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检索条件"任意字段=13th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications"

共 2023 条记录，以下是1001-1010 订阅

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Using virtual CPU migration to solve the lock holder preemption problem in a multicore processor-based virtualization layer for embedded systems

Using virtual CPU migration to solve the lock holder preempt...

引用

18th ieee international conference on embedded and real-time computing systems and applications, RTCSA 2012

作者： Mitake, Hitoshi Lin, Tsung-Han Kinebuchi, Yuki Shimada, Hiromasa Nakajima, Tatsuo NTT Software Innovation Center Japan Department of Computer Science and Engineering Waseda University Japan

ISBN: (纸本)9781467330176

When a real-time OS (RTOS) and a symmetric multiprocessing general purpose OS (SMP GPOS) are executed on the same multicore processor, there is a possibility to cause the lock holder preemption (LHP) problem, which is a well known problem of the sources of the performance degradation on an SMP GPOS. the problem occurs when a kernel mode thread holding a lock in a SMP GPOS is preempted by other OSes if these OSes share the same physical core. the existing solution does not take into account real-time responsiveness so it is not suitable to use in embedded systems. the paper proposes two new techniques to avoid the LHP problem for ensuring both the real-time responsiveness of real-time OS and the high throughput of SMP GPOS. the new proposed techniques have been implemented on our virtualization layer called SPUMONE, and we measured the results showing that the proposed new techniques reduce the LHP problem without degrading the real-time responsiveness. © 2012 ieee.

关键词： Locks (fasteners)

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Proceedings - 16th ieee international conference on embedded and real-time computing systems and applications, RTCSA 2010

Proceedings - 16th IEEE International Conference on Embedded...

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16th ieee international conference on embedded and real-time computing systems and applications, RTCSA 2010

ISBN: (纸本)9780769541556

the proceedings contain 41 papers. the topics discussed include: a study of utilization bound and run-time overhead for cluster scheduling in multiprocessor real-time systems;improving the schedulability of sporadic self-suspending soft real-time multiprocessor task systems;real-time communication for multicore systems with multi-domain ring buses;towards pervasive mashups in embedded devices;real-time activity recognition in wireless body sensor networks: from simple gestures to complex activities;detecting, locating, and tracking hacker activities within a WLAN network;sensitivity analysis for EDF scheduled arbitrary deadline real-time systems;feasibility analysis under fixed priority scheduling with fixed preemption points;modeling of real-time system designs for parametric analysis;and context-based analysis of system execution traces for validating distributed real-time and embedded system quality-of-service properties.

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Dynamic Tuning of the Workload Partition Factor in Data-Intensive applications

Dynamic Tuning of the Workload Partition Factor in Data-Inte...

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14th ieee international conference on High Performance computing and Communications (HPCC) / ieee 9th international conference on embedded Software and systems (ICESS)

作者： Rosas, Claudia Sikora, Anna Jorba, Josep Moreno, Andreu Cesar, Eduardo Univ Autonoma Barcelona Bellaterra 08193 Spain Univ Oberta De Catalunya Barcelona 08018 Spain Escola Univ Salesiana De Sarria Barcelona 08017 Spain

ISBN: (纸本)9780769547497

the recent data deluge needing to be processed represents one of the major challenges in computational field. Available high-performance computing (HPC) systems can be very useful for solving this problem when data can be divided in chunks that can be processed in parallel. However, due to intrinsic characteristics of data-intensive problems, these applications can present huge load imbalances, and it can be difficult to efficiently use the available resources. this work proposes a strategy for dynamically analyzing and tuning the partition factor used to generate the data chunks. With the aim of decreasing the load imbalance and therefore the overall execution time, this strategy divides the data chunks with the biggest computation times and gathers contiguous chunks with the smallest computation times. the criteria to divide or join chunks are based on the chunks' associated execution time (average and standard deviation) and the number of processing nodes being used. We have evaluated our strategy by using simulation, and a real data-intensive application. Applying our strategy, we have obtained promising results since we have improved up to 55% the total execution time.

关键词： dynamic tuning data-intensive applications

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Co-analysis of SysML and simulink models for cyber-physical systems design

Co-analysis of SysML and simulink models for cyber-physical ...

