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A discrete scheduling algorithm basing on DP-Wrap(DDP) for multiprocessor real-time systems is proposed in this paper. As fairness is a popular concept used in most of the published optimal algorithms(e.g., Pfair, Bfair), many of the scheduling produced by these algorithms leads to much run-time overhead such as preemptions and migrations. Meanwhile, many of the scheduling algorithms(e.g., LLREF,...
The main challenge for embedded real-time systems, especially for mobile devices, is the trade-off between system performance and energy efficiency. Through studying the relationship between energy consumption, execution time and completion probability of tasks on heterogeneous multi-core architectures, we propose an Accelerated Search algorithm based on dynamic programming to obtain a combination...
Debugging multi-task real-time VxWorks applications is tedious and time-consuming for developers. The non-determinism within the application execution makes the developers hard to reproduce a failure.1As a result, the developers cannot perform cyclic debugging easily on these real-time applications. Replay debugging techniques can help developers to replay the failure scenario with determinism. In...
The main challenges for embedded real-time systems which use battery as their power supply are both to satisfy the requirements of real-time systems and minimize the energy consumption. This paper studies the energy saving problem for DAG (Directed Acyclic Graph) tasks in soft real-time systems with heterogeneous multicore processors. Since soft real-time systems can tolerate occasional time violations...
Cache is an important component existing in modern computer system to bridge the performance gap between the fast CPU and the slow memory system. A variety of cache optimization technologies and mechanisms are proposed to improve the cache performance, such as instruction cache prefetching. Most instruction prefetching mechanisms existing are proposed to improve the average-case cache performance...
Aimed at the needs for scheduling real-time tasks in the environment of open real-time system and embedded system, a scheduling mechanism based on messages has been suggested and applied on the Xen virtual machine, and a Multi-Real-Time-Task model based on VCPU is established. Influence on the real-time scheduling is analyzed and solutions will be given. Experiment results prove that scheduling based...
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