Ramesh Pankajakshan
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View article: Regional-scale fault-to-structure earthquake simulations with the EQSIM framework: Workflow maturation and computational performance on GPU-accelerated exascale platforms
Regional-scale fault-to-structure earthquake simulations with the EQSIM framework: Workflow maturation and computational performance on GPU-accelerated exascale platforms Open
Continuous advancements in scientific and engineering understanding of earthquake phenomena, combined with the associated development of representative physics-based models, is providing a foundation for high-performance, fault-to-structur…
View article: Transformational Regional-Scale Earthquake Simulations with the DOE EarthQuake SIMulation Exascale Framework
Transformational Regional-Scale Earthquake Simulations with the DOE EarthQuake SIMulation Exascale Framework Open
Earthquakes present worldwide risk to economic and human safety. The 2023 earthquakes in Turkiye provided a reminder of the potential for catastrophic consequences with 50,700 deaths and 15.7 million people affected. The ability to predict…
View article: Level-2 Milestone 8551: Development Environment for El Capitan
Level-2 Milestone 8551: Development Environment for El Capitan Open
This report describes the ASC L2 Milestone #8551 "Development Environment for El Capitan" which documents the deployment and use of the development environment for the El Capitan Early Access Systems (EAS-3).
View article: SW4 Curvilinear Kernels
SW4 Curvilinear Kernels Open
Five computationally expensive stencil evaluation routines from SW4(https://github.com/geodynamics/sw4 GPL license) have been extracted and packaged with a driver to create a mini-app for evaluating compiler and GPU performance. The kernel…
View article: Regional-Scale 3D Ground-Motion Simulations of Mw 7 Earthquakes on the Hayward Fault, Northern California Resolving Frequencies 0–10 Hz and Including Site-Response Corrections
Regional-Scale 3D Ground-Motion Simulations of Mw 7 Earthquakes on the Hayward Fault, Northern California Resolving Frequencies 0–10 Hz and Including Site-Response Corrections Open
Large earthquake ground-motion simulations in 3D Earth models provide constraints on site-specific shaking intensities but have suffered from limited frequency resolution and ignored site response in soft soils. We report new regional-scal…
View article: Sierra Center of Excellence: Lessons learned
Sierra Center of Excellence: Lessons learned Open
The introduction of heterogeneous computing via GPUs from the Sierra architecture represented a significant shift in direction for computational science at Lawrence Livermore National Laboratory (LLNL), and therefore required significant p…
View article: Porting a 3D seismic modeling code (SW4) to CORAL machines
Porting a 3D seismic modeling code (SW4) to CORAL machines Open
Seismic waves fourth order (SW4) solves the seismic wave equations on Cartesian and curvilinear grids using large compute clusters with O (100,000) cores. In this article we discuss the porting of SW4 to run on the CORAL architecture using…
View article: Umpire: Application-focused management and coordination of complex hierarchical memory
Umpire: Application-focused management and coordination of complex hierarchical memory Open
Advanced architectures like Sierra provide a wide range of memory resources that must often be carefully controlled by the user. These resources have varying capacities, access timing rules, and visibility to different compute resources. A…
View article: Preparation and optimization of a diverse workload for a large-scale heterogeneous system
Preparation and optimization of a diverse workload for a large-scale heterogeneous system Open
Productivity from day one on supercomputers that leverage new technologies requires significant preparation. An institution that procures a novel system architecture often lacks sufficient institutional knowledge and skills to prepare for …
View article: An evaluation of the CORAL interconnects
An evaluation of the CORAL interconnects Open
The US Department of Energy deployed the Summit and Sierra supercomputers with the latest state-of-the-art network interconnect technology in 2018 and both systems entered production in 2019. In this paper, we provide an in-depth assessmen…
View article: The Design, Deployment, and Evaluation of the CORAL Pre-Exascale Systems
The Design, Deployment, and Evaluation of the CORAL Pre-Exascale Systems Open
CORAL, the Collaboration of Oak Ridge, Argonne and Livermore, is fielding two similar IBM systems, Summit and Sierra, with NVIDIA GPUs that will replace the existing Titan and Sequoia systems. Summit and Sierra are currently ranked No. 1 a…
View article: Level-2 Milestone 6459: Sierra Applications Development Environment
Level-2 Milestone 6459: Sierra Applications Development Environment Open
This report documents the deployment of the applications development environment for the CORAL Sierra Initial Delivery system, which consisted of the first one-quarter of the full Sierra hardware.
View article: Sierra Advances Resolution of Hayward Fault Earthquake Simulations
Sierra Advances Resolution of Hayward Fault Earthquake Simulations Open
The character of strong earthquake shaking within a few kilometers of a fault is highly variable and poorly constrained by relatively few empirical recordings. Supercomputers enable simulation of earthquake motions to investigate the hazar…