Senior Lecturer
Email: rgran@unizar.es
Address: Campus Río Ebro, University of Zaragoza
C/María de Luna 1, Ada Byron Building,
50018, Zaragoza, Spain
ABOUT ME
Rubén Gran Tejero graduated in Computer Science from the University of Zaragoza, Spain. He received his Ph.D. from the Polytechnic University of Catalonia (UPC), Spain, in 2010. Since 2010, he has been an Associate Professor at the Department of Computer Science and Systems Engineering, University of Zaragoza. His research interests include hard real-time systems, hardware for reducing worst-case execution time and energy consumption, efficient processor microarchitecture, and effective programming for parallel and heterogeneous systems. Dr. Gran Tejero is member of the Aragon Institute of Engineering Research (I3A) and the Spanish Society of Computer Architecture (SARTECO).
PUBLICATIONS
2022
Proceedings Articles
Gracia, Darío Suárez; Valero, Alejandro; Tejero, Rubén Gran; Villarroya-Gaudó, María; Viñals, Víctor
peRISCVcope: A Tiny Teaching-Oriented RISC-V Interpreter Proceedings Article
In: Proceedings of the 37th Conference on Design of Circuits and Integrated Circuits (DCIS 2022), pp. 1-6, 2022, ISBN: 978-1-6654-5950-1.
@inproceedings{Gracia2022,
title = {peRISCVcope: A Tiny Teaching-Oriented RISC-V Interpreter},
author = {Darío Suárez Gracia and Alejandro Valero and Rubén Gran Tejero and María Villarroya-Gaudó and Víctor Viñals},
url = {https://ieeexplore.ieee.org/document/9970050},
doi = {https://doi.org/10.1109/DCIS55711.2022.9970050},
isbn = {978-1-6654-5950-1},
year = {2022},
date = {2022-11-16},
urldate = {2022-11-16},
booktitle = {Proceedings of the 37th Conference on Design of Circuits and Integrated Circuits (DCIS 2022)},
pages = {1-6},
abstract = {The fast advances of computer systems translate into a growing demand of methodologies and tools to introduce those novelties into classes. Among the plethora of those advances, virtualization has become an essential technology in almost every relevant system stack, from connected cars to hyperscaled cloud servers. However, introducing those technologies into the classroom remains a challenging task because of the huge complexity of their software components that may hinder the learning process of students. peRISCVcope aims to help in this area by proposing a tiny yet powerful interpreter to dig into virtualization technologies, such as the implementation of trap&emulate hypervisors. With less than 2,000 lines of code, and thanks to the conciseness of the RV32I base instruction set of RISC-V, peRISCVcope enables students to make virtualization knowledge their own. This paper presents our experiences developing and testing a virtualization laboratory where students implement parts of an interpreter. After the practical experience, peRISCVcope has been proved as a useful pedagogical tool, and, most importantly, students have positively rated the experience.},
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pubstate = {published},
tppubtype = {inproceedings}
}
2021
Journal Articles
Segarra, Juan; Tejero, Ruben Gran; Viñals, Víctor
A generic framework to integrate data caches in the WCET analysis of real-time systems Journal Article
In: J. Syst. Archit., vol. 120, pp. 102304, 2021.
@article{DBLP:journals/jsa/SegarraTV21,
title = {A generic framework to integrate data caches in the WCET analysis of real-time systems},
author = {Juan Segarra and Ruben Gran Tejero and Víctor Viñals},
url = {https://doi.org/10.1016/j.sysarc.2021.102304},
doi = {10.1016/j.sysarc.2021.102304},
year = {2021},
date = {2021-01-01},
urldate = {2021-01-01},
journal = {J. Syst. Archit.},
volume = {120},
pages = {102304},
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pubstate = {published},
tppubtype = {article}
}
Valero, Alejandro; Tejero, Ruben Gran; Gracia, Darío Suárez; Georgescu, Emanuel A.; Ezpeleta, Joaquín; Álvarez, Pedro; Muñoz, Adolfo; Ramos, Luis M.; Ibáñez, Pablo
A learning experience toward the understanding of abstraction-level interactions in parallel applications Journal Article
In: J. Parallel Distributed Comput., vol. 156, pp. 38–52, 2021.
