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Virtualization provides an excellent solution to resolve the portability, maintainability, development, and utilization problems in many system designs. In this paper, we are interested in energy-efficient designs for platform virtualization. In particular, we explore the computing resource mapping and the energy consumption relationship between virtual cores and physical cores when timing constraints...
In the past decade, energy-efficient real-time task scheduling has been widely explored in the form of various optimization problems. This paper considers energy-efficient real-time task synchronization protocols and the overhead of frequency switching in real systems design. We propose the concept of frequency locking to better manage the cost in frequency switching. To minimize the energy consumption...
Dynamic voltage scaling (DVS) has been widely adopted to reduce the energy consumption resulting from the dynamic power of modern processors. However, while the leakage power resulting from the leakage current becomes significant, how to aggregate the idle time to turn processors to the sleep or dormant modes is crucial in reducing the overall energy consumption. Moreover, for systems with non-DVS...
Nowadays more and more singers published songs in Internet. The music charts can help people choose the popular songs, and also tell people the popularity of singers and songs. There are kinds of music charts. Each kind of charts has its particular criterion. Traditional commercial charts are mostly decided on the selling of CDs. With the development of Internet, some new music charts are developed...
Nowadays, more and more singers published various songs. There are about 50,000 songs in the Internet. The songs are refreshed everyday, so we need a real-time chart of music. In this paper, our study is based on the real-time search charts of music. We studied the algorithm of the charts and analyzed the ranking of the charts. According to the ranking of the charts, we got some special characters...
As application complexity increases, modern embedded systems have adopted heterogeneous processing elements to enhance the computing capability or to reduce the power consumption. The heterogeneity has introduced challenges for energy efficiency in hardware and software implementations. This paper studies how to partition real-time tasks on a platform with heterogeneous processing elements (processors)...
A real time kernel is an essential component for embedded systems. This research designs a real time operating system for the realization of home monitoring and controlling via power lines or infrared media. We also design a unified medium access control (MAC) protocol so that it is easy for swapping and including different hardware transceivers, such as Bluetooth. The designed platform is low cost,...
In the past decades, a number of research results have been reported for energy-efficient task scheduling over uniprocessor and multiprocessor environments. While researchers have started the exploring of slack reclaiming for tasks during run time, little work has been done for multiprocessor cases. This paper proposes a set of multiprocessor energy-efficient task scheduling algorithms with different...
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