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18th ieee international conference on embedded and real-time computing systems and applications, RTCSA 2012

作者： Nakajima, Shin Furukawa, Satoru Ueda, Yoshikazu National Institute of Informatics Tokyo Japan Graduate School of Science and Engineering Ibaraki University Hitachi City Japan

ISBN: (纸本)9781467330176

Model-Based Development (MBD) is a promising approach to achieving the required reliability levels of Cyber-Physical systems. these systems are inherently heterogeneous. For example, models such as a controller and a plant have different characteristics. this paper proposes a Co-Analysis method. Logic-based analysis is employed to deal with an under-constrained or non-deterministic controller described with SysML. the analysis of the plant with Simulink adapts numerical simulation methods since the model represents physical phenomena whose time-dependent behavior is deterministic but computed with the initial states. the paper discusses further issues with the proposed co-analysis method. © 2012 ieee.

关键词： Simulink

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SAFCM: A security-aware feedback control mechanism for distributed real-time embedded systems

SAFCM: A security-aware feedback control mechanism for distr...

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18th ieee international conference on embedded and real-time computing systems and applications, RTCSA 2012

作者： Ma, Yue Jiang, Wei Sang, Nan Pop, Paul School of Computer Science and Engineering University of Electronic Science and Technology of China China Informatics and Mathematical Modeling Department Technical University of Denmark DK-2800 Kongens Lyngby Denmark

ISBN: (纸本)9781467330176

Distributed real-time embedded (DRE) systems are facing great challenges in networked, unpredictable and especially unsecured environments. In such systems, there is a strong need to enforce security on distributed computing nodes in order to guard against potential threats, while satisfying the real-time requirements. this paper proposes a Security-Aware Feedback Control Mechanism (SAFCM) which has the ability to dynamically change the security level to guarantee soft real-time requirements and make the security protection as strong as possible. In order to widely support distributed real-time systems, a multi-input multi-output feedback loop is designed and a model predictive controller is deployed based on an equation model that describes the dynamic behavior of the DRE systems. this control loop uses security level scaling to globally control the CPU utilization and security performance for the whole system. We propose a "security level" metric based on an evolution of cryptography algorithms used in embedded systems. Experimental results demonstrate that SAFCM not only has the excellent adaptivity compared to open-loop mechanism, but also has a better overall performance than PID control mechanism. © 2012 ieee.

关键词： Feedback control

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Context-aware speculative prefetch for soft real-time applications

Context-aware speculative prefetch for soft real-time applic...

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18th ieee international conference on embedded and real-time computing systems and applications, RTCSA 2012

作者： Lifa, Adrian Eles, Petru Peng, Zebo Linköping University Linköping Sweden

ISBN: (纸本)9781467330176

Dynamically reconfigurable computing devices have the ability to adapt their hardware to application demands, providing the performance of hardware acceleration, as well as high flexibility, at competitive costs. For these reasons, FPGA-based reconfigurable systems are becoming popular in many application domains, including soft real-time computing. Unfortunately, one of their biggest limitations is the high reconfiguration overhead. One method to overcome this problem is configuration prefetching, which tries to reduce the reconfiguration penalty by preloading modules on the FPGA before they are needed, and overlapping the reconfiguration with useful computation. In this paper we present a speculative approach to context-aware inter-procedural configuration prefetching that provides statistical guarantees by minimizing the alpha-percentile of the execution time distribution of a soft real-time application. Our method uses profile information and takes into account the calling context of a procedure in order to generate better prefetch solutions. We also propose a middleware needed to apply the context-dependent prefetches at run-time. Our experiments show that the developed algorithm outperforms the previous state-of-art. © 2012 ieee.

关键词： Field programmable gate arrays (FPGA)

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A Test Facility for Experimental HIL Analysis of Industrial embedded Control systems

A Test Facility for Experimental HIL Analysis of Industrial ...

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17th ieee international conference on Emerging Technologies and Factory Automation (ETFA)

作者： Abugchem, Fathi Short, Michael Xu, Donglai Univ Teesside Elect & Control Grp Middlesbrough Cleveland England

ISBN: (纸本)9781467347372;9781467347358

It is well known that the performance of real-time control applications can be affected by many factors, including the choice (and configuration) of the hardware platform and task scheduling algorithm. this paper presents a real-time hardware-in-the-loop simulation tool that simultaneously integrates concepts from control and real-time computing to allow further investigation into these links. It allows the experimental prototyping and analysis of real-time control systems on real hardware - but within a simulated plant environment and thus allows the potential impacts of hardware and software architecture on control performance and dependability to be evaluated. the structure of the proposed tool is described, along with a preliminary experiment that has been performed to illustrate some of the test facility capabilities.

