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

2014 ◽  
Vol 22 (2) ◽  
pp. 109-124
Author(s):  
Michael S. Warren
Keyword(s):  
Computational Efficiency ◽  
Body Problem ◽  
Computational Approach ◽  
Floating Point ◽  
Scientific Application ◽  
The Past ◽  
N Body Problem ◽  
The Standard Model ◽  
Body Method ◽  
Planck Satellite

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 (218) processors. We present error analysis and scientific application results from a series of more than ten 69 billion (40963) particle cosmological simulations, accounting for 4×1020floating 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.

scholarly journals GRAPE Accelerators

2010 ◽  
Vol 6 (S270) ◽  
pp. 389-396
Author(s):  
Junichiro Makino
Keyword(s):  
Body Problem ◽  
Future Directions ◽  
The Past ◽  
N Body Problem ◽  
Pros And Cons ◽  
Specialized Hardware ◽  
Programmable Processors

AbstractI'll overview the past, present, and future of the GRAPE project, which started as the effort to design and develop specialized hardware for gravitational N-body problem. The current hardware, GRAPE-DR, has an architecture quite different from previous GRAPEs, in the sense that it is a collection of small, but programmable processors, while previous GRAPEs had hardwired pipelines. I'll discuss pros and cons of these two approaches, comparisons with other accelerators and future directions.

scholarly journals On frequency estimations in phase fitted variational integrators for the general N-body problem

PAMM ◽  
2013 ◽  
Vol 13 (1) ◽  
pp. 33-34
Author(s):  
Odysseas Kosmas ◽  
Sigrid Leyendecker
Keyword(s):  
Body Problem ◽  
Variational Integrators ◽  
N Body Problem
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