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PRODID:-//Microsoft Corporation//Outlook MIMEDIR//EN
VERSION:1.0
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DTSTART:20121114T183000Z
DTEND:20121114T190000Z
LOCATION:355-EF
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:ABSTRACT: 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.
SUMMARY:High Performance Radiation Transport Simulations - Preparing for TITAN
PRIORITY:3
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