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Documents authored by Bate, Iain

Document
DOI: 10.4230/LIPIcs.ECRTS.2021.7
Schedulability Analysis for Multi-Core Systems Accounting for Resource Stress and Sensitivity

Authors: Robert I. Davis, David Griffin, and Iain Bate

Published in: LIPIcs, Volume 196, 33rd Euromicro Conference on Real-Time Systems (ECRTS 2021)

Abstract
Timing verification of multi-core systems is complicated by contention for shared hardware resources between co-running tasks on different cores. This paper introduces the Multi-core Resource Stress and Sensitivity (MRSS) task model that characterizes how much stress each task places on resources and how much it is sensitive to such resource stress. This model facilitates a separation of concerns, thus retaining the advantages of the traditional two-step approach to timing verification (i.e. timing analysis followed by schedulability analysis). Response time analysis is derived for the MRSS task model, providing efficient context-dependent and context independent schedulability tests for both fixed priority preemptive and fixed priority non-preemptive scheduling. Dominance relations are derived between the tests, and proofs of optimal priority assignment provided. The MRSS task model is underpinned by a proof-of-concept industrial case study.
Cite as

Robert I. Davis, David Griffin, and Iain Bate. Schedulability Analysis for Multi-Core Systems Accounting for Resource Stress and Sensitivity. In 33rd Euromicro Conference on Real-Time Systems (ECRTS 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 196, pp. 7:1-7:26, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{davis_et_al:LIPIcs.ECRTS.2021.7,
  author =	{Davis, Robert I. and Griffin, David and Bate, Iain},
  title =	{{Schedulability Analysis for Multi-Core Systems Accounting for Resource Stress and Sensitivity}},
  booktitle =	{33rd Euromicro Conference on Real-Time Systems (ECRTS 2021)},
  pages =	{7:1--7:26},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-192-4},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{196},
  editor =	{Brandenburg, Bj\"{o}rn B.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2021.7},
  URN =		{urn:nbn:de:0030-drops-139388},
  doi =		{10.4230/LIPIcs.ECRTS.2021.7},
  annote =	{Keywords: real-time, multi-core, scheduling, schedulability analysis, cross-core contention, resource stress, resource sensitivity}
}
Document
DOI: 10.4230/LIPIcs.ECRTS.2019.8
Industrial Application of a Partitioning Scheduler to Support Mixed Criticality Systems

Authors: Stephen Law, Iain Bate, and Benjamin Lesage

Published in: LIPIcs, Volume 133, 31st Euromicro Conference on Real-Time Systems (ECRTS 2019)

Abstract
The ever-growing complexity of safety-critical control systems continues to require evolution in control system design, architecture and implementation. At the same time the cost of developing such systems must be controlled and importantly quality must be maintained. This paper examines the application of Mixed Criticality System (MCS) research to a DAL-A aircraft engine Full Authority Digital Engine Control (FADEC) system which includes studying porting the control system’s software to a preemptive scheduler from a non-preemptive scheduler. The paper deals with three key challenges as part of the technology transitions. Firstly, how to provide an equivalent level of fault isolation to ARINC 653 without the restriction of strict temporal slicing between criticality levels. Secondly extending the current analysis for Adaptive Mixed Criticality (AMC) scheduling to include the overheads of the system. Finally the development of clustering algorithms that automatically group tasks into larger super-tasks to both reduce overheads whilst ensuring the timing requirements, including the important task transaction requirements, are met.
Cite as

Stephen Law, Iain Bate, and Benjamin Lesage. Industrial Application of a Partitioning Scheduler to Support Mixed Criticality Systems. In 31st Euromicro Conference on Real-Time Systems (ECRTS 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 133, pp. 8:1-8:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{law_et_al:LIPIcs.ECRTS.2019.8,
  author =	{Law, Stephen and Bate, Iain and Lesage, Benjamin},
  title =	{{Industrial Application of a Partitioning Scheduler to Support Mixed Criticality Systems}},
  booktitle =	{31st Euromicro Conference on Real-Time Systems (ECRTS 2019)},
  pages =	{8:1--8:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-110-8},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{133},
  editor =	{Quinton, Sophie},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2019.8},
  URN =		{urn:nbn:de:0030-drops-107455},
  doi =		{10.4230/LIPIcs.ECRTS.2019.8},
  annote =	{Keywords: MCS, DO-178C, Real-Time}
}
Document
DOI: 10.4230/LIPIcs.ECRTS.2018.7
Transferring Real-Time Systems Research into Industrial Practice: Four Impact Case Studies

Authors: Robert I. Davis, Iain Bate, Guillem Bernat, Ian Broster, Alan Burns, Antoine Colin, Stuart Hutchesson, and Nigel Tracey

Published in: LIPIcs, Volume 106, 30th Euromicro Conference on Real-Time Systems (ECRTS 2018)

Abstract
This paper describes four impact case studies where real-time systems research has been successfully transferred into industrial practice. In three cases, the technology created was translated into a viable commercial product via a start-up company. This technology transfer led to the creation and sustaining of a large number of high technology jobs over a 20 year period. The final case study involved the direct transfer of research results into an engineering company. Taken together, all four case studies have led to significant advances in automotive electronics and avionics, providing substantial returns on investment for the companies using the technology.
Cite as

Robert I. Davis, Iain Bate, Guillem Bernat, Ian Broster, Alan Burns, Antoine Colin, Stuart Hutchesson, and Nigel Tracey. Transferring Real-Time Systems Research into Industrial Practice: Four Impact Case Studies. In 30th Euromicro Conference on Real-Time Systems (ECRTS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 106, pp. 7:1-7:24, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{davis_et_al:LIPIcs.ECRTS.2018.7,
  author =	{Davis, Robert I. and Bate, Iain and Bernat, Guillem and Broster, Ian and Burns, Alan and Colin, Antoine and Hutchesson, Stuart and Tracey, Nigel},
  title =	{{Transferring Real-Time Systems Research into Industrial Practice: Four Impact Case Studies}},
  booktitle =	{30th Euromicro Conference on Real-Time Systems (ECRTS 2018)},
  pages =	{7:1--7:24},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-075-0},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{106},
  editor =	{Altmeyer, Sebastian},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2018.7},
  URN =		{urn:nbn:de:0030-drops-89955},
  doi =		{10.4230/LIPIcs.ECRTS.2018.7},
  annote =	{Keywords: real-time systems, industrial impact, automotive, avionics}
}
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