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DTSTART:19700308T020000
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DTSTAMP:20190719T085744Z
LOCATION:HG D 3.2
DTSTART;TZID=Europe/Stockholm:20190613T171500
DTEND;TZID=Europe/Stockholm:20190613T174500
UID:submissions.pasc-conference.org_PASC19_sess152_msa122@linklings.com
SUMMARY:Ready, Thready, Go: Exploiting MPI + OpenMP in Operational Weather
  Forecasting
DESCRIPTION:Minisymposium\nEmerging Application Domains, Climate and Weath
 er, Life Sciences\n\nReady, Thready, Go: Exploiting MPI + OpenMP in Operat
 ional Weather Forecasting\n\nSelwood\n\nDr. Paul Selwood will discuss how 
 accurate weather forecasts are hugely important to a nation’s econom
 y. They help keep transport links open, keep electricity flowing and enabl
 e emergency response to extreme weather events. The Unified Model is a key
  component in the Met Office’s ability to generate hundreds of forec
 asts every day to tight operational timescales. It is constantly being imp
 roved with more accurate and computationally expensive physics. MPI + Open
 MP has been an important tool in meeting the scalability challenge this ha
 s presented. The Unified Model has had a long journey with parallelism, fr
 om autotasking on Cray vector systems, through being a MPI-only parallel m
 odel and latterly to an MPI + OpenMP hybrid one. In doing so it has been a
 ble to adapt to over 20 years of different supercomputer architectures. MP
 I + OpenMP has enabled the use of hyperthreads, been key to a number of I/
 O accelerations, has allowed experimentation with dynamic load balancing a
 nd has become a fully-fledged part of the model’s parallelisation st
 rategy. This presentation will share this journey (there is far more than 
 simple !OMP PARALLEL DO) along with lessons learned along the way.
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