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检索条件"任意字段=15th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications"

共 2152 条记录，以下是301-310 订阅

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Combining Prefetch with Instruction Cache Locking in Multitasking real-time systems

Combining Prefetch with Instruction Cache Locking in Multita...

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16th ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Aparicio, Luis C. Segarra, Juan Rodriguez, Clemente Vinals, Victor Univ Zaragoza Dpt Informat & Ingn Sistemas Zaragoza Spain Univ Zaragoza Inst Invest Ingn Arag I3A Network Excellence High Performance & Embedded Ar Zaragoza Spain Univ Basque Country Dpt Arquitectura & Tecnol Comp Leioa Spain

ISBN: (纸本)9780769541556

In multitasking real-time systems it is required to compute the WCET of each task and also the effects of interferences between tasks in the worst case. this is complex with variable latency hardware usually found in the fetch path of commercial processors. Some methods disable cache replacement so that it is easier to model the cache behavior. Lock-MS is an ILP based method to obtain the best selection of memory lines to be locked in a dynamic locking instruction cache. In this paper we first propose a simple memory architecture implementing the next-line tagged prefetch, specially designed for hard real-time systems. then, we extend Lock-MS to add support for hardware instruction prefetch. Our results show that the WCET of a system with prefetch and an instruction cache with size 5% of the total code size is better than that of a system having no prefetch and cache size 80% of the code. We also evaluate the effects of the prefetch penalty on the resulting WCET, showing that a system without prefetch penalties has a worst-case performance 95% of the ideal case. this highlights the importance of a good prefetch design. Finally, the computation time of our analysis method is relatively short, analyzing tasks of 96 KB with 10(65) paths in less than 3 minutes.

关键词： WCET prefetch instruction cache

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Hybrid Pixel Encoding: An Effective Display Frame Compression Algorithm for HD Video Decoder

Hybrid Pixel Encoding: An Effective Display Frame Compressio...

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15th ieee international conference on Computational Science and Engineering (CSE) / 10th ieee/IFIP international conference on embedded and Ubiquitous computing (EUC)

作者： Li, Yifu Wang, Wenxiang Zhang, Guangfei Loongson Technol Corp Ltd Beijing 100190 Peoples R China Grad Univ Chinese Acad Sci Beijing 100149 Peoples R China Chinese Acad Sci ICT State Key Lab Comp Architect Beijing 100190 Peoples R China

ISBN: (纸本)9781467351652;9780769549149

High definition (HD) video decoder processes a great amount of data within a bounded time and thus requires high memory bandwidth. the memory bandwidth will dominate system performance, especially in embedded systems. In this paper, we propose a lossless hybrid display frame compression algorithm called HPE (Hybrid Pixel Encoding) for HD video decoder considering high compression performance and real time operation. the algorithm combines dictionary coding and run length coding to achieve a low compression ratio. We integrate the proposed design into an H. 264 decoder. Experimental results show that the proposed algorithm gains 67.7% of data reduction ratio on average when decoding 1080-HD video. It is much more effective than all previous works.

关键词： high definition video decoders memory bandwidth low compression ratio Compression algorithms embedded systems deceleration rate System performance pixel

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A Distributed computing Environment for embedded Control systems with time-Triggered and Event-Triggered Processing

A Distributed Computing Environment for Embedded Control Sys...

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14th ieee international conference on embedded and real-time computing systems and applications

作者： Itami, Yuichi Ishigooka, Tasuku Yokoyama, Takanori Musashi Inst Technol Setagaya Ku Tokyo 1588557 Japan

ISBN: (纸本)9780769533490

the paper presents a distributed computing environment for embedded control systems with time-triggered and event-triggered distributed processing. We have already presented a time-triggered distributed object model and a time-triggered distributed computing environment for embedded control systems. However there are many embedded control systems with time-triggered and event-triggered processing. In this paper we present two kinds of event-triggered distributed object models, a pure event-triggered distributed object model and a data-triggered distributed object model, in addition to the time-triggered distributed object model. We also present a distributed object computing environment based on a time-division scheduling for the mixed architecture with time-triggered and event-triggered distributed processing. the time division scheduling divides an execution cycle into a time-triggered processing segment and a non-time-triggered processing segment. the time-triggered distributed processing is executed in the former segment, and the event-triggered distributed processing is executed in the latter segment. the distributed object computing environment consists of a real-time operating system with the time division scheduling and distributed computing middleware to support the three kinds of distributed object models. We provide a development environment that generates stubs and configuration data to build distributed control systems.

