Lab Home | Phone | Search
Center for Nonlinear Studies  Center for Nonlinear Studies
 Home 
 People 
 Current 
 Executive Committee 
 Postdocs 
 Visitors 
 Students 
 Research 
 Publications 
 Conferences 
 Workshops 
 Sponsorship 
 Talks 
 Seminars 
 Postdoc Seminars Archive 
 Quantum Lunch 
 Quantum Lunch Archive 
 P/T Colloquia 
 Archive 
 Ulam Scholar 
 
 Postdoc Nominations 
 Student Requests 
 Student Program 
 Visitor Requests 
 Description 
 Past Visitors 
 Services 
 General 
 
 History of CNLS 
 
 Maps, Directions 
 CNLS Office 
 T-Division 
 LANL 
 
Monday, October 27, 2014
3:00 PM - 4:00 PM
CNLS Conference Room (TA-3, Bldg 1690)

Colloquium

Petaflops are not the Problem (and other Lessons from the first Trillion particle simulation of the Universe)

Michael Warren
Nuclear and Particle Physics, Astrophysics and Cosmology (T-2)

We recently published scientific results from the first complete cosmological N-body simulation using over one Trillion (1e12) particles. Such models are essential for many aspects of the study of dark matter and dark energy. The simulation was performed with our 2HOT code, a purely tree-based adaptive N-body method, running on 200,000 cores and 12,000 GPUs of the Titan supercomputer at ORNL. The simulation ran at 3-6 Petaflops/s from start to finish in a single 34 hour period on April 18-19 2014. We will describe our mathematical and computational approach, present our scientific results, review the initial 55 Terabyte public data release, and discuss the numerous challenges to computing effectively at these scales. For additional details, see http://darkskysimulations.info

Host: Robert Ecke