In this paper we discribe a nuew approach for the simulation of discrete-event systems on massively parrallel computers. In spite of considerable partial puralilesm that exist in discrete-event system in intrinsically difficult. We propose to simulate several such systems simultaneously and in parallel. These are variants of a "nominal system" with different system parameter values of operating policies. We uses a single clock mechanism that drives all the variants in parallel, synchronizes their trajectories and is the basis of our SIMD implementation. Widescrive a implementation on the SIMD MsPar MP-1 computer and we address the computational issues related to our approach in this context.