Statistics – Computation
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe..62g&link_type=abstract
"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 62-62"
Statistics
Computation
Scientific paper
We present performance measurements of direct gravitational N-body simulation on the grid, with and without specialized (GRAPE-6) hardware. Our inter-continental virtual-organization consists of three sites, one in Tokyo, one in Philadelphia and one in Amsterdam. We run simulations with up to 131072 particles for a variety of topologies. As expected, high performance simulations over the entire planet are dominated by network latency. Based on these timings we construct a model to predict the performance of a hypothetical grid consisting of all the 582 GRAPE-6 modules on Earth. Such setup reaches break-even between network communication and computation for N˜10^8 particles, resulting in a compute time of about one year for 1~N-body time unit. Much better performance can be obtained using only a local cluster of GRAPEs. Equipping the Netherlands DAS-3 grid with GRAPEs would achieve break-even at a million particles, resulting in a compute time of about half an hour for 1~N-body time unit.
Groen Derek
Gualandris Alessia
McMillan Steve
Portegies Zwart Simon
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