99. A Fast Implicit Solver with Low Memory Footprint and High Scalability for Comprehensive Earthquake Simulation System
Event Type
Poster
TimeTuesday, November 15th8:30am - 5pm
LocationLower Lobby Concourse
DescriptionWe developed a comprehensive earthquake simulation system that improves the reliability of conventional earthquake disaster estimates by significant speedup of unstructured implicit finite-element simulations needed to solve nonlinear wave-propagation problems in complex-shaped domains. A fast implicit solver with a low-memory footprint was developed using an algorithm combining a multi-grid, mixed-precision, communication avoiding inexact LU preconditioning, and element-by-element method with novel SIMD-buffering and multi-core coloring methods. Using this solver with 88.8% size-up scalability up to 663,552 CPU cores of the full K computer, a challenging practical 2.05 Tera degrees-of-freedom problem (205 times more degrees-of-freedom compared to the current state-of-the-art) was solved 30 times faster compared with a memory-efficient SC14 solver. This poster presents the algorithmic design, implementation, performance, and portability of this fast and memory-efficient implicit solver.
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