Based on the Message-Passing Interface (MPI) programming environment, the three-dimensional parallel operation of the finite-difference time-domain method (FDTD) is discussed with PML (Perfectly Matched Layer) as the absorbing boundary condition. Through certain numerical calculations, the relationship between the number of grids, the number of processes, and the partitioning method in the FDTD parallel algorithm under MPI and their impact on the computational efficiency are quantitatively given.
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