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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.

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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}
}

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Scheduling and Compiling Rate-Synchronous Programs with End-To-End Latency Constraints

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