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Barbalace, A.

Paper Title Page
TPPA21 MDSplus Real-Time Data Access in RTAI 132
  • A. Barbalace, A. Luchetta, C. Taliercio, G. Manduchi
    Consorzio RFX, Euratom ENEA Association, Padova
  • T. W. Fredian
    MIT, Cambridge, Massachusetts
  • J. A. Stillerman
    MIT/PSFC, Cambridge, Massachusetts
  The MDSplus package is widely used in Nuclear Fusion research for data acquisition and management. Recent extensions of the system provide useful features for real-time applications, such as the possibility of locking selected data items in memory and real-time notification. The real-time extensions of MDSplus have been implemented as a set of C++ classes and can be easily ported to any target architecture by developing a few adapter classes. The real-time data access layer of MDSplus is currently available for Windows, Linux, VxWorks and RTAI. In particular, the RTAI platform is very promising in this context because it allows the co-existence of offline, non-real-time tasks with real-time ones. It is hence possible to devise an architecture where real-time functionality is handled by a few selected tasks using the real-time data access layer of MDSplus, whereas background, non-real-time activity is carried out by “traditional” Linux tasks. This organization may be of interest for the next generation of fusion devices with long-duration discharges, during which the system has to provide feedback control in real time and to sustain continuous data acquisition and storage.