Browsing by Author "Cazorla Almeida, Francisco Javier"
Now showing items 1-20 of 78
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A cache design for probabilistically analysable real-time systems
(2013)
Conference report
Restricted access - publisher's policyCaches 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
(2013)
Conference report
Restricted access - publisher's policyProbabilistic 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
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference report
Open AccessObtaining 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 analyzable memory controller for hard real-time CMPs
(2010-02-05)
Article
Open AccessMulticore processors (CMPs) represent a good solution to provide the performance required by current and future hard real-time systems. However, it is difficult to compute a tight WCET estimation for CMPs due to interferences ... -
Applying measurement-based probabilistic timing analysis to buffer resources
(2013)
Conference report
Open AccessThe 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 ... -
Architectural support for real-time task scheduling in SMT processors
(2005)
External research report
Open AccessIn Simultaneous Multithreaded (SMT) architectures most hardware resources are shared between threads. This provides a good cost/performance trade-off which renders these architectures suitable for use in embedded systems. ... -
Bus designs for time-probabilistic multicore processors
(European Interactive Digital Advertising Alliance (EDAA), 2014)
Conference report
Restricted access - publisher's policyProbabilistic 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 ... -
Characterizing the resource-sharing levels of the UltraSparc T2 processor
(Association for Computing Machinery (ACM), 2009)
Conference report
Restricted access - publisher's policyThread level parallelism (TLP) has become a popular trend to improve processor performance, overcoming the limitations of extracting instruction level parallelism. Each TLP paradigm, such as Simultaneous Multithreading or ... -
Containing timing-related certification cost in automotive systems deploying complex hardware
(Association for Computing Machinery (ACM), 2014)
Conference report
Restricted access - publisher's policyMeasurement-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 ... -
Contention-aware performance monitoring counter support for real-time MPSoCs
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference lecture
Open AccessTasks running in MPSoCs experience contention delays when accessing MPSoC’s shared resources, complicating task timing analysis and deriving execution time bounds. Understanding the Actual Contention Delay (ACD) each task ... -
Contention in multicore hardware shared resources: Understanding of the state of the art
(Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2014)
Conference report
Open AccessThe real-time systems community has over the years devoted considerable attention to the impact on execution timing that arises from contention on access to hardware shared resources. The relevance of this problem has been ... -
Data bus slicing for contention-free multicore real-time memory systems
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference report
Open AccessMemory access contention is one of the main contributors to tasks' execution time variability in real-Time multicores. Existing techniques to control memory contention based on time-sharing memory access do not scale well ... -
Dcache Warn: an I-fetch policy to increase SMT efficiency
(Institute of Electrical and Electronics Engineers (IEEE), 2004)
Conference report
Open AccessSimultaneous multithreading (SMT) processors increase performance by executing instructions from multiple threads simultaneously. These threads share the processor's resources, but also compete for them. In this environment, ... -
Deconstructing bus access control policies for real-time multicores
(Institute of Electrical and Electronics Engineers (IEEE), 2013)
Conference report
Restricted access - publisher's policyMulticores may satisfy the growing performance requirements of critical Real-Time systems which has made industry to consider them for future real-time systems. In a multicore, the bus contention-control policy plays a key ... -
Design and integration of hierarchical-placement multi-level caches for real-Time systems
(Institute of Electrical and Electronics Engineers (IEEE), 2018)
Conference report
Restricted access - publisher's policyEnabling timing analysis in the presence of caches has been pursued by the real-Time embedded systems (RTES) community for years due to cache's huge potential to reduce software's worst-case execution time (WCET). However, ... -
DReAM: An approach to estimate per-Task DRAM energy in multicore systems
(2016-12)
Article
Open AccessAccurate per-task energy estimation in multicore systems would allow performing per-task energy-aware task scheduling and energy-aware billing in data centers, among other applications. Per-task energy estimation is ... -
DReAM: Per-task DRAM energy metering in multicore systems
(Springer, 2014)
Conference report
Open AccessInteraction across applications in DRAM memory impacts its energy consumption. This paper makes the case for accurate per-task DRAM energy metering in multicores, which opens new paths to energy/performance optimizations, ... -
DTM: degraded test mode for fault-aware probabilistic timing analysis
(Institute of Electrical and Electronics Engineers (IEEE), 2013)
Conference report
Restricted access - publisher's policyExisting 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 ... -
Dynamically controlled resource allocation in SMT processors
(Institute of Electrical and Electronics Engineers (IEEE), 2004)
Conference report
Open AccessSMT processors increase performance by executing instructions from several threads simultaneously. These threads use the resources of the processor better by sharing them but, at the same time, threads are competing for ... -
Enabling SMT for real-time embedded systems
(Institute of Electrical and Electronics Engineers (IEEE), 2004)
Conference report
Open AccessIn order to deal with real time constraints, current embedded processors are usually simple in-order processors with no speculation capabilities to ensure that execution times of applications are predictable. However, ...
