2 Search Results for "Pouzet, Marc"

Document
DOI: 10.4230/LIPIcs.ECRTS.2023.1
Scheduling and Compiling Rate-Synchronous Programs with End-To-End Latency Constraints

Authors: Timothy Bourke, Vincent Bregeon, and Marc Pouzet

Published in: LIPIcs, Volume 262, 35th Euromicro Conference on Real-Time Systems (ECRTS 2023)

Abstract
We present an extension of the synchronous-reactive model for specifying multi-rate systems. A set of periodically executed components and their communication dependencies are expressed in a Lustre-like programming language with features for load balancing, resource limiting, and specifying end-to-end latencies. The language abstracts from execution time and phase offsets. This permits simple clock typing rules and a stream-based semantics, but requires each component to execute within an overall base period. A program is compiled to a single periodic task in two stages. First, Integer Linear Programming is used to determine phase offsets using standard encodings for dependencies and load balancing, and a novel encoding for end-to-end latency. Second, a code generation scheme is adapted to produce step functions. As a result, components are synchronous relative to their respective rates, but not necessarily simultaneous relative to the base period. This approach has been implemented in a prototype compiler and validated on an industrial application.
Cite as

Timothy Bourke, Vincent Bregeon, and Marc Pouzet. Scheduling and Compiling Rate-Synchronous Programs with End-To-End Latency Constraints. In 35th Euromicro Conference on Real-Time Systems (ECRTS 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 262, pp. 1:1-1:22, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2023)

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@InProceedings{bourke_et_al:LIPIcs.ECRTS.2023.1,
  author =	{Bourke, Timothy and Bregeon, Vincent and Pouzet, Marc},
  title =	{{Scheduling and Compiling Rate-Synchronous Programs with End-To-End Latency Constraints}},
  booktitle =	{35th Euromicro Conference on Real-Time Systems (ECRTS 2023)},
  pages =	{1:1--1:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-280-8},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{262},
  editor =	{Papadopoulos, Alessandro V.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2023.1},
  URN =		{urn:nbn:de:0030-drops-180301},
  doi =		{10.4230/LIPIcs.ECRTS.2023.1},
  annote =	{Keywords: synchronous-reactive, integer linear programming, code generation}
}
Document
DOI: 10.4230/LITES-v002-i002-a001
From Dataflow Specification to Multiprocessor Partitioned Time-triggered Real-time Implementation

Authors: Thomas Carle, Dumitru Potop-Butucaru, Yves Sorel, and David Lesens

Published in: LITES, Volume 2, Issue 2 (2015). Leibniz Transactions on Embedded Systems, Volume 2, Issue 2

Abstract
Our objective is to facilitate the development of complex time-triggered systems by automating the allocation and scheduling steps. We show that full automation is possible while taking into account the elements of complexity needed by a complex embedded control system. More precisely, we consider deterministic functional specifications provided (as often in an industrial setting) by means of synchronous data-flow models with multiple modes and multiple relative periods. We first extend this functional model with an original real-time characterization that takes advantage of our time-triggered framework to provide a simpler representation of complex end-to-end flow requirements. We also extend our specifications with additional non-functional properties specifying partitioning, allocation, and preemptability constraints. Then, we provide novel algorithms for the off-line scheduling of these extended specifications onto partitioned time-triggered architectures à la ARINC 653. The main originality of our work is that it takes into account at the same time multiple complexity elements: various types of non-functional properties (real-time, partitioning, allocation, preemptability) and functional specifications with conditional execution and multiple modes. Allocation of time slots/windows to partitions can be fully or partially provided, or synthesized by our tool. Our algorithms allow the automatic allocation and scheduling onto multi-processor (distributed) systems with a global time base, taking into account communication costs. We demonstrate our technique on a model of space flight software system with strong real-time determinism requirements.
Cite as

Thomas Carle, Dumitru Potop-Butucaru, Yves Sorel, and David Lesens. From Dataflow Specification to Multiprocessor Partitioned Time-triggered Real-time Implementation. In LITES, Volume 2, Issue 2 (2015). Leibniz Transactions on Embedded Systems, Volume 2, Issue 2, pp. 01:1-01:30, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2015)

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@Article{carle_et_al:LITES-v002-i002-a001,
  author =	{Carle, Thomas and Potop-Butucaru, Dumitru and Sorel, Yves and Lesens, David},
  title =	{{From Dataflow Specification to Multiprocessor Partitioned Time-triggered Real-time Implementation}},
  booktitle =	{LITES, Volume 2, Issue 2 (2015)},
  pages =	{01:1--01:30},
  journal =	{Leibniz Transactions on Embedded Systems},
  ISSN =	{2199-2002},
  year =	{2015},
  volume =	{2},
  number =	{2},
  editor =	{Carle, Thomas and Potop-Butucaru, Dumitru and Sorel, Yves and Lesens, David},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LITES-v002-i002-a001},
  doi =		{10.4230/LITES-v002-i002-a001},
  annote =	{Keywords: Time-triggered, Off-line real-time scheduling, Temporal partitioning}
}
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