FMI-based distributed multi-simulation with DACCOSIM

Our research project aims at enabling multi-simulation based on the FMI 2.0 standard and the cooperation of multiple FMUs (FMI simulation units). In order to support large scale multi-simulations, our solution (DACCOSIM) runs on multi-core and distributed architectures. To support variable step size, the necessary error control and rollbacks are achieved through a hierarchical and distributed control architecture. At each step, simulation data communications also occur, but directly between FMU pairs in a fully decentralized fashion. Moreover, DACCOSIM implements an algorithm to perform the complex initialization of the various components of the multi-simulation. DACCOSIM comes as a graphical framework to easily design a multi-simulation and to automatically generate associated code, and as a multithreaded and distributed library to execute it. We evaluated DACCOSIM on an industrial use case provided by EDF (leading French utility company), run on multi-core PCs and PC clusters. Preliminary performance measurements on a 4-physical-core PC exhibit a speedup compared to monothreaded Dymola execution using the same FMUs. On multi-core PC clusters we face overhead communication times due to frequent small communications but this distribution allows to process large co-simulations.

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