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DTSTAMP:20210916T132451Z
LOCATION:Jean Calvin
DTSTART;TZID=Europe/Stockholm:20210707T143000
DTEND;TZID=Europe/Stockholm:20210707T150000
UID:submissions.pasc-conference.org_PASC21_sess148_msa108@linklings.com
SUMMARY:Portability and Performance Efforts for the E3SM-Multiscale Modeli
 ng Framework on Summit
DESCRIPTION:Minisymposium\n\nPortability and Performance Efforts for the E
 3SM-Multiscale Modeling Framework on Summit\n\nNorman, Lyngaas, Taylor, ha
 nnah, Hillman...\n\nThe Energy Exascale Earth System Model (E3SM), a high-
 resolution Global Climate Model (GCM) funded by the U.S. Department of Ene
 rgy (DOE), is seeking a better representation of clouds with the Multi-sca
 le Modeling Framework (MMF) approach, wherein a high-resolution Cloud Reso
 lving Model (CRM) is embedded at each GCM grid point to explicitly simulat
 e moist convection. At roughly 20K lines of Fortran 90 code, the CRM consu
 mes the vast majority of the runtime, making it an ideal target for GPU ac
 celeration. Further, it requires no MPI communication because each CRM onl
 y communicates with the GCM column in which it is embedded. The original C
 RM code, the System for Atmospheric Modeling, or SAM, has been ported to p
 erformance portable C++ to run on Nvidia and AMD GPUs (with Intel soon to 
 follow). This presentation covers the development of a new CRM code called
  the Portable Atmosphere Model, or PAM, with new numerical discretization 
 choices aimed at simultaneously increasing accuracy and decreasing time to
  solution. This is achieved via higher-order numerical methods and seeking
  larger and variable time steps through semi-implicit and soundproof appro
 aches for acoustics. Emphasis is placed on reducing the number of kernel l
 aunches and maximizing the workload per kernel launch. Also included in th
 is presentation is the inclusion of physics from other E3SM projects, such
  as the P3 microphysics scheme developed by the SCREAM project.\n\nDomain:
  CS and Math, Climate and Weather
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