ISEP – CISTER – Comunicações em eventos científicos
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Browsing ISEP – CISTER – Comunicações em eventos científicos by Subject "Ada"
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- Constraints on the Use of Executors in Real-time SystemsPublication . Michell, Stephen; Moore, Brad; Pinho, Luís Miguel; Taft, S. TuckerPrevious work proposed work to include parallelism in Ada to improve the use of multicore processors. This work proposed a model of Tasklets to carry the expressions of parallelism, and introduced the notion of executors to map the execution of Tasklets on hardware. In developing the model, a number of choices arise that effect how well the model will accommodate real-time systems. These choices become constraints which are examined and reasonable choices proposed for adoption in Ada.
- Converging safety and high-performance domains: Integrating OpenMP into AdaPublication . Royuela, Sara; Pinho, Luís Miguel; Quiñones, EduardoThe use of parallel heterogeneous embedded architectures is needed to implement the level of performance required in advanced safety-critical systems. Hence, there is a demand for using high level parallel programming models capable of efficiently exploiting the performance opportunities. In this paper, we evaluate the incorporation of OpenMP, a parallel programming model used in HPC, into Ada, a language spread in safety-critical domains. We demonstrate that the execution model of OpenMP is compatible with the recently proposed Ada tasklet model, meant to exploit fine-grain structured parallelism. Moreover, we show the compatibility of the OpenMP and tasklet models, enabling the use of OpenMP directives in Ada to further exploit unstructured parallelism and heterogeneous computation. Finally, we state the safety properties of OpenMP and analyze the interoperability between the OpenMP and Ada runtimes. Overall, we conclude that OpenMP can be effectively incorporated into Ada without jeopardizing its safety properties.
- A Novel Run-Time Monitoring Architecture for Safe and Efficient Inline MonitoringPublication . Nelissen, Geoffrey; Pereira, David; Pinho, Luís MiguelVerification and testing are two of the most costly and time consuming steps during the development of safety critical systems. The advent of complex and sometimes partially unpredictable computing architectures such as multicore commercial-of-the-shelf platforms, together with the composable development approach adopted in multiple industrial domains such as avionics and automotive, rendered the exhaustive testing of all situations that could potentially be encountered by the system once deployed on the field nearly impossible. Run-time verification (RV) is a promising solution to help accelerate the development of safety critical applications whilst maintaining the high degree of reliability required by such systems. RV adds monitors in the application, which check at run-time if the system is behaving according to predefined specifications. In case of deviations from the specifications during the runtime, safeguarding measures can be triggered in order to keep the system and its environment in a safe state, as well as potentially attempting to recover from the fault that caused the misbehaviour. Most of the state-of-the-art on RV essentially focused on the monitor generation, concentrating on the expressiveness of the specification language and its translation in correct-by-construction monitors. Few of them addressed the problem of designing an efficient and safe run-time monitoring (RM) architecture. Yet, RM is a key component for RV. The RM layer gathers information from the monitored application and transmits it to the monitors. Therefore, without an efficient and safe RM architecture, the whole RV system becomes useless, as its inputs and hence by extension its outputs cannot be trusted. In this paper, we discuss the design of a novel RM architecture suited to safety critical applications.
- Real-Time Support in the Proposal for Fine-Grained Parallelism in AdaPublication . Miguel Pinho, Luis; Moore, BradThe Ada language has for long provided support for the development of reliable real-time systems, with a model of computation amenable for real-time analysis. To complement the already existent multiprocessor support in the language, an ongoing effort is underway to extend Ada with a fine-grained parallel programming model also suitable for realtime systems. This paper overviews the model which is being proposed, pointing out the main issues still open and road ahead.