MT Occam并行反演方案及性能分析

Parallel MT Occam Inversion Scheme and Its Performance Analysis

针对MT Occam反演速度慢的问题,分析了实现其并行计算的可行性和途径,提出了基于频点和拉格朗日乘子(μ-1)扫描点划分的大粒度并行反演方案和具体实现步骤。对方案的加速性能进行了理论分析,得出了理论加速比曲线,明确了方案的适用性。采用基于消息传递的PVM并行平台,以主-从编程模式,实现了偏导数矩阵和μ值求取的并行计算。算例表明,综合并行效率较高,反演速度提高显著。

This paper analyzed the feasibility and ways for parallel implementation of the MT（magneto telluric） Occam inversion in order to increase the inversion speed. A coarse-grained parallel inversion scheme based on frequency point and Lagrange multiplier （μ^1） scanning point division was proposed and a concrete parallel procedure was put forward. Theoretical performance of the scheme was analyzed and the speed-up curve obtained, and the applicability of the scheme was clarified. Parallel computations for the partial derivative matrix and the μ seeking were realized by using the master-slave programming model under the message-passing PVM parallel platform. The experiment result indicated that the all-around parallel efficiency was ideal and the inversion speed increased obviously.