Now showing items 1-20 of 32

  • A cache design for probabilistically analysable real-time systems 

    Kosmidis, Leonidas; Abella Ferrer, Jaume; Quiñones, Eduardo; Cazorla Almeida, Francisco Javier (2013)
    Conference report
    Restricted access - publisher's policy
    Caches provide significant performance improvements, though their use in real-time industry is low because current WCET analysis tools require detailed knowledge of program's cache accesses to provide tight WCET estimates. ...
  • Achieving timing composability with measurement-based probabilistic timing analysis 

    Kosmidis, Leonidas; Quiñones, Eduardo; Abella Ferrer, Jaume; Vardanega, Tulio; Cazorla Almeida, Francisco Javier (2013)
    Conference report
    Restricted access - publisher's policy
    Probabilistic Timing Analysis (PTA) allows complex hardware acceleration features, which defeat classic timing analysis, to be used in hard real-time systems. PTA can do that because it drastically reduces intrinsic ...
  • A confidence assessment of WCET estimates for software time randomized caches 

    Benedicte Illescas, Pedro; Kosmidis, Leonidas; Quiñones, Eduardo; Abella Ferrer, Jaume; Cazorla Almeida, Francisco Javier (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    Obtaining Worst-Case Execution Time (WCET) estimates is a required step in real-time embedded systems during software verification. Measurement-Based Probabilistic Timing Analysis (MBPTA) aims at obtaining WCET estimates ...
  • An open benchmark implementation for multi-CPU multi-GPU pedestrian detection in automotive systems 

    Trompouki, Matina M.; Kosmidis, Leonidas; Navarro, Nacho (IEEE, 2017-12-14)
    Conference lecture
    Open Access
    Modern and future automotive systems incorporate several Advanced Driving Assistance Systems (ADAS). Those systems require significant performance that cannot be provided with traditional automotive processors and programming ...
  • Applying measurement-based probabilistic timing analysis to buffer resources 

    Kosmidis, Leonidas; Vardanega, Tulio; Abella Ferrer, Jaume; Quiñones, Eduardo; Cazorla Almeida, Francisco Javier (2013)
    Conference report
    Open Access
    The use of complex hardware makes it difficult for current timing analysis techniques to compute trustworthy and tight worst-case execution time (WCET) bounds. Those techniques require detailed knowledge of the internal ...
  • Assessing the Adherence of an Industrial Autonomous Driving Framework to ISO 26262 Software Guidelines 

    Tabani, Hamid; Kosmidis, Leonidas; Abella, Jaume; Cazorla, Francisco J.; Bernat, Guillem (Association for Computing Machinery (ACM), 2019-06-06)
    Conference lecture
    Open Access
    The complexity and size of Autonomous Driving (AD) software are comparably higher than that of software implementing other (standard) functionalities in the car. To make things worse, a big fraction of AD software is not ...
  • Brook Auto: High-Level Certification-Friendly Programming for GPU-powered Automotive Systems 

    Trompouki, Matina M.; Kosmidis, Leonidas (Association for Computing Machinery (ACM), 2018)
    Conference lecture
    Open Access
    Modern automotive systems require increased performance to implement Advanced Driving Assistance Systems (ADAS). GPU-powered platforms are promising candidates for such computational tasks, however current low-level ...
  • Brook GLES Pi: democratising accelerator programming 

    Trompouki, Matina Maria; Kosmidis, Leonidas (Association for Computing Machinery (ACM), 2018-08-10)
    Conference lecture
    Open Access
    Nowadays computing is heavily-based on accelerators, however, the cost of the hardware equipment prevents equal access to heterogeneous programming. In this work we present Brook GLES Pi, a port of the accelerator programming ...
  • Bus designs for time-probabilistic multicore processors 

    Jalle Ibarra, Javier; Kosmidis, Leonidas; Abella Ferrer, Jaume; Quiñones, Eduardo; Cazorla Almeida, Francisco Javier (European Interactive Digital Advertising Alliance (EDAA), 2014)
    Conference report
    Restricted access - publisher's policy
    Probabilistic Timing Analysis (PTA) reduces the amount of information needed to provide tight WCET estimates in real-time systems with respect to classic timing analysis. PTA imposes new requirements on hardware design ...
  • Containing timing-related certification cost in automotive systems deploying complex hardware 

    Kosmidis, Leonidas; Quiñones, Eduardo; Abella Ferrer, Jaume; Farrall, Glenn; Wartel, Franck; Cazorla Almeida, Francisco Javier (Association for Computing Machinery (ACM), 2014)
    Conference report
    Restricted access - publisher's policy
    Measurement-Based Probabilistic Timing Analysis (MBPTA) techniques simplify deriving tight and trustworthy WCET estimates for industrial-size programs running on complex processors. MBPTA poses some requirements on the ...
  • DTM: degraded test mode for fault-aware probabilistic timing analysis 

