Publication Type
Conference Paper
Publication Date
Conference Name
SciDAC 2010
Conference Location
Chattanooga, Tennessee, United States of America
Conference Sponsor
Department of Energy Office of Science
Conference Date
-
Abstract
We have implemented a new multilevel parallel decomposition in the Denovo discrete
ordinates radiation transport code. In concert with Krylov subspace iterative solvers, the
multilevel decomposition allows concurrency over energy in addition to space-angle. The original
space-angle partitioning in Denovo placed an e ective limit on the scalability of the transport
solver that was highly dependent on the problem size. The added phase-space concurrency
combined with the high-performance Krylov solvers has enabled weak scaling to 100K cores on
the Jaguar XT5 supercomputer. Furthermore, the multilevel decomposition provides enough
concurrency to scale to exascale computing and beyond.
