航空瞬变电磁中MPI并行计算分析

MPI parallel computing in airborne transient electromagnetic method

由于航空瞬变电磁的数据量很大,外加瞬变电磁反演方法耗时较大地电磁更多,为了在后期资料处理时减少不必要的耗时,对正演计算中的频时转换的方法做了一定研究,采用基于拉普拉斯尺度变换性质的Gaver-Stehfest变换做频时转换,适当减少了编写程序代码的行数及程序计算的时间消耗。针对现在的计算机很多都是多核的特点,研究了航空瞬变电磁一维反演的MPI(Message Passing Interface)并行计算,大大地节约了运算时间,分析了并行计算时不同的多核CPU和不同的进程数时的加速比及并行效率。

Becasue airborne transient electromagnetic data volume is huge and transient electromagnetic inversion method is more compared with the magnetotelluric time -consuming. It is necessary to apply parallel computing of the research on air-borne transient electromagnetic to reduce the unnecessary time in data processing. With the advantages of most computers with multi-cores, parallel computing research can be easily used in airborne transient electromagnetic. We first analyzed the fre-quency-time conversion method in the forward calculation,using Gaver - Stehfest transform based on Laplace scale transform nature do frequency -time conversion. This appropriates to reduce the number of rows to write program code and program cal-culation of time consumption. And then studied airborne transient electromagnetic one dimensional inversion of MPI （Message Passing Interface） with parallel omputing, which greatly saves the operation time. The parallel computing is then analyzed with multicore cpus,different processes considering the speedup ratio and parallel efficiency.