A new generation of real-time systems in the JET tokamak

D. Alves, A.C. Neto, D.F. Valcarcel, R. Felton, J.M. Lopez, A. Barbalace, L. Boncagni, P. Card, G. De Tommasi, A. Goodyear, S. Jachmich, P.J. Lomas, F. Maviglia, P. McCullen, A. Murari, M. Rainford, C. Reux, F. Rimini, F. Sartori, A.V. StephenJ. Vega, R. Vitelli, L. Zabeo, K.-D. Zastrow

Research output: Contribution to conferencePaper

13 Citations (Scopus)

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 © 2012 IEEE.
Original languageEnglish
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2012 18th IEEE-NPSS Real Time Conference, RT 2012 - , United States
Duration: 1 Jan 2012 → …

Conference

Conference2012 18th IEEE-NPSS Real Time Conference, RT 2012
CountryUnited States
Period1/1/12 → …

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All Science Journal Classification (ASJC) codes

  • Information Systems

Cite this

Alves, D., Neto, A. C., Valcarcel, D. F., Felton, R., Lopez, J. M., Barbalace, A., ... Zastrow, K-D. (2012). A new generation of real-time systems in the JET tokamak. Paper presented at 2012 18th IEEE-NPSS Real Time Conference, RT 2012, United States. https://doi.org/10.1109/RTC.2012.6418367