    Slijepcevic, Mladen; Kosmidis, Leonidas; Abella Ferrer, Jaume; Quiñones, Eduardo; Cazorla Almeida, Francisco Javier (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Conference report
    Restricted access - publisher's policy
    Existing timing analysis techniques to derive Worst-Case Execution Time (WCET) estimates assume that hardware in the target platform (e.g., the CPU) is fault-free. Given the performance requirements increase in current ...
  • Dynamic software randomisation: Lessons learnec from an aerospace case study 

    Cros, Fabrice; Kosmidis, Leonidas; Wartel, Franck; Morales, David; Abella, Jaume; Broster, Ian; Cazorla, Francisco J. (2017-05-15)
    Conference lecture
    Open Access
    Timing Validation and Verification (V&V) is an important step in real-time system design, in which a system's timing behaviour is assessed via Worst Case Execution Time (WCET) estimation and scheduling analysis. For WCET ...
  • Enabling caches in probabilistic timing analysis 

    Kosmidis, Leonidas (Universitat Politècnica de Catalunya, 2017-09-06)
    Doctoral thesis
    Open Access
    Hardware and software complexity of future critical real-time systems challenges the scalability of traditional timing analysis methods. Measurement-Based Probabilistic Timing Analysis (MBPTA) has recently emerged as an ...
  • Fitting processor architectures for measurement-based probabilistic timing analysis 

    Kosmidis, Leonidas; Quiñones, Eduardo; Abella Ferrer, Jaume; Vardanega, Tullio; Hernández, Carles; Gianarro, Andrea; Broster, Ian; Cazorla Almeida, Francisco Javier (2016-11-01)
    Article
    Open Access
    The pressing market demand for competitive performance/cost ratios compels Critical Real-Time Embedded Systems industry to employ feature-rich hardware. The ensuing rise in hardware complexity however makes worst-case ...
  • Generating and Exploiting Deep Learning Variants to Increase Heterogeneous Resource Utilization in the NVIDIA Xavier 

    Pujol, Roger; Tabani, Hamid; Kosmidis, Leonidas; Mezzetti, Enrico; Abella, Jaume; Cazorla, Francisco J. (2019)
    Conference lecture
    Open Access
    Deep learning-based solutions and, in particular, deep neural networks (DNNs) are at the heart of several functionalities in critical-real time embedded systems (CRTES) from vision-based perception (object detection and ...
  • High-Integrity GPU Designs for Critical Real-Time Automotive Systems 

    Alcaide, Sergi; Kosmidis, Leonidas; Hernandez, Carles; Abella, Jaume (IEEE, 2019-04-16)
    Conference lecture
    Open Access
    Autonomous Driving (AD) imposes the use of highperformance hardware, such as GPUs, to perform object recognition and tracking in real-time. However, differently to the consumer electronics market, critical real-time AD ...
  • Industrial experiences with resource management under software randomization in ARINC653 avionics environments 

    Kosmidis, Leonidas; Maxim, Cristian; Jegu, Victor; Vatrinet, Francis; Cazorla, Francisco J. (Association for Computing Machinery (ACM), 2018-11-05)
    Conference lecture
    Open Access
    Injecting randomization in different layers of the computing platform has been shown beneficial for security, resilience to software bugs and timing analysis. In this paper, with focus on the latter, we show our experience ...
  • MC2: Multicore and Cache Analysis via Deterministic and Probabilistic Jitter Bounding 

    Díaz, Enrique; Fernández, Mikel; Kosmidis, Leonidas; Mezzetti, Enrico; Hernandez, Carles; Abella, Jaume; Cazorla, Francisco J. (Springer International Publishing, 2017-05-30)
    Conference lecture
    Open Access
    In critical domains, reliable software execution is increasingly involving aspects related to the timing dimension. This is due to the advent of high-performance (complex) hardware, used to provide the rising levels of ...
  • Measurement-based probabilistic timing analysis for multi-path programs 

    Cucu Grosjean, Liliana; Santinelli, Luca; Houston, Michael; Lo, Code; Vardanega, Tulio; Kosmidis, Leonidas; Abella Ferrer, Jaume; Mezzetti, Enrico; Quiñones, Eduardo; Cazorla Almeida, Francisco Javier (2012)
    Conference report
    Restricted access - publisher's policy
    The rigorous application of static timing analysis requires a large and costly amount of detail knowledge on the hardware and software components of the system. Probabilistic Timing Analysis has potential for reducing the ...
  • Measurement-based probabilistic timing analysis: Lessons from an integrated-modular avionics case study 

    Wartel, Franck; Kosmidis, Leonidas; Lo, Code; Triquet, Benoit; Quiñones, Eduardo; Abella Ferrer, Jaume; Gogonel, Adriana; Baldovin, Andrea; Mezzetti, Enrico; Cucu Grosjean, Liliana; Vardanega, Tulio; Cazorla Almeida, Francisco Javier (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Conference report
    Restricted access - publisher's policy
    Probabilistic Timing Analysis (PTA) in general and its measurement-based variant called MBPTA in particular can mitigate some of the problems that impair current worst-case execution time (WCET) analysis techniques. MBPTA ...