10 documents found, page 1 of 1
High-performance parallelisation of real-time applications
Pinho, Luís Miguel; Nelis, Vincent; Quinoñes, Eduardo; Burgio, Paolo; Marongiu, Andrea; Gai, Paolo; Sancho, JuanThis paper presents an overview of the P-SOCRATES methodology and tools, instantiated in the UpScale SDK (Software Development Kit) for the development of time-predictable high-performance applications. The proposed methodology was designed to provide an integrated SDK to fully exploit the huge performance opportunities brought by the most advanced many-core processors, whilst ensuring a predictable performance...
An extensible framework for multicore response time analysis
David, Robert I.; Altmeyer, Sebastian; Indrusiak, Leandro S.; Maiza, Claire; Nelis, Vincent; Reineke, JanIn this paper, we introduce a multicore response time analysis (MRTA) framework, which decouples response time analysis from a reliance on context-independent WCET values. Instead, the analysis formulates response times directly from the demands placed on different hardware resources. The MRTA framework is extensible to different multicore architectures, with a variety of arbitration policies for the common int...
The variability of application execution times on a multi-core platform
Nelis, Vincent; Yomsi, Patrick; Pinho, Luís MiguelIt is a known fact that processes running concurrently on different cores in a multicore environment interfere with each other on the processor shared resources. The contention on these shared resources considerably slows down the execution on every core since sometimes the cores must stall while their requests to access the resources are being served. But by how much the execution may b e s lowed down due to t...
Contention-Free Execution of Automotive Applications on a Clustered Many-Core P...
Becker, Matthias; Dasari, Dakshina; Nikolic, Borislav; Åkesson, Benny; Nelis, Vincent; Nolte, ThomasNext generations of compute-intensive real-time applications in automotive systems will require more powerful computing platforms. One promising power-efficient solution for such applications is to use clustered many-core architectures. However, ensuring that real-time requirements are satisfied in the presence of contention in shared resources, such as memories, remains an open issue. This work presents a nove...
A framework for memory contention analysis in multi-core platforms
Dasari, Dakshina; Nelis, Vincent; Akesson, BennyThe last decade has witnessed a major shift towards the deployment of embedded applications on multi-core platforms. However, real-time applications have not been able to fully benefit from this transition, as the computational gains offered by multi-cores are often offset by performance degradation due to shared resources, such as main memory. To efficiently use multi-core platforms for real-time systems, it i...
Response Time Analysis of Sporadic DAG Tasks under Partitioned Scheduling
Fonseca, José; Nelissen, Geoffrey; Nelis, Vincent; Pinho, Luís MiguelSeveral schedulability analyses have been proposed for a variety of parallel task systems with real-time constraints. However, these analyses are mostly restricted to global scheduling policies. The problem with global scheduling is that it adds uncertainty to the lower-level timing analysis which on multicore systems are heavily context-dependent. As parallel tasks typically exhibit intense communication and c...
Investigation on AUTOSAR-Compliant Solutions for Many-Core Architectures
Becker, Matthias; Dasari, Dakshina; Nelis, Vincent; Behnam, Moris; Pinho, Luís Miguel; Nolte, ThomasAs of today, AUTOSAR is the de facto standard in the automotive industry, providing a common software architec- ture and development process for automotive applications. While this standard is originally written for singlecore operated Elec- tronic Control Units (ECU), new guidelines and recommendations have been added recently to provide support for multicore archi- tectures. This update came as a response to ...
Using Quicktrace to collect runtime execution traces easily and automatically
Nelis, Vincent; Pinho, Luís MiguelIn many application domains, it is an elementary step in the design of a software, typically before its deployment, to exercise parts of its functionality by running some of its code on the target platform and collect informations about its runtime behaviour. Those informations may be used for debugging purpose or to assess the responsiveness of the application for example.
Global and Partitioned Multiprocessor Fixed Priority Scheduling with Deferred P...
Davis, Robert I.; Burns, Alan; Marinho, José; Nelis, Vincent; Petters, Stefan M.; Bertogna, MarkoThis article introduces schedulability analysis for global fixed priority scheduling with deferred preemption (gFPDS) for homogeneous multiprocessor systems. gFPDS is a superset of global fixed priority pre-emptive scheduling (gFPPS) and global fixed priority non-pre-emptive scheduling (gFPNS). We show how schedulability can be improved using gFPDS via appropriate choice of priority assignment and final non-pre...
NoC contention analysis using a branch-and-prune algorithm
Dasari, Dakshina; Nikolic, Borislav; Nelis, Vincent; Petters, Stefan M.“Many-core” systems based on a Network-on-Chip (NoC) architecture offer various opportunities in terms of performance and computing capabilities, but at the same time they pose many challenges for the deployment of real-time systems, which must fulfill specific timing requirements at runtime. It is therefore essential to identify, at design time, the parameters that have an impact on the execution time of the t...