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检索条件"任意字段=11th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications"

共 2194 条记录，以下是121-130 订阅

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Improving GPOS real-time Responsiveness using vCPU Migration in an embedded Multicore Virtualization Platform

Improving GPOS Real-time Responsiveness using vCPU Migration...

引用

ieee 19th international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Lin, Tsung-Han Mitake, Hitoshi Nakajima, Tatsuo Waseda Univ Dept Comp Sci & Engn Tokyo Japan

ISBN: (纸本)9781479908509

In this paper, a vCPU (virtual CPU) migration mechanism in order to improve real-time responsiveness in a GPOS (General Purpose Operating System) is presented in the embedded multicore virtualization platform and can also be applied to CPS environment. In a GPOS/RTOS (real time Operating System) virtualization system nowadays, tasks in GPOS, however, also need some degree of real-time services from the system. Unfortunately, in a traditional virtualization platform, a virtualization layer always gives RTOS vCPU higher priority and preempts the execution of GPOS. therefore, a kernel module in the GPOS is added in our virtualization system to export and boost a GPOS vCPU contexts which needs higher priority against RTOS vCPU. At the same time, in order not to sacrifice the performance of the victim RTOS vCPU, a vCPU migration mechanism is added to our virtualization system, and migrates the RTOS vCPU to a low-loading CPU when this vCPU is preempted. Performance improvement of GPOS's real-time responsiveness is also given while a detailed analysis of the overhead of the RTOS vCPU is performed as well.

关键词： Virtualization

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A Space-Based Wear Leveling for PCM-Based embedded systems

A Space-Based Wear Leveling for PCM-Based Embedded Systems

引用

ieee 19th international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Long, Linbo Liu, Dou Hu, Jingtong Gu, Shouzhen Zhuge, Qingfeng Shau, Edwin H. -M. Chongqing Univ Coll Comp Sci Chongqing 630044 Peoples R China Univ Texas Dallas Dept Comp Sci Richardson TX 75080 USA

ISBN: (纸本)9781479908509

Phase change memory (PCM) has emerged as a promising candidate to replace DRAM in embedded systems. However, it can only sustain a limited number of write operations. To solve this issue, this paper proposes a novel and effective wear-leveling technique in software level to prolong the lifetime of PCM-based embedded systems. A polynomialtime algorithm, Multi-Space Wear Leveling Algorithm (MWL), is proposed to achieve effective wear-leveling. the experimental results show our technique can greatly extend the lifetime of PCM-based embedded systems compared with the previous work. Compared with the method without adopting wear-leveling, it introduces no more than 0.7% extra writes and 0.6% running overhead.

关键词： phase change memory wear-leveling endurance non-volatile memory embedded systems

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Mode Transition for Online Scheduling of Adaptive real-time systems on Multiprocessors

Mode Transition for Online Scheduling of Adaptive Real-Time ...

引用

1st international Workshop on Cyber-Physical systems, Networks, and applications (CPSNA) held during 17th ieee international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Rattanatamrong, Prapaporn Fortes, Jose A. B. Univ Florida Dept Elect & Comp Engn Gainesville FL 32611 USA

ISBN: (纸本)9780769545028

this paper presents a novel online scheduling algorithm for scheduling real-time adaptive systems in which tasks may have distinct resource requirements for each of the systems' operating modes. Apart from prior work that considers only step-wise adaptation of tasks' resource utilization during mode transition, the proposed algorithm (named EAGLE-T) enables tasks to adapt their resource utilization progressively from one mode to another in a timely manner without causing any deadline miss. the upper bound of the delay and the drift between resource utilization achieved by EAGLE-T and the ideal scheduler during mode transition are provided. Performance evaluation shows that the progressive adaptation of EAGLE-T offers improved performance over a step-wise approach (average maximal-utilization drift and mode-transition delay are reduced by up to 68.75% and 32.16%, respectively). As the probability of a mode change or the number of tasks vary, empirical results show that the resource utilization achieved by tasks scheduled using EAGLE-T is within 56% to 90% of the desired utilization (compared to 11%-81% when the step-wise scheme is used).

