Volume

Dagstuhl Seminar Proceedings, Volume 3471

Publication Details

  • published at: 2004-08-04
  • Publisher: Schloss Dagstuhl – Leibniz-Zentrum für Informatik

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Document
DOI: 10.4230/DagSemProc.03471.1
03471 Abstracts Collection – Design of Systems with Predictable Behaviour

Authors: Lothar Thiele and Reinhard Wilhelm

Abstract
On 16.11.-19.11.2003, the Perspectives Workshop 03471 "Design of Systems with Predictable Behaviour" was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the workshop, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well a digest of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available.
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Lothar Thiele and Reinhard Wilhelm. 03471 Abstracts Collection – Design of Systems with Predictable Behaviour. In Perspectives Workshop: Design of Systems with Predictable Behaviour. Dagstuhl Seminar Proceedings, Volume 3471, pp. 1-8, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2004)

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@InProceedings{thiele_et_al:DagSemProc.03471.1,
  author =	{Thiele, Lothar and Wilhelm, Reinhard},
  title =	{{03471 Abstracts Collection – Design of Systems with Predictable Behaviour}},
  booktitle =	{Perspectives Workshop: Design of Systems with Predictable Behaviour},
  pages =	{1--8},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2004},
  volume =	{3471},
  editor =	{Lothar Thiele and Reinhard Wilhelm},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.03471.1},
  URN =		{urn:nbn:de:0030-drops-73},
  doi =		{10.4230/DagSemProc.03471.1},
  annote =	{Keywords: real-time systems , guarantees , predictability , embedded systems , performance}
}
Document
DOI: 10.4230/DagSemProc.03471.2
Design for Time-Predictability

Authors: Lothar Thiele and Reinhard Wilhelm

Abstract
A large part of safety-critical embedded systems has to satisfy hard real-time constraints. These need sound methods and tools to derive reliable run-time guarantees. The guaranteed run times should not only be reliable, but also precise. The achievable precision highly depends on characteristics of the target architecture and the implementation methods and system layers of the software. Trends in hardware and software design run contrary to predictability. This article describes threats to time-predictability of systems and proposes design principles that support time predictability. The ultimate goal is to design performant systems with sharp upper and lower bounds on execution times.
Cite as

Lothar Thiele and Reinhard Wilhelm. Design for Time-Predictability. In Perspectives Workshop: Design of Systems with Predictable Behaviour. Dagstuhl Seminar Proceedings, Volume 3471, pp. 1-15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2004)

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@InProceedings{thiele_et_al:DagSemProc.03471.2,
  author =	{Thiele, Lothar and Wilhelm, Reinhard},
  title =	{{Design for Time-Predictability}},
  booktitle =	{Perspectives Workshop: Design of Systems with Predictable Behaviour},
  pages =	{1--15},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2004},
  volume =	{3471},
  editor =	{Lothar Thiele and Reinhard Wilhelm},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.03471.2},
  URN =		{urn:nbn:de:0030-drops-23},
  doi =		{10.4230/DagSemProc.03471.2},
  annote =	{Keywords: real-time systems , guarantees , predictability , embedded systems , performance}
}
Document
DOI: 10.4230/DagSemProc.03471.3
Fast, predictable and low energy memory references through architecture-aware compilation

Authors: Peter Marwedel, Lars Wehmeyer, Manish Verma, Stefan Steinke, and Urs Helmig

Abstract
The design of future high-performance embedded systems is hampered by two problems: First, the required hardware needs more energy than is available from batteries. Second, current cache-based approaches for bridging the increasing speed gap between processors and memories cannot guarantee predictable real-time behavior. A contribution to solving both problems is made in this paper which describes a comprehensive set of algorithms that can be applied at design time in order to maximally exploit scratch pad memories (SPMs). We show that both the energy consumption as well as the computed worst case execution time (WCET) can be reduced by up to to 80% and 48%, respectively, by establishing a strong link between the memory architecture and the compiler.
Cite as

Peter Marwedel, Lars Wehmeyer, Manish Verma, Stefan Steinke, and Urs Helmig. Fast, predictable and low energy memory references through architecture-aware compilation. In Perspectives Workshop: Design of Systems with Predictable Behaviour. Dagstuhl Seminar Proceedings, Volume 3471, pp. 1-16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2004)

