2. 5 dimension electromagnetic forward parallel computing based on MPI + OpenMP
Bai Hongtao1,3,4, Fan Cuisong2, Li Ang4,5, He Lili4,5, Li Tonglin1
1. College of Earth Survey Science and Technology, Jilin University, Changchun, Jilin 130026, China;
2. Tianjin Center, China Geological Survey, Tianjin 300170, China;
3. Center for Computer Fundamental Education, Jilin University, Changchun, Jilin 130012, China;
4. Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, Jilin University, Changchun, Jilin 130012, China;
5. College of Computer Science and Technology, Jilin University, Changchun, Jilin 130012, China
Abstract：We propose in this paper a complex resistivity 2. 5-Dimension electromagnetic forward parallel computing algorithm based on MPI + OpenMP to improve low efficiency of large-scale numerical computation in geophysical exploration. This hybrid algorithm puts different wave domains to nodes of computer clusters using MPI. In the algorithm interior, the computation of sparse linear equations with the incomplete Cholesky biconjugate gradient (ICBCG) method is parallized on OpenMP. All waves are assigned to the nodes with an equal interval to have load balance. And to reduce communication overhead, each node reads its own model parameters. Different experiments demonstrate that our parallel algorithm can not only acquire the same data accuracy as that of serial computation methods, but also gain a near-linear speed up.
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