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Constant-time Admission Control for Partitioned EDF

Constant-Time Admission Control for Partitioned EDF

引用

22nd Euromicro Conference on real-time systems (ECRTS)

作者： Masrur, Alejandro Chakraborty, Samarjit Faerber, Georg Institute for Real-Time Computer Systems TU Munich Germany

ISBN: (纸本)9780769541112

An admission control test is responsible for deciding whether a new task may be accepted by a set of running tasks, such that the already admitted and the new task are all schedulable. Admission control decisions have to be taken on-line and, hence, there is a strong interest in developing efficient algorithms for different setups. In this paper, we propose a novel constant-time admission control test for tasks scheduled on identical processors under partitioned Earliest Deadline First (EDF), i.e., once tasks have been assigned to a processor they remain on that processor. In particular, to model demanding real-time systems, we consider the case where relative deadlines may be less than the minimum separation between two consecutive task activations or jobs. The main advantage of the proposed test is that the time it takes is independent of the number of tasks currently admitted in the system. While it is possible to adapt polynomial-time schedulability tests from the literature to design a linear or even constant-time admission control for this setup, the test we propose provides a better accuracy/complexity ratio. We evaluate this test through a set of detailed experiments based on synthetic tasks and a realistic case study consisting of a real-time multimedia server.

关键词： real time systems

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Multiprocessor system and software design for distributed control applications

Multiprocessor system and software design for distributed co...

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12th International Symposium on System-on-Chip 2010, SoC 2010

作者： Chakraborty, Samarjit Institute for Real-Time Computer Systems TU Munich Germany

ISBN: (纸本)9781424482764

Control applications are now increasingly mapped onto multiprocessor architectures, a familiar example being automotive platforms which now consist of more than 80 electronic control units (ECUs). Such control systems typically consist of several control loops, with different parts of each control application being mapped onto different processors that communicate over one or more communication buses. In such setups, the system architecture and scheduling policies have a significant impact on control performance. In this talk we will discuss both, platform architecture, as well as software design techniques for such setups, in order to satisfy real-time and control performance constraints. ©2010 IEEE.

关键词： Software design

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Driver body-height prediction for an ergonomically optimized ingress using a single omnidirectional camera

Driver body-height prediction for an ergonomically optimized...

引用

International Conference on Pattern Recognition

作者： Scharfenberger, Christian Chakraborty, Samarjit Färber, Georg Institute for Real-Time Computer Systems TU Munich Germany

ISBN: (纸本)9780769541099

Maximizing passengers comfort is an important research topic in the domain of automotive systems engineering. In particular, an automatic adjustment of seat position according to driver height significantly increases the level of comfort during ingress. In this paper, we present a new method to estimate the height of approaching car drivers based on a single omnidirectional camera integrated with the side-view mirror of a car. Towards this, we propose mathematical descriptions of standard parking scenarios, allowing for an accurate height estimation. First, approaching drivers are extracted from image frames captured by the camera. Second, the scenario and height are initially estimated based on gathered samples of angles to head and foot-points of an approaching driver. An iterative optimization process removes outliers and refines the initially estimated scenario and height. Finally, we present a number of experimental results based on image sequences captured from real-life ingress scenarios. © 2010 IEEE.

关键词： Iterative methods

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Towards more realistic simulations of ad-hoc networks-challenges and opportunities

Towards more realistic simulations of ad-hoc networks-challe...

引用

2010 International Symposium on Performance Evaluation of computer and Telecommunication systems, SPECTS 2010

作者： Moser, Steffen Slomka, Frank Institute of Embedded Systems/Real-Time Systems Faculty of Engineering and Computer Science Ulm University 89069 Ulm Germany

ISBN: (纸本)9781617387036

Vehicular Ad-hoc Networks are a very interesting self-organizing communication system that can make the traffic on our roads much safer. A lot of aspects of the behavior of these systems are studied using network simulation frameworks. While the upper communication layers of Vehicular Ad-hoc Networks are mainly simulated according to their specifications, in this paper we will highlight weak points in these simulations. They occur due the fact that the layers below the link layer are considered very rarely and are also almost neglected by the commonly used network simulation frameworks. This can potentially lead to inaccurate simulation results which can be fatal when studying safety relevant applications or application with real-time constraints. In this work in progress paper we are going to propose an approach to get this under control.

关键词： Vehicular ad hoc networks

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Modeling buffers with data refresh semantics in automotive architectures

Modeling buffers with data refresh semantics in automotive a...

