The GungHo Dynamical Core
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1 The GungHo Dynamical Core The Met Office STFC Daresbury Laboratory * University of Manchester Rupert Ford * STFC's effort was funded by the Hartree Centre 6th 7th April 2016, 4th ENES HPC Workshop
2 GungHo Globally Uniform, Next Generation, Highly Optimised To research, design and develop a new dynamical core suitable for operational, global and regional, weather and climate simulation on massively parallel computers of the size envisaged over the coming 20 years. Remove the pole problem (replace lat-lon grid) Aimed at massively parallel computers 10^6 way parallel petaflop Split into two phases: 2 years research ( ) 3 years development ( ) Met Office, STFC, Universities of: Bath, Exeter, Imperial, Leeds, Manchester, Reading, Warwick
3 GungHo (Most likely) Cubed Sphere Multi-grid Finite element approach (Order) Separate Science from HPC optimisation (PSyKAl) Performance portability Single science source 'Dynamo' prototype implementation PSyclone generation of PSy layer
4 PSyKAl Science Algorithm Algorithm Performance PSy PSy Kernels Kernels
5 Dynamo algorithm example... From lhs_alg_mod.x90 Multiple kernels within an invoke() 'pointwise' not yet supported in PSyclone
6 Dynamo kernel example... From matrix_vector_kernel_mod.f90
7 PSyclone Algorithm Algorithm Generator Generator ast Alg Alg Code Code ast PSy PSy Code Code ast Alg Alg Code Code Parser Parser psy info PSy PSy Generator Generator Kernel Kernel Codes Codes schedule Transforms Transforms Transformation Transformation
8 PSyclone Scripts example... > python../../psyclone/src/generator.py lhs_alg_mod.x90 \ d../../dynamo/kernel oalg alg.f90 opsy psy.f90 \ nodm s./global.py Vanilla, no dm
9 PSyclone Scripts example... > python../../psyclone/src/generator.py lhs_alg_mod.x90 \ d../../dynamo/kernel oalg alg.f90 opsy psy.f90 \ nodm s./global.py Colours, no dm
10 PSyclone Scripts example... > python../../psyclone/src/generator.py lhs_alg_mod.x90 \ d../../dynamo/kernel oalg alg.f90 opsy psy.f90 \ nodm s./global.py Colours + OpenMP, no dm
11 PSyclone Scripts example... > python../../psyclone/src/generator.py lhs_alg_mod.x90 \ d../../dynamo/kernel oalg alg.f90 opsy psy.f90 \ s./global.py Vanilla, dm
12 PSyclone Scripts example... > python../../psyclone/src/generator.py lhs_alg_mod.x90 \ d../../dynamo/kernel oalg alg.f90 opsy psy.f90 \ s./global.py Colours, dm
13 PSyclone Scripts example... > python../../psyclone/src/generator.py lhs_alg_mod.x90 \ d../../dynamo/kernel oalg alg.f90 opsy psy.f90 \ s./global.py OpenMP + dm
14 PSyclone Scripts example...
15 GungHo, LFRic, PSyKAl, Dynamo and PSyclone Summary GungHo project LFRic project Met Office project to deliver UM Atmosphere replacement using new dynamical core PSyKAl consortium to develop a new dynamical core separation of concerns suggested by GungHo project and implemented in Dynamo and PSyclone Dynamo software prototype GungHo dynamical core tests the science and software engineering PSyclone software Code generation system used by Dynamo
16 GungHo, LFRic, PSyKAl, Dynamo and PSyclone Summary GungHo project Complete LFRic project separation of concerns suggested by GungHo project and implemented in Dynamo and PSyclone Dynamo software LFRic GungHo prototype GungHo dynamical core infrastructure Dynamical Core Met Office project to deliver UM Atmosphere replacement using new dynamical core PSyKAl consortium to develop a new dynamical core tests the science and software engineering PSyclone software Code generation system used by Dynamo
17 Dynamo Status Version 1.0 released 31st March : Whoop! Fully functional infrastructure Initial science : solver Uses PSyclone for parallelism Sequential, OpenMP parallel, MPI parallel or mixed mode
18 Going MPI Parallel Dynamo infrastructure and Psyclone support PSyclone command line change > python generator.py oalg alg.f90 opsy psy.f90 file.f90 nodm No Scientists were harmed
19 Dynamo Initial MPI results
20 Going OpenMP Parallel Dynamo infrastructure and Psyclone support PSyclone script > python generator.py oalg alg.f90 opsy psy.f90 file.f90 s script.py No Scientists were harmed
21 Dynamo Initial OpenMP results
22 Dynamo Future Dynamo => GungHo science + LFRic infrastructure Continued development under LFRic Continued collaboration with STFC Open source, new repository Regular releases (~3 monthly) Full dynamical core + some physics Optimised code using PSyclone Determine accuracy, scalability and efficiency
23 Wider collaboration? PSyKAl PSyclone FE and FD/FV NEMO-lite 2D implementation Commonality with STELLA
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