Fast multi-core co-simulation of Cyber-Physical Systems : application to internal combustion engines

Abir Ben Khaled 1 Mohamed El Mongi Ben Gaïd 1 Nicolas Pernet 1 Daniel Simon 2, 3
1 IFPEN - IFP Energies nouvelles
2 DEMAR - Artificial movement and gait restoration
LIRMM - Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier, CRISAM - Inria Sophia Antipolis - Méditerranée
3 LIRMM - Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier
Abstract : The design process of complex Cyber-Physical Systems often relies on co-simulations of the system, involving the interaction of several simulated models of sub-systems. However, reaching real-time simulations is currently prevented by prohibitive CPU times using the single-threaded existing simulation tools. This paper investigates the problem of the e cient parallel co-simulation of hybrid dynamical systems. It introduces a finely-grained co-simulation method enabling numerical integration speed-ups. It is obtained using a partition across the model into loosely coupled sub-systems with sparse communication between modules. The proposed scheme leads to schedule a large number of operations with a wide range of execution times. A suitable o -line scheduling algorithm, based on the input/output dynamics of the models, is proposed to minimize the simulation errors induced by the parallel execution. This scheme is finally tested using the phenomenological model of a combustion engine issued from the Functional Mockup Interface framework. Compared with the sequential case, it shows significant speed-ups while keeping the numerical integration accuracy under control.
Keywords : Hybrid dynamical system Distributed simulation Cyber-Physical System Numerical integration Model decomposition Multi-core scheduling
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Abir Ben Khaled, Mohamed El Mongi Ben Gaïd, Nicolas Pernet, Daniel Simon. Fast multi-core co-simulation of Cyber-Physical Systems : application to internal combustion engines. Simulation Modelling Practice and Theory, Elsevier, 2014, 47 (September), pp.79-91. ⟨10.1016/j.simpat.2014.05.002⟩. ⟨hal-01018348v2⟩

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