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@InProceedings{marwedel_et_al:DagSemProc.03471.3,
  author =	{Marwedel, Peter and Wehmeyer, Lars and Verma, Manish and Steinke, Stefan and Helmig, Urs},
  title =	{{Fast, predictable and low energy memory references through architecture-aware compilation}},
  booktitle =	{Perspectives Workshop: Design of Systems with Predictable Behaviour},
  pages =	{1--16},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2004},
  volume =	{3471},
  editor =	{Lothar Thiele and Reinhard Wilhelm},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.03471.3},
  URN =		{urn:nbn:de:0030-drops-66},
  doi =		{10.4230/DagSemProc.03471.3},
  annote =	{Keywords: Embedded system, compiler, energy efficiency, low power, WCET, scratchpad, memory access}
}
Document
DOI: 10.4230/DagSemProc.03471.4
Requirements for and Design of a Processor with Predictable Timing

Authors: Christoph Berg, Jakob Engblom, and Reinhard Wilhelm

Abstract
This paper introduces a set of design principles that aim to make processor architectures amenable to static timing analysis. Based on these principles, we give a design of a hard real-time processor with predictable timing, which is simultaneously capable of reaching respectable performance levels. The design principles we identify are recoverability from information loss in the analysis, minimal variation of the instruction timing, non-interference between processor components, deterministic processor behavior, and comprehensive documentation. The principles are based on our experience and that of other researchers in building timing analysis tools for existing processors.
Cite as

Christoph Berg, Jakob Engblom, and Reinhard Wilhelm. Requirements for and Design of a Processor with Predictable Timing. In Perspectives Workshop: Design of Systems with Predictable Behaviour. Dagstuhl Seminar Proceedings, Volume 3471, pp. 1-20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2004)

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@InProceedings{berg_et_al:DagSemProc.03471.4,
  author =	{Berg, Christoph and Engblom, Jakob and Wilhelm, Reinhard},
  title =	{{Requirements for and Design of a Processor with Predictable Timing}},
  booktitle =	{Perspectives Workshop: Design of Systems with Predictable Behaviour},
  pages =	{1--20},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2004},
  volume =	{3471},
  editor =	{Lothar Thiele and Reinhard Wilhelm},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.03471.4},
  URN =		{urn:nbn:de:0030-drops-57},
  doi =		{10.4230/DagSemProc.03471.4},
  annote =	{Keywords: WCET, hard real-time, embedded systems, computer architecture}
}
Document
DOI: 10.4230/DagSemProc.03471.5
Simplicity Considered Fundamental to Design for Predictability

Authors: Wolfgang Halang

Abstract
Complexity is the core problem of contemporary information technology, as the artificial complicatedness of its artefacts is exploding Intellectually easy and economically feasible predictability can be achieved by selecting simplicity as fundamental design principle. Predictability of system behaviour is identified as the central concept for the design of real-time and embedded systems, since it essentially implies the other requirements timeliness and dependability holding for them. Practically all dynamic and virtual features aiming to enhance the average performance of computing systems as well as the traditional categories and optimality criteria are found inadequate and are, thus, considered harmful. In mainstream research on scheduling the gap between academic research and reality has grown so wide that research results are doomed to irrelevance. Instead, useful scheduling research ought to employ utmost simplicity as optimality criterion, and strive to minimise software size and complexity. Computing should embrace other disciplines’ notions and technologies of time. Programming and verification methods for safety-related applications are identified on the basis of their simplicity and ergonomic aptitude. It is advocated to utilise the permanent advances in microelectronics to solve long untackled problems and to foster simplicity and predictability by hardware support.
Cite as

Wolfgang Halang. Simplicity Considered Fundamental to Design for Predictability. In Perspectives Workshop: Design of Systems with Predictable Behaviour. Dagstuhl Seminar Proceedings, Volume 3471, pp. 1-6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2004)

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@InProceedings{halang:DagSemProc.03471.5,
  author =	{Halang, Wolfgang},
  title =	{{Simplicity Considered Fundamental to Design for Predictability}},
  booktitle =	{Perspectives Workshop: Design of Systems with Predictable Behaviour},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2004},
  volume =	{3471},
  editor =	{Lothar Thiele and Reinhard Wilhelm},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.03471.5},
  URN =		{urn:nbn:de:0030-drops-46},
  doi =		{10.4230/DagSemProc.03471.5},
  annote =	{Keywords: Design for predictability, simplicity, dependability, safety, real-time}
}

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  • Authors
  • B
  • Berg, Christoph
  • E
  • Engblom, Jakob
  • H
  • Halang, Wolfgang
  • Helmig, Urs
  • M
  • Marwedel, Peter
  • S
  • Steinke, Stefan
  • T
  • Thiele, Lothar
  • V
  • Verma, Manish
  • W
  • Wehmeyer, Lars
  • Wilhelm, Reinhard

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