关键词： Distributed parameter control systems

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Integration of Data Distribution Service into Partitioned real-time embedded systems 15

Integration of Data Distribution Service into Partitioned Re...

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15th ieee conference on Industrial Electronics and applications (ICIEA)

作者： Song, Boyang Hu, Xiaoguang Xiao, Jin Zhang, Guofeng Wang, Shuo Zhou, Qing Beihang Univ State Key Lab Virtual Real Technol & Syst Beijing 100191 Peoples R China China China Natl Aeronaut Radio Elect Res Inst Shanghai 200233 Peoples R China

ISBN: (纸本)9781728151694

Data Distribution Service (DDS) middleware facilitates interoperability and portability of components by building the underlying communication network in mixed-criticality systems with real-time requirements, especially those in conformity with Future Airborne Capability Environment (FACE) technical standard. Partitioning is the key technology permitting applications with different levels of criticality to execute in a same hardware on strict isolation in time and space. A system architecture is proposed to realize the integration of DDS into partitioned real-time embedded systems compliant with ARINC-653 specification. the architecture allows communications among applications through the DDS middleware, whether they are executed in a partitioned system or not. then an Unmanned Aerial Vehicle (UAV) combat scenario is simulated to exemplify - the design feasibility. Evaluation tests show the communication stability can be obtained whether an ARINC-653 compliance system interconnect with heterogeneous systems or homogeneous systems. Based on the reliable configuration, the average communication time is stable at around 272.0 mu s in former situation and 281.32 mu s in the latter. And the specific performance difference between the two cases is further analyzed.

关键词： Middleware ARINC-653 Mixed-criticality systems Data Distribution Service

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Preliminary Modeling of Energy-Aware Integrated Allocations in Robotic Mobile Fulfillment systems 30

Preliminary Modeling of Energy-Aware Integrated Allocations ...

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30th ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Kyung, KyuJin Gangadharan, Deepak Kim, BaekGyu DGIST Daegu South Korea IIIT Hyderabad Hyderabad India

ISBN: (纸本)9798350387964;9798350387957

the Robotic Mobile Fulfillment System (RMFS) is an automated technology to fulfill various types of orders (e.g.,vehicle assembly) in modern warehouses or factories. In particular, battery-equipped mobile robots move racks that contain various components (Stock Keeping Unit) by visiting replenishment or picking stations to complete orders. We formulate the preliminary system model to optimize the order throughput and energy consumption of mobile robots, which consists of (i) rack allocation, (ii) task allocation, and (iii) route routing.

关键词： Energy utilization

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Duration-based Instruction Cache Locking 30

Duration-based Instruction Cache Locking

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30th ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Lawand, Wafic Pellizzoni, Rodolfo Univ Waterloo Waterloo ON Canada

ISBN: (纸本)9798350387964;9798350387957

Cache locking is a commonly used mechanism to improve both performance and predictability for embedded programs. Dynamic cache locking methods proposed in the literature, where the locked content is modified during execution, require inserting locking and unlocking instructions in the program's code. In this paper, we introduce a novel hardware mechanism that leverages the LRU age bits to perform duration-based locking. Our proposed mechanism dynamically locks and unlocks cache lines for different durations at run-time, without the need to modify the program's code. We further devise a heuristic that analyzes a program's loop structure and selects the set of addresses to be locked in a L1 instruction cache alongside their locking durations. Evaluation results show that our duration-based locking mechanism achieves comparable results to the dynamic approach while substantially reducing the initialization overhead and avoiding program code modifications.

关键词： embedded systems Instruction Cache Locking

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A comprehensive context model for next generation ubiquitous computing applications

A comprehensive context model for next generation ubiquitous...

