Extreme Scale Multi-Physics Simulations of the
Tsunamigenic 2004 Sumatra Megathrust Earthquake
SessionMultiphysics
Authors
Event Type
Paper
Applications
Effective Application of HPC
TimeTuesday, November 14th4:30pm -
5pm
Location301-302-303
DescriptionWe present a high-resolution simulation of the 2004
Sumatra-Andaman earthquake, including non-linear
frictional failure on a megathrust-splay fault system.
Our method exploits unstructured meshes capturing the
complicated geometries in subduction zones that are
crucial to understand large earthquakes and tsunami
generation. These up-to-date largest and longest dynamic
rupture simulations enable analysis of dynamic source
effects on the seafloor displacements.
To tackle the extreme size of this scenario an end-to-end optimization of the simulation code SeisSol was necessary. We implemented a new cache-aware wave propagation scheme and optimized the dynamic rupture kernels using code generation. We established a novel clustered local-time-stepping scheme for dynamic rupture. In total, we achieved a speed-up of 13.6 compared to the previous implementation. For the Sumatra scenario with 221 million elements this reduced the time-to-solution to 13.9 hours on 86,016 Haswell cores. Furthermore, we used asynchronous output to overlap I/O and compute time.
To tackle the extreme size of this scenario an end-to-end optimization of the simulation code SeisSol was necessary. We implemented a new cache-aware wave propagation scheme and optimized the dynamic rupture kernels using code generation. We established a novel clustered local-time-stepping scheme for dynamic rupture. In total, we achieved a speed-up of 13.6 compared to the previous implementation. For the Sumatra scenario with 221 million elements this reduced the time-to-solution to 13.9 hours on 86,016 Haswell cores. Furthermore, we used asynchronous output to overlap I/O and compute time.
Download PDF:
here
Authors
