Response time bounds for DAG tasks with arbitrary intra-task priority assignment

Qingqiang He, Mingsong Lv, Nan Guan

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

9 Citations (Scopus)


Most parallel real-time applications can be modeled as directed acyclic graph (DAG) tasks. Intra-task priority assignment can reduce the nondeterminism of runtime behavior of DAG tasks, possibly resulting in a smaller worst-case response time. However, intra-task priority assignment incurs dependencies between different parts of the graph, making it a challenging problem to compute the response time bound. Existing work on intra-task task priority assignment for DAG tasks is subject to the constraint that priority assignment must comply with the topological order of the graph, so that the response time bound can be computed in polynomial time. In this paper, we relax this constraint and propose a new method to compute response time bound of DAG tasks with arbitrary priority assignment. With the benefit of our new method, we present a simple but effective priority assignment policy, leading to smaller response time bounds. Comprehensive evaluation with both single-DAG systems and multi-DAG systems demonstrates that our method outperforms the state-of-the-art method with a considerable margin.

Original languageEnglish
Title of host publication33rd Euromicro Conference on Real-Time Systems, ECRTS 2021
EditorsBjorn B. Brandenburg
PublisherSchloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing
ISBN (Electronic)9783959771924
Publication statusPublished - 1 Jul 2021
Event33rd Euromicro Conference on Real-Time Systems, ECRTS 2021 - Virtual, Online
Duration: 5 Jul 20219 Jul 2021

Publication series

NameLeibniz International Proceedings in Informatics, LIPIcs
ISSN (Print)1868-8969


Conference33rd Euromicro Conference on Real-Time Systems, ECRTS 2021
CityVirtual, Online


  • DAG tasks
  • Intra-task priority assignment
  • Real-time systems
  • Response time bound

ASJC Scopus subject areas

  • Software


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