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Documents authored by Pazzaglia, Paolo

Document
DOI: 10.4230/LIPIcs.ECRTS.2024.6
Optimizing Per-Core Priorities to Minimize End-To-End Latencies

Authors: Francesco Paladino, Alessandro Biondi, Enrico Bini, and Paolo Pazzaglia

Published in: LIPIcs, Volume 298, 36th Euromicro Conference on Real-Time Systems (ECRTS 2024)

Abstract
Logical Execution Time (LET) allows decoupling the schedule of real-time periodic tasks from their communication, with the advantage of isolating the communication pattern from the variability of the schedule. However, when such tasks are organized in chains, the usage of LET at the task level does not necessarily transfer the same LET properties to the chain level. In this paper, we extend a LET-like model from tasks to chains spanning over multiple cores. We leverage the designed constant latency chains to optimize per-core priority assignment. Finally, we also provide a set of heuristic algorithms, that are compared in a large-scale experimental evaluation.
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Francesco Paladino, Alessandro Biondi, Enrico Bini, and Paolo Pazzaglia. Optimizing Per-Core Priorities to Minimize End-To-End Latencies. In 36th Euromicro Conference on Real-Time Systems (ECRTS 2024). Leibniz International Proceedings in Informatics (LIPIcs), Volume 298, pp. 6:1-6:25, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@InProceedings{paladino_et_al:LIPIcs.ECRTS.2024.6,
  author =	{Paladino, Francesco and Biondi, Alessandro and Bini, Enrico and Pazzaglia, Paolo},
  title =	{{Optimizing Per-Core Priorities to Minimize End-To-End Latencies}},
  booktitle =	{36th Euromicro Conference on Real-Time Systems (ECRTS 2024)},
  pages =	{6:1--6:25},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-324-9},
  ISSN =	{1868-8969},
  year =	{2024},
  volume =	{298},
  editor =	{Pellizzoni, Rodolfo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2024.6},
  URN =		{urn:nbn:de:0030-drops-203094},
  doi =		{10.4230/LIPIcs.ECRTS.2024.6},
  annote =	{Keywords: Cause-Effect Chains, Logical Execution Time, End-to-End Latency, Design Optimization, Task Priorities, Data Age, Reaction Time}
}
Document
Artifact
DOI: 10.4230/DARTS.5.1.3
DMAC: Deadline-Miss-Aware Control (Artifact)

Authors: Paolo Pazzaglia, Claudio Mandrioli, Martina Maggio, and Anton Cervin

Published in: DARTS, Volume 5, Issue 1, Special Issue of the 31st Euromicro Conference on Real-Time Systems (ECRTS 2019)

Abstract
The real-time implementation of periodic controllers requires solving a co-design problem, in which the choice of the controller sampling period is a crucial element. Classic design techniques limit the period exploration to safe values, that guarantee the correct execution of the controller alongside the remaining real-time load, i.e., ensuring that the controller worst-case response time does not exceed its deadline. This paper presents the artifact linked to DMAC: the first formally-grounded controller design strategy that explores shorter periods, thus explicitly taking into account the possibility of missing deadlines. The experimental results obtained with this artifact show that the DMAC design proposal - i.e., exploring the space where deadlines can be missed and handled with different strategies - greatly outperforms classical control design techniques.
Cite as

Paolo Pazzaglia, Claudio Mandrioli, Martina Maggio, and Anton Cervin. DMAC: Deadline-Miss-Aware Control (Artifact). In Special Issue of the 31st Euromicro Conference on Real-Time Systems (ECRTS 2019). Dagstuhl Artifacts Series (DARTS), Volume 5, Issue 1, pp. 3:1-3:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@Article{pazzaglia_et_al:DARTS.5.1.3,
  author =	{Pazzaglia, Paolo and Mandrioli, Claudio and Maggio, Martina and Cervin, Anton},
  title =	{{DMAC: Deadline-Miss-Aware Control}},
  pages =	{3:1--3:3},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2019},
  volume =	{5},
  number =	{1},
  editor =	{Pazzaglia, Paolo and Mandrioli, Claudio and Maggio, Martina and Cervin, Anton},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.5.1.3},
  URN =		{urn:nbn:de:0030-drops-107315},
  doi =		{10.4230/DARTS.5.1.3},
  annote =	{Keywords: Weakly-Hard Real-Time Systems, Deadline Miss Handling, Control Design}
}
Document
DOI: 10.4230/LIPIcs.ECRTS.2019.1
DMAC: Deadline-Miss-Aware Control

Authors: Paolo Pazzaglia, Claudio Mandrioli, Martina Maggio, and Anton Cervin

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

Abstract
The real-time implementation of periodic controllers requires solving a co-design problem, in which the choice of the controller sampling period is a crucial element. Classic design techniques limit the period exploration to safe values, that guarantee the correct execution of the controller alongside the remaining real-time load, i.e., ensuring that the controller worst-case response time does not exceed its deadline. This paper presents DMAC: the first formally-grounded controller design strategy that explores shorter periods, thus explicitly taking into account the possibility of missing deadlines. The design leverages information about the probability that specific sub-sequences of deadline misses are experienced. The result is a fixed controller that on average works as the ideal clairvoyant time-varying controller that knows future deadline hits and misses. We obtain a safe estimate of the hit and miss events using the scenario theory, that allows us to provide probabilistic guarantees. The paper analyzes controllers implemented using the Logical Execution Time paradigm and three different strategies to handle deadline miss events: killing the job, letting the job continue but skipping the next activation, and letting the job continue using a limited queue of jobs. Experimental results show that our design proposal - i.e., exploring the space where deadlines can be missed and handled with different strategies - greatly outperforms classical control design techniques.
Cite as

