Realizing Joint Extreme-Scale Simulations on Multiple Supercomputers-Two Superfacility Case Studies

High-dimensional grid-based simulations serve as both a tool and a challenge in researching various domains. The main challenge of these approaches is the well-known curse of dimensionality, amplified by the need for fine resolutions in high-fidelity applications. The combination technique (CT) prov...

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Bibliographic Details
Published in:SC24: International Conference for High Performance Computing, Networking, Storage and Analysis pp. 1 - 17
Main Authors: Pollinger, Theresa, Craen, Alexander Van, Offenhauser, Philipp, Pfluger, Dirk
Format: Conference Proceeding
Language:English
Published: IEEE 17.11.2024
Subjects:
Analytical models
Bandwidth
combination technique
Computational modeling
coupling HPC systems
Couplings
file transfer
Hardware
High performance computing
higher-dimensional simulation
large scale
Load management
Load modeling
Memory management
multi-level methods
Optimization
plasma turbulence
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Summary:High-dimensional grid-based simulations serve as both a tool and a challenge in researching various domains. The main challenge of these approaches is the well-known curse of dimensionality, amplified by the need for fine resolutions in high-fidelity applications. The combination technique (CT) provides a straightforward way of performing such simulations while alleviating the curse of dimensionality. Recent work demonstrated the potential of the CT to join multiple systems simultaneously to perform a single high-dimensional simulation. This paper shows how to extend this to three or more systems and addresses some remaining challenges: load balancing on heterogeneous hardware; utilizing compression to maximize the communication bandwidth; efficient I/O management through hardware mapping; and improving memory utilization through algorithmic optimizations. Combining these contributions, we demonstrate the feasibility of the CT for extreme-scale Superfacility scenarios of 46 trillion DOF on two systems and 35 trillion DOF on three systems. Scenarios at these resolutions would be intractable with full-grid solvers (\gt1,000 nonillion DOF each).
DOI:10.1109/SC41406.2024.00104