High-Frequency Nonlinear Earthquake Simulations on Petascale Heterogeneous Supercomputers
SessionAccelerating Science
Session ChairMichael Bader
Event Type
Paper
Applications
Effective Application of HPC
Heterogeneous Systems
Intermediate
Performance
Scientific Computing
TimeThursday, November 17th3:30pm - 4pm
Location255-EF
DescriptionThe omission of nonlinear effects in large-scale 3D ground motion estimation, which are particularly challenging due to memory and scalability issues, can result in costly misguidance for structural design in earthquake-prone regions. We have implemented nonlinearity using a Drucker-Prager yield condition in AWP-ODC and further optimized the CUDA kernels to more efficiently utilize the GPU's memory bandwidth. The application has resulted in a significant increase in the model region and accuracy for state-of-the-art earthquake simulations in a realistic Earth structure, which are now able to resolve the wavefield at frequencies relevant for the most vulnerable buildings (> 1 Hz) while maintaining the scalability and efficiency of the method. We successfully ran the code on 4,200 Kepler K20X GPUs on NCSA Blue Waters and OLCF Titan to simulate a M 7.7 earthquake on the southern San Andreas fault with a spatial resolution of 25 m for frequencies up to 4 Hz.
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Paper provided by the IEEE Computer SocietyPaper also available from the ACM Digital Library
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