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.
描述了模拟双源距中子孔隙度测井工具响应的一种 MC 方法。在这个专用 MC 程序中,使用了几种有效方差降低技巧,如:隐吸收、权截断、能量截断、几何分裂和赌、方向偏倚等。针对这种核测井工具,将这些技巧作些改进;通过在程序中分别加上这几种方差降低技巧,对各自运行结果、精度、计算时间的分析和讨论,指出这些技巧的优缺点,亦证明了这些技巧确实有效;同时在某种程度上将此专用程序与通用程序做了比较。
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.
