I have finished building the transfer function model of mechanic systems in MATLAB.  But now if I am going to write the model in C language, what could I do? Any hints, fire are welcome!

Has someone worked on the parallel computing in the multibody system to the vehicle dynamics? It's what I am doing now. I am faced to make a choice, OpenMP or MPI? OpenMP is a little  easy to program, but with less portability. I prefer MPI and I think if it is a best choice to parallelize the constraint libraries, although it is a bit difficult to program. Am I right? Is anyone  also doing it now? Opinions and suggestions are welcome!

                            Xianfeng Ye