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11th international conference on embedded and real-time computing systems and applications

作者： Sun, J Wu, ZH Zhejiang Univ Coll Comp Sci Hangzhou 310027 Zhejiang Peoples R China

ISBN: (纸本)0769523463

In recent years, there has been much research on ubiquitous computing, including context aware computing that is an important field in ubiquitous computing. the primary focus of this paper is on context modeling. We study the characteristics of context and so the requirements on the modeling. Besides, we also take into account the development requirements of next generation context-aware application. We study the context modeling approaches of some famous existing projects and find that few models meet all these requirements. In this paper, we propose a comprehensive model, which meets these requirements. We implement this model in a middleware called Scudware.

关键词： context model context aware middleware ubiquitous computing

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IoT-based Seismic Hazard Detection in Coal Mines using Grey systems theory 15

IoT-based Seismic Hazard Detection in Coal Mines using Grey ...

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15th ieee international Wireless Communications and Mobile computing conference (ieee IWCMC)

作者： Ghosh, Nimisha Banerjee, Indrajit Siksha O Anusandhan Deemed Univ Inst Tech Educ & Res Dept Comp Sci & Informat Technol Bhubaneswar Odisha India Indian Inst Engn Sci & Technol Dept Informat Technol Sibpur Howrah India

ISBN: (纸本)9781538677476

Internet of things enabled applications are an amalgamation of many physical devices embedded with electronics, sensors etc. whose data can be successfully used for monitoring of nature induced hazards. One such special case of hazard is seismic hazard which is a common occurrence in underground mines. It is very hard to detect and predict and can thus be compared to an earthquake. Detection of a seismic hazard is therefore of utmost importance for a healthy mining activity. this work presents a Grey systems theory based classification method for the detection of seismic hazard in underground mines. the proposed approach has been applied on a real life data set to verify its viability. the simulation results show that the proposed approach showcases better performance than some of the state-of-the-art machine learning techniques.

关键词： Classification Grey theory Internet of things (IoT) Monitoring Seismic hazard

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Garbage collector scheduling in dynamic, multiprocessor real-time systems

Garbage collector scheduling in dynamic, multiprocessor real...

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12th international conference on embedded and real-time computing systems and applications

作者： Na, Chewoo Cho, Hyeonjoong Ravindran, Binoy Jensen, E. Douglas Virginia Tech ECE Dept Blacksburg VA 24061 USA Mitre Corp Bedford MA 01730 USA

ISBN: (纸本)0769526764

We present a garbage collector scheduling algorithm for dynamic multiprocessor real-time systems called GCMUA. the algorithm considers mutator activities that are subject to time/utility function time constraints, stochastic execution-time and memory demands, and overloads. We prove that GCMUA probabilistically lower bounds each mutator's accrued utility, lower bounds the total accrued utility, and upper bounds the assurances' sensitivity to variations in execution-time and memory demand estimates. Our simulation results confirm our analytical results.

关键词： real time systems

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Interrupting real-time IoT Tasks: How Bad Can It Be to Connect Your Critical embedded System to the Internet? 39

Interrupting Real-Time IoT Tasks: How Bad Can It Be to Conne...

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39th ieee international Performance computing and Communications conference (IPCCC)

作者： Behnke, Ilja Pirl, Lukas thamsen, Lauritz Danicki, Robert Polze, Andreas Kao, Odej Tech Univ Berlin Berlin Germany Hasso Plattner Inst Potsdam Germany

ISBN: (纸本)9781728198293

embedded systems have been used to control physical environments for decades. Usually, such use cases require low latencies between commands and actions as well as a high predictability of the expected worst-case delay. To achieve this on small, low-powered microcontrollers, real-time Operating systems (RTOSs) are used to manage the different tasks on these machines as deterministically as possible. However, with the advent of the Internet of things (IoT) in industrial applications, the same embedded systems are now equipped with networking capabilities, possibly endangering critical real-time systems through an open gate to interrupts. this paper presents our initial study of the impact network connections can have on real-time embedded systems. Specifically, we look at three aspects: the impact of network-generated interrupts, the overhead of the related networking tasks, and the feasibility of sharing computing resources between networking and real-time tasks. We conducted experiments on two setups: One treating NICs and drivers as black boxes and one simulating network interrupts on the machines. the preliminary results show that a critical task performance loss of up to 6.67% per received packet per second could be induced where lateness impacts of 1% per packet per second can be attributed exclusively to ISR-generated delays.

关键词： Internet of things real-time Interrupts Cyber Physical systems embedded systems

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