Recent Submissions

  • Analyzing and improving hardware modeling of Accel-Sim 

    Huerta Gañán, Rodrigo; Abaie Shoushtary, Mojtaba; González Colás, Antonio María (2023-10)
    Research report
    Open Access
    GPU architectures have become popular for executing generalpurpose programs. Their many-core architecture supports a large number of threads that run concurrently to hide the latency among dependent instructions. In modern ...
  • Performance-oriented digital twins for packet and optical networks 

    Cabellos Aparicio, Alberto; Janz, Christopher; Almasan Puscas, Felician Paul; Ferriol Galmés, Miquel; Barlet Ros, Pere; Paillissé Vilanova, Jordi; Xiao, Shihan; Shi, Xiang; Cheng, Xiangle; Guo, Aihua; Perino, Diego; Lopez, Diego; Pastor Perales, Antonio Agustín (2023-10-23)
    Research report
    Open Access
    This draft introduces the concept of a Network Digital Twin (NDT), including the architecture as well as the interfaces. Then two specific instances of the NDT are introduced, the first one for packet networks. This ...
  • Reliability analysis in a wireless ISP 

    Cerdà Alabern, Llorenç; Gemmi, Gabriele; Maccari, Leonardo (2023-03-14)
    Research report
    Open Access
    This brief report investigates different quality parameters to assess the reliability in Wireless Internet Service Providers, WISPs. In our analysis we use a Markov chain approach. We investigate the time to failure, failure ...
  • Demonstration of a library prototype to build LoRa mesh networks for the IoT 

    Miquel Solé, Joan; Miralles Nogués, Sergi; Pueyo Centelles, Roger; Freitag, Fèlix (2022-02)
    Research report
    Open Access
    LoRa has become popular in the Internet of Things (IoT) domain as a Low Power, Wide Area Network (LPWAN) radio technology providing low-power and long-range communi- cation. In a typical IoT application, the LoRaWAN ...
  • A minimalistic distance-vector routing protocol for LoRa mesh networks 

    Pueyo Centelles, Roger; Freitag, Fèlix; Meseguer Pallarès, Roc; Navarro Moldes, Leandro (2021-06-15)
    Research report
    Open Access
    LoRa has gained traction in the Internet of Things (IoT) domain as a Low Power, Wide Area Network(LPWAN) radio technology, providing low-power and long-range communication in the sub-GHz band. Most often it is used as part ...
  • Towards resilient EU HPC systems: A blueprint 

    Radojković, Petar; Marazakis, Manolis; Carpenter, Paul Matthew; Jeyapaul, Reiley; Gizopoulos, Dimitris; Schulz, Martin; Armejach Sanosa, Adrià; Ayguadé Parra, Eduard; Canal Corretger, Ramon; Moretó Planas, Miquel; Salami, Behzad; Unsal, Osman Sabri (2020-04)
    Research report
    Open Access
    This document aims to spearhead a Europe-wide discussion on HPC system resilience and to help the European HPC community define best practices for resilience. We analyse a wide range of state-of-the-art resilience mechanisms ...
  • Optimizing sparse matrix-vector multiplication in NEC SX-Aurora vector engine 

    Gómez Crespo, Constantino; Casas, Marc; Mantovani, Filippo; Focht, Erich (2020-06-26)
    Research report
    Open Access
    Sparse Matrix-Vector multiplication (SpMV) is an essential piece of code used in many High Performance Computing (HPC) applications. As previous literature shows, achieving efficient vectorization and performance in modern ...
  • LoRaMoto: a LoRa-based communication system for coordinated response in an earthquake aftermath (excerpt) 

    Pueyo Centelles, Roger; Freitag, Fèlix; Meseguer Pallarès, Roc; Navarro Moldes, Leandro (2019-07-26)
    Research report
    Open Access
    Response of emergency units after natural disasters, such as earthquakes, has to be coordinated, fast and efficient in order to rescue and care for the victims, keeping all the population –and the units themselves– safe ...