Over the last few years, real-time simulation has captured more and more interest due to the raised demand for testing hardware in the real world. Such a system allows us to operate the software model copied from the physical system at the rate of the natural world to reproduce the behaviour of the hardware counterpart in the real world. In addition, the simulation systems can run with discrete, constant time steps within the range of several $mu s$. The real-time simulation has different time constraints depending on the application method or requirements of the target. Several innovative multiprocessor architectures have been designed and innovated to achieve this goal.