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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Alves, D. Neto, A.C. Valcarcel, D.F. Felton, R. Lopez, J.M. Barbalace, A. Boncagni, L. Card, P. De Tommasi, G. Goodyear, A. Jachmich, S. Lomas, P.J. Maviglia, F. McCullen, P. Murari, A. Rainford, M. Reux, C. Rimini, F. Sartori, F. Stephen, A.V. Vega, J. Vitelli, R. Zabeo, L. Zastrow, K.-D. |
| Copyright Year | 2012 |
| Description | Author affiliation: EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB (Felton, R.; Card, P.; Goodyear, A.; Lomas, P.J.; McCullen, P.; Rainford, M.; Rimini, F.; Stephen, A.V.; Zastrow, K.-D.) || Ecole Polytechnique, LPP, CNRS UMR 7648, 91128 Palaiseau, France (Reux, C.) || CAEND.Universidad Politcnica de Madrid, Spain (Lopez, J.M.) || TER, St. Paul-Lez-Durance 13108, France (Zabeo, L.) || Fusion for Energy, 08019 Barcelona, Spain (Sartori, F.) || Dipartimento di Informatica, Sistemi e Produzione, Università di Roma Tor Vergata 00133 Rome, Italy (Vitelli, R.) || Associazione EURATOM-ENEA sulla Fusione, Consorzio RFX, Padova, Italy (Barbalace, A.; Murari, A.) || Associação Euratom/IST, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001, Portugal (Alves, D.; Neto, A.C.; Valcarcel, D.F.) || Laboratorio Nacional de Fusion, Asociacion EURATOMCIEMAT, Madrid, Spain (Vega, J.) || Associazione EURATOMENEA-CREATE, Univ. di Napoli Federico II, Via Claudio 21, 80125, Italy (De Tommasi, G.; Maviglia, F.) || Associazione EURATOM/ENEA, 00040 Frascati, Italy (Boncagni, L.) || Laboratory for Plasma Physics, Ecole Royale Militaire/Koninklijke Militaire School, EURATOM-Association Belgian State, Brussels, Belgium (Jachmich, S.) |
| Abstract | Recently a new recipe for developing and deploying real-time systems has become increasingly adopted in the JET tokamak. Powered by the advent of x86 multi-core technology and the reliability of the JET's well established Real-Time Data Network (RTDN) to handle all real-time I/O, an official Linux vanilla kernel has been demonstrated to be able to provide real-time performance to user-space applications that are required to meet stringent timing constraints. In particular, a careful rearrangement of the Interrupt ReQuests' (IRQs) affinities together with the kernel's CPU isolation mechanism allows to obtain either soft or hard real-time behavior depending on the synchronization mechanism adopted. Finally, the Multithreaded Application Real-Time executor (MARTe) framework is used for building applications particularly optimised for exploring multi-core architectures. In the past year, four new systems based on this philosophy have been installed and are now part of the JET's routine operation. The focus of the present work is on the configuration and interconnection of the ingredients that enable these new systems' real-time capability and on the impact that JET's distributed real-time architecture has on system engineering requirements, such as algorithm testing and plant commissioning. Details are given about the common real-time configuration and development path of these systems, followed by a brief description of each system together with results regarding their real-time performance. A cycle time jitter analysis of a user-space MARTe based application synchronising over a network is also presented. The goal is to compare its deterministic performance while running on a vanilla and on a Messaging Real time Grid (MRG) Linux kernel |
| Starting Page | 1 |
| Ending Page | 9 |
| File Size | 873491 |
| Page Count | 9 |
| File Format | |
| ISBN | 9781467310826 |
| e-ISBN | 9781467310840 |
| DOI | 10.1109/RTC.2012.6418367 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2012-06-09 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Real-time systems Linux Kernel Jitter Plasmas Switches Stress Nuclear Fusion Real-Time |
| Content Type | Text |
| Resource Type | Article |
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