Scientific Programming / 2020 / Article / Alg 1

Research Article

Analysis of a New MPI Process Distribution for the Weather Research and Forecasting (WRF) Model

Algorithm 1

Integration step (solve_em) pseudocode obtained from WRF Fortran code.
(1)function COMPUTE_SOMETHING(tile)
(2)for to do         Iterate the tile
(3)  for to do      The iteration order is OK
(4)   for to do
(5)    tile[i][k][j] = …      Do something on the grid
(6)   end for
(7)  end for
(8)end for
(9)end function
(10)procedure SOLVE_EM(subdomain)
(11) …                      Initialization
(12) !$OMP PARALLEL DO             One thread per tile
(13)for to numtiles do           Iterate tiles
(14)  compute_something(subdomain[t])    Pass the tile to the function to compute something
(15)end for
(16) !$OMP END PARALLEL DO       End of parallel region
(17)if DM_PARALLEL then          If MPI is being used
(18)  HALO_EM∗∗∗.inc    Send halos to other adjacent processes depending on the stencil
(19)end if
(20) …   Replicate the same loop structure tens of times for the different variables to compute on the subdomain
(21)end procedure

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