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DTSTAMP:20181221T160731Z
LOCATION:A2 Ballroom
DTSTART;TZID=America/Chicago:20181115T103000
DTEND;TZID=America/Chicago:20181115T110000
UID:submissions.supercomputing.org_SC18_sess467_gb101@linklings.com
SUMMARY:Simulating the Weak Death of the Neutron in a Femtoscale Universe 
 with Near-Exascale Computing
DESCRIPTION:ACM Gordon Bell Finalist, Awards Presentation\n\n\nSimulating 
 the Weak Death of the Neutron in a Femtoscale Universe with Near-Exascale 
 Computing\n\nBerkowitz, Clark, Gambhir, McElvain, Nicholson...\n\nThe fund
 amental particle theory called Quantum Chromodynamics (QCD) dictates every
 thing about protons and neutrons, from their intrinsic properties to inter
 actions that bind them into atomic nuclei.  Quantities that cannot be full
 y resolved through experiment, such as the neutron lifetime (whose precise
  value is important for the existence of light-atomic elements that make t
 he sun shine and life possible), may be understood through numerical solut
 ions to QCD.  We directly solve QCD using Lattice Gauge Theory and calcula
 te nuclear observables such as neutron lifetime.  We have developed an imp
 roved algorithm that exponentially decreases the time-to-solution and appl
 ied it on the new CORAL supercomputers, Sierra and Summit.  We use run-tim
 e autotuning to distribute GPU resources, achieving 20% performance at low
  node count.  We also developed optimal application mapping through a job 
 manager, which allows CPU and GPU jobs to be interleaved, yielding 15% of 
 peak performance when deployed across large fractions of CORAL.
URL:https://sc18.supercomputing.org/presentation/?id=gb101&sess=sess467
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