The coupled neutron and photon transport Monte Carlo code MCNP (version 3B) has been realized the parallelization in PVM and MPI by modifying serial code. The results of sample problems prove the correction of code. The speedup increases linearly and the efficiencies are up to 98.5% relate to parallel code and up to 95.7% relate to serial code for 12-processor, respectively.
The Monte Carlo method is used to simulate unsteady-state particle transport calculations. Due to the computational time existing obviously difference among the different steps and I/O percentage is rated high, it results in the parallel com-putation efficiency down if the fix processors are used in each step. So parallel I/O and the adaptive parallel algorithms are developed. The good results and high speedup are obtained.
