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DTSTAMP:20260421T090513Z
LOCATION:Bldg. 6 - Room 103
DTSTART;TZID=Europe/Stockholm:20260701T103000
DTEND;TZID=Europe/Stockholm:20260701T110000
UID:submissions.pasc-conference.org_PASC26_sess153_msa162@linklings.com
SUMMARY:Putting the Exascale in the Energy Exascale Earth System Model
DESCRIPTION:Aaron Donahue (Lawrence Livermore National Laboratory)\n\nU.S.
  DOE scientists are porting the Energy Exascale Earth System Model (E3SM) 
 to a performance-portable framework capable of efficient execution on emer
 ging exascale architectures. We summarize lessons learned from modernizing
  the atmosphere component, including migrating legacy Fortran to C++ and a
 dopting the Kokkos performance-portability library to target diverse CPU a
 nd GPU platforms. We discuss key technical and organizational challenges e
 ncountered during the transition, what proved effective for maintaining sc
 ientific fidelity and verification while refactoring for node-level parall
 elism, and how performance and developer productivity were balanced. Final
 ly, we describe how these outcomes inform the next phase of E3SM exascale 
 modernization, specifically the ongoing port of the ocean component under 
 Project Omega, and how the atmosphere experience is shaping design choices
 , workflows, and risk reduction for a fully exascale Earth system model.\n
 \nDomain: Climate, Weather, and Earth Sciences, Computational Methods and 
 Applied Mathematics\n\nSession Chairs: Georgiana Mania (DKRZ) and Xavier L
 apillonne (MeteoSwiss)\n\n
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