SC Conference - Activity Details

Implicit Monte Carlo Radiation Transport for Roadrunner

T. M. Kelley  (Los Alamos National Laboratory)
P. J. Henning  (Los Alamos National Laboratory)
Posters Session
Tuesday,  05:15PM - 07:00PM
Room Rotunda Lobby
Implicit Monte Carlo is a method of simulating thermal X-ray radiation transport for problems such as supernova explosions and inertial confinement fusion. We have significantly re-engineered Milagro, LANL’s production IMC code, to run on the hybrid Roadrunner architecture. To learn as much as possible about adapting to the Roadrunner architecture, we pursued two independent adaptation paths. One started with the existing code base and evolved incrementally, first adapting the core particle transport routines to the Cell SPE, then restructuring the application (running on the Opteron) to offload particle transport to the Cell. The other approach freely modified data structures and control flow, packing data into work blocks that can be processed on any available resource—Cell or Opteron. We present timing and accuracy results on representative problems and our plans to integrate the research results into the production code, where it will be used for supernova simulations.
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