关键词： control engineering computing control system analysis embedded systems industrial control industrial plants scheduling software architecture test facilities

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Optimizing data allocation for loops on embedded systems with scratch-pad memory

Optimizing data allocation for loops on embedded systems wit...

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18th ieee international conference on embedded and real-time computing systems and applications, RTCSA 2012

作者： Zhang, Jun Deng, Tan Gao, Qiuyan Zhuge, Qingfeng Sha, Edwin H.-M. College of Information Science and Engineering Hunan University Changsha China College of Computer Science Chongqing University Chongqing China Department of Computer Science University of Texas at Dallas Richardson TX 75080 United States

ISBN: (纸本)9781467330176

Scratch Pad Memory (SPM), a software-controlled on-chip memory, is popular in embedded systems due to its many benefits. To efficiently manage SPM, many different data allocation algorithms are proposed. However, most of them cannot achieve optimal results. In this paper, we proposed a dynamic programming approach, Iterational Optimal Data Allocation (IODA) to allocate data for embedded systems with multiple types of memory units. According to the experimental results, the IODA algorithm lowered the energy consumption by 20.14% and 5.11% compared to a random memory allocation and a greedy algorithm, respectively. It also reduced the memory access time by 18.44% and 5.83% compared to a random memory allocation and a greedy algorithm, respectively. © 2012 ieee.

关键词： embedded systems

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Dynamic Global Scheduling of Parallel real-time Tasks

Dynamic Global Scheduling of Parallel Real-Time Tasks

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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： Nogueira, Luis Fonseca, Jose Carlos Maia, Claudio Pinho, Luis Miguel Polytech Inst Porto IPP CISTER Res Ctr INESC TEC Sch Engn ISEP Oporto Portugal

ISBN: (纸本)9781467351652;9780769549149

High-level parallel languages offer a simple way for application programmers to specify parallelism in a form that easily scales with problem size, leaving the scheduling of the tasks onto processors to be performed at runtime. therefore, if the underlying system cannot efficiently execute those applications on the available cores, the benefits will be lost. In this paper, we consider how to schedule highly heterogenous parallel applications that require real-time performance guarantees on multicore processors. the paper proposes a novel scheduling approach that combines the global Earliest Deadline First (EDF) scheduler with a priority-aware work-stealing load balancing scheme, which enables parallel real-time tasks to be executed on more than one processor at a given time instant. Experimental results demonstrate the better scalability and lower scheduling overhead of the proposed approach comparatively to an existing real-time deadline-oriented scheduling class for the Linux kernel.

关键词： Linux kernel Parallel real-time systems global scheduling task-level parallelism Religious Missions PROCESSOR Parallel Lines Multi-core processors parallelism

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A parallel algorithm for EDF-schedulability analysis of multi-modal real-time systems

A parallel algorithm for EDF-schedulability analysis of mult...

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18th ieee international conference on embedded and real-time computing systems and applications, RTCSA 2012

作者： Ahmed, Masud Fisher, Nathan Grosu, Daniel Department of Computer Science Wayne State University United States

ISBN: (纸本)9781467330176

Modern real-time embedded systems often require the capability of switching between operating modes to adapt in dynamically changing environments. the development of such real-time multi-modal systems fundamentally relies upon effective schedulability analysis. Recently, researchers have proposed serial schedulability analysis algorithms for multi-modal systems that account for mode changes at both software level (e.g., changing the set of executing tasks) and hardware level (e.g., changing the operating speed of a processor). However, these algorithms have high runtime complexity which limits their practical usage as schedulability analysis in system design-space exploration. In this paper, we design a parallel algorithm as an efficient solution to the problem of determining the schedulability of uniprocessor multi-modal real-time systems scheduled by EDF. By emphasizing a balanced workload distribution and restricting the number of synchronizations, our parallel algorithm achieves a near-perfect speedup observable both theoretically and experimentally. Experimental results show that the runtime of our parallel algorithm is very low even for systems with large number of modes, making it a tractable choice for design-space exploration of real-time multi-modal systems. © 2012 ieee.

关键词： real time systems

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