Paolo Pazzaglia, Claudio Mandrioli, Martina Maggio, and Anton Cervin. DMAC: Deadline-Miss-Aware Control. In 31st Euromicro Conference on Real-Time Systems (ECRTS 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 133, pp. 1:1-1:24, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{pazzaglia_et_al:LIPIcs.ECRTS.2019.1,
  author =	{Pazzaglia, Paolo and Mandrioli, Claudio and Maggio, Martina and Cervin, Anton},
  title =	{{DMAC: Deadline-Miss-Aware Control}},
  booktitle =	{31st Euromicro Conference on Real-Time Systems (ECRTS 2019)},
  pages =	{1:1--1:24},
  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.2019.1},
  URN =		{urn:nbn:de:0030-drops-107387},
  doi =		{10.4230/LIPIcs.ECRTS.2019.1},
  annote =	{Keywords: Weakly-Hard Real-Time Systems, Deadline Miss Handling, Control Design}
}
Document
DOI: 10.4230/LIPIcs.ECRTS.2018.10
Beyond the Weakly Hard Model: Measuring the Performance Cost of Deadline Misses

Authors: Paolo Pazzaglia, Luigi Pannocchi, Alessandro Biondi, and Marco Di Natale

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

Abstract
Most works in schedulability analysis theory are based on the assumption that constraints on the performance of the application can be expressed by a very limited set of timing constraints (often simply hard deadlines) on a task model. This model is insufficient to represent a large number of systems in which deadlines can be missed, or in which late task responses affect the performance, but not the correctness of the application. For systems with a possible temporary overload, models like the m-K deadline have been proposed in the past. However, the m-K model has several limitations since it does not consider the state of the system and is largely unaware of the way in which the performance is affected by deadline misses (except for critical failures). In this paper, we present a state-based representation of the evolution of a system with respect to each deadline hit or miss event. Our representation is much more general (while hopefully concise enough) to represent the evolution in time of the performance of time-sensitive systems with possible time overloads. We provide the theoretical foundations for our model and also show an application to a simple system to give examples of the state representations and their use.
Cite as

Paolo Pazzaglia, Luigi Pannocchi, Alessandro Biondi, and Marco Di Natale. Beyond the Weakly Hard Model: Measuring the Performance Cost of Deadline Misses. In 30th Euromicro Conference on Real-Time Systems (ECRTS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 106, pp. 10:1-10:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{pazzaglia_et_al:LIPIcs.ECRTS.2018.10,
  author =	{Pazzaglia, Paolo and Pannocchi, Luigi and Biondi, Alessandro and Di Natale, Marco},
  title =	{{Beyond the Weakly Hard Model: Measuring the Performance Cost of Deadline Misses}},
  booktitle =	{30th Euromicro Conference on Real-Time Systems (ECRTS 2018)},
  pages =	{10:1--10:22},
  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.2018.10},
  URN =		{urn:nbn:de:0030-drops-89930},
  doi =		{10.4230/LIPIcs.ECRTS.2018.10},
  annote =	{Keywords: control, real-time, cyber physical systems, weakly hard, deadline miss, performance}
}
Document
DOI: 10.4230/DARTS.4.2.4
Beyond the Weakly Hard Model: Measuring the Performance Cost of Deadline Misses (Artifact)

Authors: Paolo Pazzaglia, Luigi Pannocchi, Alessandro Biondi, and Marco Di Natale

Published in: DARTS, Volume 4, Issue 2, Special Issue of the 30th Euromicro Conference on Real-Time Systems (ECRTS 2018)

Abstract
This document provides a brief description of the artifact material related to the paper "Beyond the Weakly Hard Model: Measuring the Performance Cost of Deadline Misses". The code provided in the artifact implements the algorithms presented in the paper and all the experimental tests.
Cite as

Paolo Pazzaglia, Luigi Pannocchi, Alessandro Biondi, and Marco Di Natale. Beyond the Weakly Hard Model: Measuring the Performance Cost of Deadline Misses (Artifact). In Special Issue of the 30th Euromicro Conference on Real-Time Systems (ECRTS 2018). Dagstuhl Artifacts Series (DARTS), Volume 4, Issue 2, pp. 4:1-4:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@Article{pazzaglia_et_al:DARTS.4.2.4,
  author =	{Pazzaglia, Paolo and Pannocchi, Luigi and Biondi, Alessandro and Di Natale, Marco},
  title =	{{Beyond the Weakly Hard Model: Measuring the Performance Cost of Deadline Misses (Artifact)}},
  pages =	{4:1--4:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2018},
  volume =	{4},
  number =	{2},
  editor =	{Pazzaglia, Paolo and Pannocchi, Luigi and Biondi, Alessandro and Di Natale, Marco},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.4.2.4},
  URN =		{urn:nbn:de:0030-drops-89728},
  doi =		{10.4230/DARTS.4.2.4},
  annote =	{Keywords: control, real-time, Cyber Physical Systems weakly hard, deadline miss, performance}
}
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