Towards Seismic Wave Modeling on Heterogeneous Many-Core Architectures Using Task-Based Runtime System

• Víctor Martínez UFRGS
• David Michéa BRGM
• Fabrice Dupros BRGM
• Olivier Aumage Inria Bordeaux Sud-Ouest
• Samuel Thibault Inria Bordeaux Sud-Ouest
• Hideo Aochi BRGM
• Philippe O. A. Navaux UFRGS

Resumo

Understanding three-dimensional seismic wave propagation in complex media is still one of the main challenges of quantitative seismology. Because of its simplicity and numerical efficiency, the finite-differences method is one of the standard techniques implemented to consider the elastodynamics equation. Additionally, this class of modeling heavily relies on parallel architectures in order to tackle large scale geometries including a detailed description of the physics. Last decade, significant efforts have been devoted towards efficient implementation of the finite-differences methods on emerging architectures. These contributions have demonstrated their efficiency leading to robust industrial applications. The growing representation of heterogeneous architectures combining general purpose multicore platforms and accelerators leads to re-design current parallel application. In this paper, we consider Star PU task-based runtime system in order to harness the power of heterogeneous CPU+GPU computing nodes. We detail our implementation and compare the performance obtained with the classical CPU or GPU only versions. Preliminary results demonstrate significant speedups in comparison with the best implementation suitable for homogeneous cores.

Palavras-chave: Computer architecture, Graphics processing units, Seismic waves, Kernel, Stress, Runtime, Mathematical model, Seismic wave simulation, Task-based programming, Heterogeneous architectures, GPU