关键词： real-time scheduling adaptive task systems mode transition multi-mode applications

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A Multiprocessor Server-Based Scheduler for Soft real-time Tasks with Stochastic Execution Demand

A Multiprocessor Server-Based Scheduler for Soft Real-Time T...

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作者： Mills, Alex F. Anderson, James H. Univ N Carolina Dept Stat & Operat Res Chapel Hill NC 27515 USA Univ N Carolina Dept Comp Sci Chapel Hill NC 27515 USA

ISBN: (纸本)9780769545028

We utilize a multiprocessor server-based approach to schedule a general class of soft real-time systems with stochastic execution demands, when bounded average-case tardiness is sufficient for schedulability. A key feature of the task model considered here is that the stochastic execution-time demands can have arbitrary amounts of dependence within pre-specified time intervals of bounded length. this is an important practical step forward from requiring complete independence of execution times between successive jobs of the same task. Our main result does not require the scheduler to know the execution time of each job in advance, and requires only average-case utilization to be bounded by the number of processors. this constraint is mild compared to constraints on worst-case utilization because in multiprocessor systems, worst-case execution times may be orders of magnitude higher than average-case execution times.

关键词： mulitprocessor real-time systems scheduling stochastic

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Scheduling support for guaranteed time services in ieee 802.15.4 low rate WPAN

Scheduling support for guaranteed time services in IEEE 802....

引用

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

作者： Yoo, Seong-Eun Kim, Daeyoung Pham, Minh-Long Doh, Yoonmee Choi, Eunchang Huh, Jae-Doo Information and Communications University Electronics and Telecommunications Research Institute

ISBN: (纸本)0769523463

We propose a real-time message scheduling algorithm which is applied to schedule periodic real-time messages in ieee 802.15.4 for LR-WPAN(Low Rate Wireless Personal Area Network). the standard allows GTSs (Guaranteed time Slots) in the optional use of a superframe structure in a beacon-enabled network to be used to exchange real-time messages. To utilize these features of the standard efficiently, a proper message scheduling algorithm is needed. the proposed off-line message scheduling algorithm which is based on a distance constrained scheduler generates the standard specific parameters including BO, SO, and GTS information to schedule the given message set. the algorithm is evaluated by simulation and the guaranteed time service using the schedule is implemented and evaluated on CC2420DB which is a prototyping platform including an ieee 802.15.4 compliant transceiver of Chipcon AS. © 2005 ieee.

关键词： Wireless telecommunication systems

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An Efficient Algorithm for Parametric WCET Calculation

An Efficient Algorithm for Parametric WCET Calculation

引用

15th ieee international conference on embedded and real-time computing systems and applications

作者： Bygde, Stefan Ermedahl, Andreas Lisper, Bjorn Malardalen Univ Sch Innovat Design & Technol Vasteras Sweden

ISBN: (纸本)9780769537870

Static WCET analysis is a process dedicated to derive a safe upper bound of the worst-case execution time of a program. In many real-time systems, however, a constant global WCET estimate is not always so useful since a program may behave very differently depending on its configuration or mode. A parametric WCET analysis derives the upper bound as formula rather than a constant. this paper presents a new efficient algorithm that can obtain a safe parametric estimate of the WCET of a program. this algorithm is evaluated on a large set of benchmarks and compared to a previous approach to parametric WCET calculation. the evaluation shows that the new algorithm, to the cost of some imprecision, scales much better and can handle more realistic programs than the previous approach.

关键词： real time systems

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Practical Energy-Aware Scheduling for real-time Multiprocessor systems

Practical Energy-Aware Scheduling for Real-Time Multiprocess...

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15th ieee international conference on embedded and real-time computing systems and applications

作者： Zeng, Gang Yokoyama, Tetsuo Tomiyama, Hiroyuki Takada, Hiroaki Nagoya Univ Grad Sch Informat Sci Chikusa Ku Furo Cho Nagoya Aichi 4648603 Japan Nanzan Univ Seto Aichi 4890863 Japan

ISBN: (纸本)9780769537870

Energy-aware real-time multiprocessor scheduling has been studied extensively so far. However, some of the constraints associated with the practical DVS applications have been ignored for simplicity. these constraints include discrete speed, idle power, inefficient speed, and application-specific power characteristics etc. this work targets energy-aware scheduling of periodic real-time tasks on the DVS-equipped multiprocessor systems with practical constraints. An adaptive minimal bound first-fit (AMBFF) algorithm with consideration of these realistic constraints is proposed for both dynamic-priority and fixed-priority multiprocessor scheduling. Simulation results on three commercial processor models show that our algorithm can save significantly more energy than existing algorithms.

