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Artifact
DOI: 10.4230/DARTS.8.1.4
Scheduling Offset-Free Systems Under FIFO Priority Protocol (Artifact)

Authors: Matheus Ladeira, Emmanuel Grolleau, Fabien Bonneval, Gautier Hattenberger, Yassine Ouhammou, and Yuri Hérouard

Published in: DARTS, Volume 8, Issue 1, Special Issue of the 34th Euromicro Conference on Real-Time Systems (ECRTS 2022)

Abstract
On UAVs, telemetry messages are often sent following a FIFO schedule, and some messages, depending on the FIFO queue state may suffer long delays, and can even be lost if the FIFO queue is full. Considering the high complexity of the problem of assigning offsets to periodic tasks, we propose a new heuristic, called GCD+, that we compare to the methods of the state of the art, showing that GCD+ significantly outperforms them on synthetic tasks sets. Then we use a real UAV use case, based on Paparazzi autopilot, to show that GCD+ behaves well. The proposed algorithm is meant to be the new Paparazzi’s automatic offset assignment method for messages.
Cite as

Matheus Ladeira, Emmanuel Grolleau, Fabien Bonneval, Gautier Hattenberger, Yassine Ouhammou, and Yuri Hérouard. Scheduling Offset-Free Systems Under FIFO Priority Protocol (Artifact). In Special Issue of the 34th Euromicro Conference on Real-Time Systems (ECRTS 2022). Dagstuhl Artifacts Series (DARTS), Volume 8, Issue 1, pp. 4:1-4:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@Article{ladeira_et_al:DARTS.8.1.4,
  author =	{Ladeira, Matheus and Grolleau, Emmanuel and Bonneval, Fabien and Hattenberger, Gautier and Ouhammou, Yassine and H\'{e}rouard, Yuri},
  title =	{{Scheduling Offset-Free Systems Under FIFO Priority Protocol (Artifact)}},
  pages =	{4:1--4:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2022},
  volume =	{8},
  number =	{1},
  editor =	{Ladeira, Matheus and Grolleau, Emmanuel and Bonneval, Fabien and Hattenberger, Gautier and Ouhammou, Yassine and H\'{e}rouard, Yuri},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.8.1.4},
  URN =		{urn:nbn:de:0030-drops-165000},
  doi =		{10.4230/DARTS.8.1.4},
  annote =	{Keywords: Scheduling, non-preemptible, heuristics, FIFO, autopilot}
}
Document
DOI: 10.4230/LIPIcs.ECRTS.2022.11
Scheduling Offset-Free Systems Under FIFO Priority Protocol

Authors: Matheus Ladeira, Emmanuel Grolleau, Fabien Bonneval, Gautier Hattenberger, Yassine Ouhammou, and Yuri Hérouard

Published in: LIPIcs, Volume 231, 34th Euromicro Conference on Real-Time Systems (ECRTS 2022)

Abstract
On UAVs, telemetry messages are often sent following a FIFO schedule, and some messages, depending on the FIFO queue state may suffer long delays, and can even be lost if the FIFO queue is full. Considering the high complexity of the problem of assigning offsets to periodic tasks, we propose a new heuristic, called GCD+, that we compare to the methods of the state of the art, showing that GCD+ significantly outperforms them on synthetic tasks sets. Then we use a real UAV use case, based on Paparazzi autopilot, to show that GCD+ behaves well. The proposed algorithm is meant to be the new Paparazzi’s automatic offset assignment method for messages.
Cite as

Matheus Ladeira, Emmanuel Grolleau, Fabien Bonneval, Gautier Hattenberger, Yassine Ouhammou, and Yuri Hérouard. Scheduling Offset-Free Systems Under FIFO Priority Protocol. In 34th Euromicro Conference on Real-Time Systems (ECRTS 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 231, pp. 11:1-11:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{ladeira_et_al:LIPIcs.ECRTS.2022.11,
  author =	{Ladeira, Matheus and Grolleau, Emmanuel and Bonneval, Fabien and Hattenberger, Gautier and Ouhammou, Yassine and H\'{e}rouard, Yuri},
  title =	{{Scheduling Offset-Free Systems Under FIFO Priority Protocol}},
  booktitle =	{34th Euromicro Conference on Real-Time Systems (ECRTS 2022)},
  pages =	{11:1--11:19},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-239-6},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{231},
  editor =	{Maggio, Martina},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2022.11},
  URN =		{urn:nbn:de:0030-drops-163281},
  doi =		{10.4230/LIPIcs.ECRTS.2022.11},
  annote =	{Keywords: Scheduling, non-preemptible, heuristics, FIFO, autopilot}
}
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