energy savings and fault tolerance. However, most of the existing schedulability analysis methods assume that schedulers use preemptive scheduling or non-preemptive scheduling. In this paper, we present a schedulability analysis method, i.e., the worst-case hybrid scheduling (WCHS) algorithm, which considers the influence of release jitters of transactions and extends schedulability analysis theory to timing analysis of linear transactions under fixed priority hybrid scheduling. To the best of our knowledge, this method is the first one on timing analysis of linear transactions under hybrid scheduling. An example is employed to demonstrate the use of this method. Experiments show that this method has lower computational complexity while keeping correctness, and that hybrid scheduling has little influence on the average worst-case response time (WCRT), but a negative impact on the schedulability of systems.展开更多
文摘在能量收集信息物理融合系统(energy harvesting based cyber-physical systems,EHCPS)中,其能量管理体系结构不同于传统电池供电嵌入式系统,任务调度策略需要考虑能量收集单元的能量输出、电池的能量存储和计算任务的能量消耗.实时任务在满足能量约束的情况下,才能满足时间约束.传统抢占阈值调度的可调度性分析没有考虑任务的能量属性,其阈值分配算法也不适用于EHCPS.针对此问题,提出了一种能量相关抢占阈值调度策略(energy related preemption threshold scheduling,ERPT),在可调度性分析中融入任务能耗属性和能量补充能力,并给出了阈值分配算法,为抢占阈值调度在EHCPS中的应用提供了一种解决方法.通过与目前现有的2个经典调度策略进行比较,验证了ERPT策略能够有效减少任务抢占.
基金the National Natural Science Foundation of China (No. 60533040)the Hi-Tech Research and Development Program (863) of China (Nos. 2007AA010304 and 2007AA01Z129)the Key Scientific and Technological Project of Hangzhou Tech-nology Bureau, China (No. 20062412B01)
文摘In hard real-time systems, schedulability analysis is not only one of the important means of guaranteeing the timelines of embedded software but also one of the fundamental theories of applying other new techniques, such as energy savings and fault tolerance. However, most of the existing schedulability analysis methods assume that schedulers use preemptive scheduling or non-preemptive scheduling. In this paper, we present a schedulability analysis method, i.e., the worst-case hybrid scheduling (WCHS) algorithm, which considers the influence of release jitters of transactions and extends schedulability analysis theory to timing analysis of linear transactions under fixed priority hybrid scheduling. To the best of our knowledge, this method is the first one on timing analysis of linear transactions under hybrid scheduling. An example is employed to demonstrate the use of this method. Experiments show that this method has lower computational complexity while keeping correctness, and that hybrid scheduling has little influence on the average worst-case response time (WCRT), but a negative impact on the schedulability of systems.
