3 Search Results for "Ozaktas, Haluk"

Document
DOI: 10.4230/LIPIcs.ECRTS.2025.11
Bounding the WCET of a GPU Thread Block with a Multi-Phase Representation of Warps Execution

Authors: Louison Jeanmougin, Thomas Carle, and Christine Rochange

Published in: LIPIcs, Volume 335, 37th Euromicro Conference on Real-Time Systems (ECRTS 2025)

Abstract
This paper proposes to model the Worst-Case Execution Time (WCET) of a GPU thread block as the Worst-Case Response Time (WCRT) of the warps composing the block. Inspired by the WCRT analyzes for classical CPU tasks, the response time of a warp is modeled as its execution time in isolation added to an interference term that accounts for the execution of higher priority warps. We provide an algorithm to build a representation of the execution of each warp of a thread block that distinguishes phases of execution on the functional units and phases of idleness due to operations latency. A simple formula relying on this model is then proposed to safely upper bound the WCRT of warps scheduled under greedy policies such as Greedy-Then-Oldest (GTO) or Loose Round-Robin (LRR). We experimented our approach using simulations of kernels from a GPU benchmark suite on the Accel-Sim simulator. We also evaluated the model on a GPU program that is likely to be found in safety critical systems : SGEMM (Single-precision GEneral Matrix Multiplication). This work constitutes a promising first building block of an analysis pipeline for enabling static WCET computation on GPUs.
Cite as

Louison Jeanmougin, Thomas Carle, and Christine Rochange. Bounding the WCET of a GPU Thread Block with a Multi-Phase Representation of Warps Execution. In 37th Euromicro Conference on Real-Time Systems (ECRTS 2025). Leibniz International Proceedings in Informatics (LIPIcs), Volume 335, pp. 11:1-11:26, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2025)

Copy BibTex To Clipboard

@InProceedings{jeanmougin_et_al:LIPIcs.ECRTS.2025.11,
  author =	{Jeanmougin, Louison and Carle, Thomas and Rochange, Christine},
  title =	{{Bounding the WCET of a GPU Thread Block with a Multi-Phase Representation of Warps Execution}},
  booktitle =	{37th Euromicro Conference on Real-Time Systems (ECRTS 2025)},
  pages =	{11:1--11:26},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-377-5},
  ISSN =	{1868-8969},
  year =	{2025},
  volume =	{335},
  editor =	{Mancuso, Renato},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2025.11},
  URN =		{urn:nbn:de:0030-drops-235898},
  doi =		{10.4230/LIPIcs.ECRTS.2025.11},
  annote =	{Keywords: GPU, WCET analysis}
}
Document
DOI: 10.4230/OASIcs.WCET.2015.1
A Framework to Quantify the Overestimations of Static WCET Analysis

Authors: Hugues Cassé, Haluk Ozaktas, and Christine Rochange

Published in: OASIcs, Volume 47, 15th International Workshop on Worst-Case Execution Time Analysis (WCET 2015)

Abstract
To reduce complexity while computing an upper bound on the worst-case execution time, static WCET analysis performs over-approximations. This feeds the general feeling that static WCET estimations can be far above the real WCET. This feeling is strengthened when these estimations are compared to measured execution times: generally, it is very unlikely to capture the worstcase from observations, then the difference between the highest watermark and the proven WCET upper bound might be considerable. In this paper, we introduce a framework to quantify the possible overestimation on WCET upper bounds obtained by static analysis. The objective is to derive a lower bound on the WCET to complement the upper bound.
Cite as

Hugues Cassé, Haluk Ozaktas, and Christine Rochange. A Framework to Quantify the Overestimations of Static WCET Analysis. In 15th International Workshop on Worst-Case Execution Time Analysis (WCET 2015). Open Access Series in Informatics (OASIcs), Volume 47, pp. 1-10, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)

