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Title: 2HOT: An Improved Parallel Hashed Oct-Tree N-Body Algorithm for Cosmological Simulation

We report on improvements made over the past two decades to our adaptive treecode N-body method (HOT). A mathematical and computational approach to the cosmological N-body problem is described, with performance and scalability measured up to 256k (2 18 ) processors. We present error analysis and scientific application results from a series of more than ten 69 billion (4096 3 ) particle cosmological simulations, accounting for 4×10 20 floating point operations. These results include the first simulations using the new constraints on the standard model of cosmology from the Planck satellite. Our simulations set a new standard for accuracy and scientific throughput, while meeting or exceeding the computational efficiency of the latest generation of hybrid TreePM N-body methods.
  1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, USA
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC02-05CH11231; AC52-06NA25396
Published Article
Journal Name:
Scientific Programming
Additional Journal Information:
Journal Volume: 22; Journal Issue: 2; Related Information: CHORUS Timestamp: 2016-08-23 11:33:24; Journal ID: ISSN 1058-9244
Hindawi Publishing Corporation
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