关键词： energy optimization task scheduling multiprocessor real-time systems

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Inline Emulation for Paravirtualization Environment on embedded systems

Inline Emulation for Paravirtualization Environment on Embed...

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作者： Lee, Yuan-Cheng Hsueh, Chih-Wen Chang, Rong-Guey Natl Taiwan Univ Dept Comp Sci & Informat Engn Taipei 106 Taiwan Natl Chung Cheng Univ Dept Comp Sci & Informat Engn Chiayi 621 Taiwan

ISBN: (纸本)9780769545028

Virtualization has been widely adopted on servers for various purposes such as server consolidation, cloud computing, and so on. Recent years, the trend spreads on embedded systems, although it once seemed to be an impractical idea because of the limited capability of embedded processors. To further lower the overhead of adopting virtualization on embedded systems, we design an optimization technique, called inline emulation, to reduce the cost spending on paravirtualizing operating systems. Inline emulation can also be used in various virtualization environments to increase the performance of emulating privileged instructions. We implement inline emulation for ARMv5 architecture and evaluate in Android Emulator. the result shows it runs much faster, up to 7.4 times, than the common paravirtualization technique for cache-related operations and suggests that it not only lowers the development cost but also increases system responsiveness.

关键词： embedded systems inline emulation paravirtualization virtualization embedded systems Virtualization simulating Servers Methyltestosterone Androids

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Worst-Case Memory Traffic Analysis for Many-Cores using a Limited Migrative Model

Worst-Case Memory Traffic Analysis for Many-Cores using a Li...

引用

ieee 19th international conference on embedded and real-time computing systems and applications (RTCSA)

作者： Nikolic, Borislav Yomsi, Patrick Meumeu Petters, Stefan M. ISEP IPP CISTER INESC TEC Oporto Portugal

ISBN: (纸本)9781479908509

the ratio between the number of cores and memory subsystems (i.e. banks and controllers) in many-core platforms is constantly increasing, leading to non-negligible latencies of memory operations. thus, in order to study the worst-case execution time of an application, it is no longer sufficient to only take into account its computational requirements, but also have to be considered latencies related to its memory operations. In this paper we study a limited migrative model applied upon many-core platforms. this approach is based on a multi-kernel paradigm [3] - a promising step towards scalable and predictable many-cores, which are essential prerequisites for the integration of such systems into the real-time embedded domain. Under that assumption, we present two analytical methods to obtain the worst-case memory traffic delays of individual applications. through experiments we test the applicability of the proposed approaches to different scenarios, and draw practical conclusions concerning routing mechanisms and a distribution of memory operations across memory controllers.

关键词： real time systems

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Preemptive uniprocessor scheduling of non-cyclic GMF task systems

Preemptive uniprocessor scheduling of non-cyclic GMF task sy...

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

作者： Baruah, Sanjoy Univ North Carolina Chapel Hill Chapel Hill NC 27599 USA

ISBN: (纸本)9780769541556

Formal models used for representing recurrent real-time processes are typically characterized by a period parameter, representing the minimum amount of time that may elapse between successive invocations of the process. However a recently proposed model called the non-cyclic GMF model deviates from this trend: there is no single period parameter characterizing the recurrent behavior of the task. In this paper we consider schedulability analysis of real-time systems comprised of collections of such tasks, that are to be scheduled using earliest-deadline first (EDF) scheduling on a single preemptive processor. We provide evidence that indicates that schedulability analysis for such systems is more difficult than for systems in which each recurrent task is characterized by a single period parameter, and derive a pseudo-polynomial time schedulability analysis algorithm for bounded-utilization systems of such tasks.

关键词： Glia Maturation Factor Preemptive Uniprocessor Religious Missions real-time systems real-time process

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