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6th Embedded systems Week 2010, ESWEEK 2010 - 10th ACM International Conference on Compilers, Architecture and Synthesis for Embedded systems, EMSOFT'10

作者： Phan, Linh T.X. Schneider, Reinhard Chakraborty, Samarjit Lee, Insup Department of Computer and Information Science University of Pennsylvania United States Institute for Real-Time Computer Systems TU Munich Germany

ISBN: (纸本)9781605589046

Automotive architectures consist of multiple electronic control units (ECUs) which run distributed control applications. Such ECUs are connected to sensors and actuators and communicate via shared buses. Resource arbitration at the ECUs and also in the communication medium, coupled with variabilities in execution requirements of tasks results in jitter in the signal/data streams existing in the system. As a result, buffers are required at the ECUs and bus controllers. However, these buffers often implement different semantics - FIFO queuing, which is the most straightforward buffering scheme, and data refreshing, where stale data is overwritten by freshly sampled data. Traditional timing and schedulability analysis that are used to compute, e.g., end-to-end delays, in such automotive architectures can only model FIFO buffering. As a result, they return pessimistic delay and resource estimates because in reality overwritten data items do not get processed by the system. In this paper we propose an analytical framework for accurately modeling such data refresh semantics. Our model exploits a novel feedback control mechanism and is purely functional in nature. As a result, it is scalable and does not involve any explicit state modeling. Using this model we can estimate various timing and performance metrics for automotive ECU networks consisting of buffers implementing different data handling semantics. We illustrate the utility of this model through three case studies from the automotive electronics domain.

关键词： Semantics

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Towards more realistic simulations of Ad-hoc networks - Challenges and opportunities

Towards more realistic simulations of Ad-hoc networks - Chal...

引用

作者： Moser, Steffen Slomka, Frank Institute of Embedded Systems/Real-Time Systems Faculty of Engineering and Computer Science Ulm University 89069 Ulm Germany

ISBN: (纸本)9781565553415

关键词： Vehicular ad hoc networks

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Comparing Bluetooth HDP and SPP for mobile health devices

Comparing Bluetooth HDP and SPP for mobile health devices

引用

2010 International Conference on Body Sensor Networks, BSN 2010

作者： Noueihed, Jad Diemer, Robert Chakraborty, Samarjit Biala, Stefanie Institute for Real-Time Computer Systems TU Munich Munich Germany Vodafone Group R and D Germany Munich Germany

ISBN: (纸本)9780769540658

The Bluetooth SIG recently released the Health Device Profile (HDP) in an effort to standardize health device communication using Bluetooth technology. HDP uses the IEEE 11073-20601 Data Exchange Protocol as the transport content. The same traffic can be sent using the popular Serial Port Profile (SPP), but this profile is not configured for health device communication. HDP's strict configurations and health device-specific requirements give the impression that it would have a reduced performance in comparison to SPP. In this paper we compare HDP with SPP by analyzing multi-rate data transmission in the context of a cardiovascular monitoring application. In particular, we model the expected number of transmissions and packet loss incurred by the two profiles. Our results show that in contrast to popular belief the transmission energy is similar for both profiles, but HDP offers the advantage of plug-and-play interoperability. © 2010 IEEE.

关键词： Electronic data interchange

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Evaluating the impact of communication latency on applications running over on-chip multiprocessing platforms: A layered approach

Evaluating the impact of communication latency on applicatio...

引用

8th IEEE International Conference on Industrial Informatics, INDIN 2010

作者： Indrusiak, Leandro Soares Ost, Luciano Copello Moraes, Fernando Gehm Määttä, Sanna Nurmi, Jari Möller, Leandro Glesner, Manfred Real-Time Systems Group Computer Science Department University of York United Kingdom Porto Alegre Brazil Department of Computer Systems Tampere University of Technology Finland Institute of Microelectronic Systems Darmstadt University of Technology Germany

ISBN: (纸本)9781424473007

The evaluation of communication latency in multiprocessor platforms requires the profiling of the application, the description of the architecture of the platform and of the mapping of application tasks onto processing cores. In this paper, we describe a layered approach that allows application developers to obtain accurate figures for communication latency from an abstract model of the application functionality. A complete separation of concerns is a critical part of this approach, so the major contribution here is the definition of interfaces between different layers: an abstract application model, its executable counterpart, the mapping heuristic and the multiprocessor platform model. Case studies with a realistic application and a NoC-based multiprocessor platform show the potential of the proposed approach using two different system evaluation techniques: simulation and static analysis. © 2010 IEEE.

关键词： Mapping

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Multiprocessor system and software design for distributed control applications

Multiprocessor system and software design for distributed co...

引用

IEEE International Symposium on System-on-Chip

作者： Samarjit Chakraborty Computer Systems Institute of Real-Time Munich Germany

关键词： computer architecture Delay Program processors Embedded systems Analytical models

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Model-based analysis, synthesis and testing of automotive hardware/software architectures

Model-based analysis, synthesis and testing of automotive ha...

引用

6th Embedded systems Week 2010, ESWEEK 2010 - 10th ACM International Conference on Compilers, Architecture and Synthesis for Embedded systems, EMSOFT'10

作者： Chakraborty, Samarjit Ramesh, S. Teich, Jürgen Institute for Real-Time Computer Systems TU Munich Germany India Science Laboratory General Motors R and D India Department of Computer Science University of Erlangen-Nuremberg Germany

ISBN: (纸本)9781605589046

This tutorial is concerned with various aspects of model-based design of hardware/software architectures of automotive systems. It will be split into three parts, the first dealing with model-based analysis of automotive ECU networks, the second with synthesis of schedules for such networks, and finally the third with model-based testing of such architectures.

关键词： Model checking

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