A GPU-based real time high performance computing service in a fast plant system controller prototype for ITER

► Implementation of fast plant system controller (FPSC) for ITER CODAC. ► GPU-based real time high performance computing service. ► Performance evaluation with respect to other solutions based in multi-core processors. EURATOM/CIEMAT and the Technical University of Madrid UPM are involved in the development of a FPSC (fast plant system control) prototype for ITER based on PXIe form factor. The FPSC architecture includes a GPU-based real time high performance computing service which has been integrated under EPICS (experimental physics and industrial control system). In this work we present the design of this service and its performance evaluation with respect to other solutions based in multi-core processors. Plasma pre-processing algorithms, illustrative of the type of tasks that could be required for both control and diagnostics, are used during the performance evaluation.