@article{DBLP:journals/jpdc/ValeroTGGEAMRI21,
title = {A learning experience toward the understanding of abstraction-level
interactions in parallel applications},
author = {Alejandro Valero and Ruben Gran Tejero and Darío Suárez Gracia and Emanuel A. Georgescu and Joaquín Ezpeleta and Pedro Álvarez and Adolfo Muñoz and Luis M. Ramos and Pablo Ibáñez},
url = {https://doi.org/10.1016/j.jpdc.2021.05.008},
doi = {10.1016/j.jpdc.2021.05.008},
year = {2021},
date = {2021-01-01},
journal = {J. Parallel Distributed Comput.},
volume = {156},
pages = {38--52},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2020
Journal Articles
Valero, Alejandro; Gracia, Darío Suárez; Tejero, Rubén Gran
DC-Patch: A Microarchitectural Fault Patching Technique for GPU Register Files Journal Article
In: IEEE Access, vol. 8, pp. 173276-173288, 2020, ISSN: 2169-3536.
@article{Valero2020,
title = {DC-Patch: A Microarchitectural Fault Patching Technique for GPU Register Files},
author = {Alejandro Valero and Darío Suárez Gracia and Rubén Gran Tejero},
url = {https://ieeexplore.ieee.org/document/9203907},
doi = {https://doi.org/10.1109/ACCESS.2020.3025899},
issn = {2169-3536},
year = {2020},
date = {2020-09-22},
urldate = {2020-09-22},
journal = {IEEE Access},
volume = {8},
pages = {173276-173288},
abstract = {The ever-increasing parallelism demand of General-Purpose Graphics Processing Unit (GPGPU) applications pushes toward larger and more energy-hungry register files in successive GPU generations. Reducing the supply voltage beyond its safe limit is an effective way to improve the energy efficiency of register files. However, at these operating voltages, the reliability of the circuit is compromised. This work aims to tolerate permanent faults from process variations in large GPU register files operating below the safe supply voltage limit. To do so, this paper proposes a microarchitectural patching technique, DC-Patch, exploiting the inherent data redundancy of applications to compress registers at run-time with neither compiler assistance nor instruction set modifications. Instead of disabling an entire faulty register file entry, DC-Patch leverages the reliable cells within a faulty entry to store compressed register values. Experimental results show that, with more than a third of faulty register entries, DC-Patch ensures a reliable operation of the register file and reduces the energy consumption by 47% with respect to a conventional register file working at nominal supply voltage. The energy savings are 21% compared to a voltage noise smoothing scheme operating at the safe supply voltage limit. These benefits are obtained with less than 2 and 6% impact on the system performance and area, respectively.},
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pubstate = {published},
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Pedro-Zapater, Alba; Rodríguez, Clemente; Segarra, Juan; Tejero, Rubén Gran; Viñals-Yúfera, Víctor
Ideal and Predictable Hit Ratio for Matrix Transposition in Data Caches Journal Article
In: Mathematics, vol. 8, no. 2, pp. 184, 2020.
@article{pedro2020ideal,
title = {Ideal and Predictable Hit Ratio for Matrix Transposition in Data Caches},
author = {Alba Pedro-Zapater and Clemente Rodríguez and Juan Segarra and Rubén Gran Tejero and Víctor Viñals-Yúfera},
year = {2020},
date = {2020-01-01},
journal = {Mathematics},
volume = {8},
number = {2},
pages = {184},
publisher = {Multidisciplinary Digital Publishing Institute},
keywords = {},
pubstate = {published},
tppubtype = {article}
}