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LOCATION:Track 2
DTSTART;TZID=America/New_York:20201119T133000
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UID:submissions.supercomputing.org_SC20_sess148_pap204@linklings.com
SUMMARY:A Performance-Portable Nonhydrostatic Atmospheric Dycore for the E
 nergy Exascale Earth System Model Running at Cloud-Resolving Resolutions
DESCRIPTION:Paper\n\nA Performance-Portable Nonhydrostatic Atmospheric Dyc
 ore for the Energy Exascale Earth System Model Running at Cloud-Resolving 
 Resolutions\n\nBertagna, Guba, Taylor, Foucar, Larkin...\n\nWe present an 
 effort to port the nonhydrostatic atmosphere dycore of the Energy Exascale
  Earth System Model (E3SM) to efficiently run on GPU architectures, specif
 ically targeting cloud-resolving resolutions of 3 km and 1 km. To express 
 on-node parallelism we use the C++ library Kokkos, which allows us to achi
 eve a performance portable code in a largely architecture-independent way.
  Our implementation is able to achieve 0.97 simulated years per day, runni
 ng on the full Summit supercomputer when using the GPUs. To the best of ou
 r knowledge, this is the highest achievement to date by any global atmosph
 ere dycore running at such resolutions. Moreover, our C++ implementation i
 s on par with (or slightly better than) the original Fortran implementatio
 n on CPUs, proving that the GPU port did not compromise the efficiency on 
 conventional CPUs.\n\nTag: Applications, Extreme Scale Computing, Mixed-pr
 ecision\n\nRegistration Category: Tech Program Reg Pass
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