SCHEDULE: NOV 10-16, 2012
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High Performance Radiation Transport Simulations - Preparing for TITAN
SESSION: Massively Parallel Simulations
EVENT TYPE: Papers
TIME: 11:30AM - 12:00PM
SESSION CHAIR: Kamesh Madduri
AUTHOR(S):Christopher Baker, Gregory Davidson, Thomas Evans, Steven Hamilton, Joshua Jarrell, Wayne Joubert
In this paper we describe the Denovo code system. Denovo solves the seven-dimensional linear Boltzmann transport equation, of central importance to nuclear technology applications such as reactor core analysis (neutronics), radiation shielding, nuclear forensics and radiation detection. The code features multiple spatial differencing schemes, state-of-the-art linear solvers, the Koch-Baker-Alcouffe (KBA) parallel wavefront sweep algorithm for modeling radiation flux, a new multilevel energy decomposition method scaling to hundreds of thousands of processing cores, and a modern, novel code architecture that supports straightforward integration of new features. In this paper we discuss the port of Denovo to the 20+ petaflop ORNL GPU-based system, Titan. We describe algorithms and techniques used to exploit the capabilities of Titan's heterogeneous compute node architecture and the challenges of obtaining good parallel performance for this sparse hyperbolic PDE solver containing inherently recursive computations. Numerical results demonstrating Denovo performance on representative early hardware are presented.
Kamesh Madduri (Chair) - Pennsylvania State University
Christopher Baker - Oak Ridge National Laboratory
Gregory Davidson - Oak Ridge National Laboratory
Thomas Evans - Oak Ridge National Laboratory
Steven Hamilton - Oak Ridge National Laboratory
Joshua Jarrell - Oak Ridge National Laboratory
Wayne Joubert - Oak Ridge National Laboratory