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Documents authored by Neffe, Ulrich

Document
DOI: 10.4230/DagSemProc.07041.4
Automist - A Tool for Automated Instruction Set Characterization of Embedded Processors

Authors: Manuel Wendt, Matthias Grumer, Christian Steger, and Ulrich Neffe

Published in: Dagstuhl Seminar Proceedings, Volume 7041, Power-aware Computing Systems (2007)

Abstract
The steadily increasing performance of mobile devices also implies a rise in power consumption. To counteract this trend it is mandatory to accomplish software power optimizations based on accurate power consumption models characterized for the processor. This paper presents an environment for automated instruction set characterization based on physical power measurements. Based on a detailed instruction set description a testbench generator creates all needed test programs for a complete characterization. Afterwards those programs are executed by the processor and the energy consumption is measured. For an accurate energy measurement a high performance sampling technique has been established, which can be either clock or energy driven.
Cite as

Manuel Wendt, Matthias Grumer, Christian Steger, and Ulrich Neffe. Automist - A Tool for Automated Instruction Set Characterization of Embedded Processors. In Power-aware Computing Systems. Dagstuhl Seminar Proceedings, Volume 7041, pp. 1-10, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2007)

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@InProceedings{wendt_et_al:DagSemProc.07041.4,
  author =	{Wendt, Manuel and Grumer, Matthias and Steger, Christian and Neffe, Ulrich},
  title =	{{Automist - A Tool for Automated Instruction Set Characterization of Embedded Processors}},
  booktitle =	{Power-aware Computing Systems},
  pages =	{1--10},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2007},
  volume =	{7041},
  editor =	{Luca Benini and Naehyuck Chang and Ulrich Kremer and Christian W. Probst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07041.4},
  URN =		{urn:nbn:de:0030-drops-11097},
  doi =		{10.4230/DagSemProc.07041.4},
  annote =	{Keywords: Software energy estimation, automated processor characterization, testbench generator, current measurement, clock driven sampling, energy driven sampl}
}
Document
DOI: 10.4230/DagSemProc.07041.5
Compiler-based Software Power Peak Elimination on Smart Card Systems

Authors: Matthias Grumer, Manuel Wendt, Christian Steger, Reinhold Weiss, Ulrich Neffe, and Andreas Muehlberger

Published in: Dagstuhl Seminar Proceedings, Volume 7041, Power-aware Computing Systems (2007)

Abstract
RF-powered smart cards are widely used in different application areas today. For smart cards not only performance is an important attribute, but also the power consumed by a given application. The power consumed is heavily depending on the software executed on the system. The power profile, especially the power peaks, of an executed application influence the system stability and security. Flattening the power profile can thus increase the stability and security of a system. In this paper we present an optimization system that allows a reduction of power peaks based on a compiler optimization. The optimizations are done on different levels of the compiler. In the backend of the compiler we present new instruction scheduling algorithms. On the intermediate language level we propose the use of iterative compiling for reducing critical peaks.
Cite as

Matthias Grumer, Manuel Wendt, Christian Steger, Reinhold Weiss, Ulrich Neffe, and Andreas Muehlberger. Compiler-based Software Power Peak Elimination on Smart Card Systems. In Power-aware Computing Systems. Dagstuhl Seminar Proceedings, Volume 7041, pp. 1-9, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2007)

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@InProceedings{grumer_et_al:DagSemProc.07041.5,
  author =	{Grumer, Matthias and Wendt, Manuel and Steger, Christian and Weiss, Reinhold and Neffe, Ulrich and Muehlberger, Andreas},
  title =	{{Compiler-based Software Power Peak Elimination on Smart Card Systems}},
  booktitle =	{Power-aware Computing Systems},
  pages =	{1--9},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2007},
  volume =	{7041},
  editor =	{Luca Benini and Naehyuck Chang and Ulrich Kremer and Christian W. Probst},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07041.5},
  URN =		{urn:nbn:de:0030-drops-11030},
  doi =		{10.4230/DagSemProc.07041.5},
  annote =	{Keywords: Software power optimization, compiler optimization, peak reduction}
}
Document
DOI: 10.4230/DagSemProc.05141.7
Methodologies for Designing Power-Aware Smart Card Systems

Authors: Christian Steger, Ulrich Neffe, Klaus Rothbart, Andreas Mühlberger, Edgar Rieger, and Reinhold Weiss

Published in: Dagstuhl Seminar Proceedings, Volume 5141, Power-aware Computing Systems (2005)

Abstract
Smart cards are some of the smallest computing platforms in use today. They have limited resources, but a huge number of functional requirements. The requirement for multi-application cards increases the demand for high performance and security even more, whereas the limits given by size and energy consumption remain constant. We describe new methodologies for designing and implementing entire systems with regard to power awareness and required performance. To make use of this power-saving potential, also the higher layers of the system - the operating system layer and the application domain layer - are required to be designed together with the rest of the system. HW/SW co-design methodologies enable the gain of system-level optimization. The first part presents the abstraction of smart cards to optimize system architecture and memory system. Both functional and transactional-level models are presented and discussed. The proposed design flow and preliminary results of the evaluation are depicted. Another central part of this methodology is a cycle-accurate instruction-set simulator for secure software development. The underlaying energy model is designed to decouple instruction and data dependent energy dissipation, which leads to an independent characterization process and allows stepwise model refinement to increase estimation accuracy. The model has been evaluated for a high-performance smart card CPU and an use-case for secure software is given.
Cite as

Christian Steger, Ulrich Neffe, Klaus Rothbart, Andreas Mühlberger, Edgar Rieger, and Reinhold Weiss. Methodologies for Designing Power-Aware Smart Card Systems. In Power-aware Computing Systems. Dagstuhl Seminar Proceedings, Volume 5141, pp. 1-12, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2005)

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@InProceedings{steger_et_al:DagSemProc.05141.7,
  author =	{Steger, Christian and Neffe, Ulrich and Rothbart, Klaus and M\"{u}hlberger, Andreas and Rieger, Edgar and Weiss, Reinhold},
  title =	{{Methodologies for Designing Power-Aware Smart Card Systems}},
  booktitle =	{Power-aware Computing Systems},
  pages =	{1--12},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{5141},
  editor =	{Luca Benini and Ulrich Kremer and Christian W. Probst and Peter Schelkens},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05141.7},
  URN =		{urn:nbn:de:0030-drops-3067},
  doi =		{10.4230/DagSemProc.05141.7},
  annote =	{Keywords: Smart cards, power awareness, HW/SW codesign, cycle-accurate instruction-set simulator}
}
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