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Documents authored by Soliman, Muhammad Refaat

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Soliman, Muhammad Refaat

Document
DOI: 10.4230/LIPIcs.ECRTS.2017.24
WCET-Driven Dynamic Data Scratchpad Management With Compiler-Directed Prefetching

Authors: Muhammad Refaat Soliman and Rodolfo Pellizzoni

Published in: LIPIcs, Volume 76, 29th Euromicro Conference on Real-Time Systems (ECRTS 2017)

Abstract
In recent years, the real-time community has produced a variety of approaches targeted at managing on-chip memory (scratchpads and caches) in a predictable way. However, to obtain safe WCET bounds, such techniques generally assume that the processor is stalled while waiting to reload the content of the on-chip memory; hence, they are less effective at hiding main memory latency compared to speculation-based techniques, such as hardware prefetching, that are largely used in general-purpose systems. In this work, we introduce a novel compiler-directed prefetching scheme for scratchpad memory that effectively hides the latency of main memory accesses by overlapping data transfers with the program execution. We implement and test an automated program compilation and optimization flow within the LLVM framework, and we show how to obtain improved WCET bounds through static analysis.
Cite as

Muhammad Refaat Soliman and Rodolfo Pellizzoni. WCET-Driven Dynamic Data Scratchpad Management With Compiler-Directed Prefetching. In 29th Euromicro Conference on Real-Time Systems (ECRTS 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 76, pp. 24:1-24:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{soliman_et_al:LIPIcs.ECRTS.2017.24,
  author =	{Soliman, Muhammad Refaat and Pellizzoni, Rodolfo},
  title =	{{WCET-Driven Dynamic Data Scratchpad Management With Compiler-Directed Prefetching}},
  booktitle =	{29th Euromicro Conference on Real-Time Systems (ECRTS 2017)},
  pages =	{24:1--24:23},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-037-8},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{76},
  editor =	{Bertogna, Marko},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2017.24},
  URN =		{urn:nbn:de:0030-drops-71756},
  doi =		{10.4230/LIPIcs.ECRTS.2017.24},
  annote =	{Keywords: scratchpad, LLVM, prefetching, real-time, genetic algorithm}
}

Soliman, Muhammad R.

Document
DOI: 10.4230/LIPIcs.ECRTS.2019.4
PREM-Based Optimal Task Segmentation Under Fixed Priority Scheduling

Authors: Muhammad R. Soliman and Rodolfo Pellizzoni

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

Abstract
Recently, a large number of works have discussed scheduling tasks consisting of a sequence of memory phases, where code and data are moved between main memory and local memory, and computation phases, where the task executes based on the content of local memory only; the key idea is to prevent main memory contention by scheduling the memory phase of one task in parallel with computation phases of tasks running on other cores. This paper provides two main contributions: (1) we present a compiler-level tool, based on the LLVM intermediate representation, that automatically converts a program into a conditional sequence of segments comprising memory and computation phases; (2) we propose an algorithm to find optimal segmentation decisions for a task set scheduled according to a fixed-priority partitioned scheme. Our evaluation shows that the proposed framework can be feasibly applied to realistic programs, and vastly overperforms a baseline greedy approach.
Cite as

Muhammad R. Soliman and Rodolfo Pellizzoni. PREM-Based Optimal Task Segmentation Under Fixed Priority Scheduling. In 31st Euromicro Conference on Real-Time Systems (ECRTS 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 133, pp. 4:1-4:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

Copy BibTex To Clipboard

@InProceedings{soliman_et_al:LIPIcs.ECRTS.2019.4,
  author =	{Soliman, Muhammad R. and Pellizzoni, Rodolfo},
  title =	{{PREM-Based Optimal Task Segmentation Under Fixed Priority Scheduling}},
  booktitle =	{31st Euromicro Conference on Real-Time Systems (ECRTS 2019)},
  pages =	{4:1--4:23},
  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.2019.4},
  URN =		{urn:nbn:de:0030-drops-107417},
  doi =		{10.4230/LIPIcs.ECRTS.2019.4},
  annote =	{Keywords: PREM, LLVM, scratchpad memory, scheduling, program segmentation}
}
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