Copy BibTex To Clipboard

@InProceedings{casse_et_al:OASIcs.WCET.2015.1,
  author =	{Cass\'{e}, Hugues and Ozaktas, Haluk and Rochange, Christine},
  title =	{{A Framework to Quantify the Overestimations of Static WCET Analysis}},
  booktitle =	{15th International Workshop on Worst-Case Execution Time Analysis (WCET 2015)},
  pages =	{1--10},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-95-8},
  ISSN =	{2190-6807},
  year =	{2015},
  volume =	{47},
  editor =	{Cazorla, Francisco J.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.WCET.2015.1},
  URN =		{urn:nbn:de:0030-drops-52517},
  doi =		{10.4230/OASIcs.WCET.2015.1},
  annote =	{Keywords: Static WCET analysis, uncertainty, overestimation, cache analysis}
}
Document
DOI: 10.4230/OASIcs.WCET.2013.11
Automatic WCET Analysis of Real-Time Parallel Applications

Authors: Haluk Ozaktas, Christine Rochange, and Pascal Sainrat

Published in: OASIcs, Volume 30, 13th International Workshop on Worst-Case Execution Time Analysis (2013)

Abstract
Tomorrow's real-time embedded systems will be built upon multicore architectures. This raises two challenges. First, shared resources should be arbitrated in such a way that the WCET of independent threads running concurrently can be computed: in this paper, we assume that timepredictable multicore architectures are available. The second challenge is to develop software that achieves a high level of performance without impairing timing predictability. We investigate parallel software based on the POSIX threads standard and we show how the WCET of a parallel program can be analysed. We report experimental results obtained for typical parallel programs with an extended version of the OTAWA toolset.
Cite as

Haluk Ozaktas, Christine Rochange, and Pascal Sainrat. Automatic WCET Analysis of Real-Time Parallel Applications. In 13th International Workshop on Worst-Case Execution Time Analysis. Open Access Series in Informatics (OASIcs), Volume 30, pp. 11-20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2013)

Copy BibTex To Clipboard

@InProceedings{ozaktas_et_al:OASIcs.WCET.2013.11,
  author =	{Ozaktas, Haluk and Rochange, Christine and Sainrat, Pascal},
  title =	{{Automatic WCET Analysis of Real-Time Parallel Applications}},
  booktitle =	{13th International Workshop on Worst-Case Execution Time Analysis},
  pages =	{11--20},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-54-5},
  ISSN =	{2190-6807},
  year =	{2013},
  volume =	{30},
  editor =	{Maiza, Claire},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.WCET.2013.11},
  URN =		{urn:nbn:de:0030-drops-41186},
  doi =		{10.4230/OASIcs.WCET.2013.11},
  annote =	{Keywords: WCET analysis, parallel programming, thread synchronisation}
}
  • Refine by Type
  • 3 Document/PDF
  • 1 Document/HTML

  • Refine by Publication Year
  • 1 2025
  • 1 2015
  • 1 2013

  • Refine by Author
  • 3 Rochange, Christine
  • 2 Ozaktas, Haluk
  • 1 Carle, Thomas
  • 1 Cassé, Hugues
  • 1 Jeanmougin, Louison
  • Show More...

  • Refine by Series/Journal
  • 1 LIPIcs
  • 2 OASIcs

  • Refine by Classification
  • 1 Computer systems organization → Embedded systems
  • 1 Computer systems organization → Real-time systems

  • Refine by Keyword
  • 2 WCET analysis
  • 1 GPU
  • 1 Static WCET analysis
  • 1 cache analysis
  • 1 overestimation
  • Show More...

Any Issues?
X

Feedback on the Current Page

CAPTCHA

Thanks for your feedback!

Feedback submitted to Dagstuhl Publishing

Could not send message

Please try again later or send an E-mail
© 2023-2026 Schloss Dagstuhl – LZI GmbH Schloss Dagstuhl – LZI GmbH About DROPS Imprint Privacy Contact