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Title: High Performance Radiation Transport Simulations on TITAN

Abstract

In this paper we describe the Denovo code system. Denovo solves the six-dimensional, steady-state, 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 inverting the transport operator, 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 performance of Denovo on the 10--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 sequential computations. Numerical results demonstrating Denovo performance on early Titan hardware are presented.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1156704
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: Supercomputing SC12, Salt Lake City, NV, USA, 20121112, 20121115
Country of Publication:
United States
Language:
English

Citation Formats

Baker, Christopher G, Davidson, Gregory G, Evans, Thomas M, Hamilton, Steven P, Jarrell, Joshua J, and Joubert, Wayne. High Performance Radiation Transport Simulations on TITAN. United States: N. p., 2012. Web.
Baker, Christopher G, Davidson, Gregory G, Evans, Thomas M, Hamilton, Steven P, Jarrell, Joshua J, & Joubert, Wayne. High Performance Radiation Transport Simulations on TITAN. United States.
Baker, Christopher G, Davidson, Gregory G, Evans, Thomas M, Hamilton, Steven P, Jarrell, Joshua J, and Joubert, Wayne. Sun . "High Performance Radiation Transport Simulations on TITAN". United States.
@article{osti_1156704,
title = {High Performance Radiation Transport Simulations on TITAN},
author = {Baker, Christopher G and Davidson, Gregory G and Evans, Thomas M and Hamilton, Steven P and Jarrell, Joshua J and Joubert, Wayne},
abstractNote = {In this paper we describe the Denovo code system. Denovo solves the six-dimensional, steady-state, 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 inverting the transport operator, 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 performance of Denovo on the 10--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 sequential computations. Numerical results demonstrating Denovo performance on early Titan hardware are presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {1}
}

Conference:
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