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PRODID:-//Microsoft Corporation//Outlook MIMEDIR//EN
VERSION:1.0
BEGIN:VEVENT
DTSTART:20121114T210000Z
DTEND:20121114T213000Z
LOCATION:155-E
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:ABSTRACT: As an entry for the 2012 Gorden Bell performance prize, we report=0Aperformance results of astrophysical N-body simulations of one=0Atrillion particles performed on the full system of K computer.  This=0Ais the first gravitational trillion-body simulation in the world.  =0AWe describe the scientific motivation, the=0Anumerical algorithm, the parallelization strategy, and the performance=0Aanalysis.  Unlike many previous Gordon-Bell prize winners that used=0Athe tree algorithm for astrophysical N-body simulations, we used the=0Ahybrid TreePM method, for similar level of accuracy in which the short-range=0Aforce is calculated by the tree algorithm, and the long-range force is=0Asolved by the particle-mesh algorithm.  We developed a highly-tuned=0Agravity kernel for short-range forces, and a novel communication=0Aalgorithm for long-range forces.  The average performance on 24576 and=0A82944 nodes of K computer are 1.53 and 4.45 Pflops, which=0Acorrespond to 49% and 42% of the peak speed.
SUMMARY:4.45 Pflops Astrophysical N-Body Simulation on K Computer - The Gravitational Trillion-Body Problem
PRIORITY:3
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