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Wednesday, March 4 • 16:05 - 16:25
Coarse-grained Seismic Algorithms: 'Portable Task-based Programming for Elastodynamics,” Lionel Boillot, INRIA Magique3D team; George Bosilca, Innovative Computing Laboratory - University of Tennessee; Emmanuel Agullo, INRIA Hiepacs team; Henri Calandra,

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Most of the seismic imaging techniques are based on wave propagation simulations. 3D anisotropic elastodynamics is a generally accepted accurate candidate for the modeling of the subsurface. A Discontinuous Galerkin space discretization, associated with a Leap-Frog time scheme, leads to a quasi-explicit matrix linear system involving only local computations (i.e. cell by cell) at every half-timestep. The original, message passing parallel implementation uses a domain decomposition with one domain per process, and lead to a uneven work balance between processes. As a result, the optimization for each architecture is time consuming and the solution is never portable. In a previous work, we successfully overcame this problem on shared memory architectures (ccNUMA node and Intel Xeon Phi accelerator) by changing the programming paradigm with a task-based approach and the use of the PaRSEC runtime system. The two key-features for efficient task scheduling are finer granularity than one subdomain per core and work-stealing depending on data locality. The results showed very good parallel efficiency and were portable on these machines. We now plan to address distributed memory architectures in order to target clusters of hybrid multicore nodes and coprocessors.

Speakers
avatar for Lionel Boillot

Lionel Boillot

Expert Engineer, Inria
avatar for Henri Calandra

Henri Calandra

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Henri Calandra obtained his M.Sc. in mathematics in 1984 and a Ph.D. in mathematics in 1987 from the Universite des Pays de l’Adour in Pau, France. He joined Cray Research France in 1987 and worked on seismic applications. In 1989 he joined the applied mathematics department of... Read More →


Wednesday March 4, 2015 16:05 - 16:25 CST
BioScience Research Collaborative 6500 Main Street, Houston, Tx 77005

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