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Supercomputer simulations of structure formation in the Universe

  • Tomoaki Ishiyama (a1)

Abstract

We describe the implementation and performance results of our massively parallel MPI/OpenMP hybrid TreePM code for large-scale cosmological N-body simulations. For domain decomposition, a recursive multi-section algorithm is used and the size of domains are automatically set so that the total calculation time is the same for all processes. We developed a highly-tuned gravity kernel for short-range forces, and a novel communication algorithm for long-range forces. For two trillion particles benchmark simulation, the average performance on the fullsystem of K computer (82,944 nodes, the total number of core is 663,552) is 5.8 Pflops, which corresponds to 55% of the peak speed.

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Supercomputer simulations of structure formation in the Universe

  • Tomoaki Ishiyama (a1)

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