Alessandro Biondi

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Engine control systems include computational activities that are triggered at predetermined angular values of the crankshaft, and therefore generate a workload that tends to increase with the engine speed. To cope with overload conditions, a common practice adopted by the automotive industry is to design such angular tasks with a set of modes that switch at(More)
Engine control applications require the execution of tasks activated in relation to specific system variables, such as the crankshaft rotation angle. To prevent possible overload conditions at high rotation speeds, such tasks are designed to vary their functionality (hence their computational requirements) for different speed ranges. Modeling and analyzing(More)
Sharing resources in hierarchical real-time systems implemented with reservation servers requires the adoption of special budget management protocols that preserve the bandwidth allocated to a specific component. In addition, blocking times must be accurately estimated to guarantee both the global feasibility of all the servers and the local schedulability(More)
—The fast evolution of multicore systems, combined with the need of sharing the same platform for independently developed software, demands for new methodologies and algorithms that allow resource partitioning, while guaranteeing the isolation of concurrent applications. Unfortunately, a major problem that can break the isolation property of concurrent(More)
—Engine control applications include software tasks that are triggered at predetermined angular values of the crankshaft, thus generating a computational workload that varies with the engine speed. To avoid overloads at high rotation speeds, these tasks are implemented to self adapt and reduce their computational demand by switching mode at given rotation(More)
Modularity and hierarchical-based design are crucial features that need to be supported in complex embedded systems characterized by multiple applications with timing requirements. Resource reservation is a powerful scheduling mechanism for achieving such goals and providing temporal isolation among different real-time applications. When different(More)
New programming models have been proposed to exploit the parallelism of modern computing architectures. Also in the real-time domain more detailed task models are under evaluation to provide a tighter analysis of parallel application with precedence and timing constraints. This paper presents two schedulability tests based on Response Time Analysis for(More)
—Engine control applications typically include computational activities consisting of periodic tasks, activated by timers, and engine-triggered tasks, activated at specific angular positions of the crankshaft. Such tasks are typically managed by a OSEK-compliant real-time kernel using a fixed-priority scheduler, as specified in the AUTOSAR standard adopted(More)