/[MITgcm]/MITgcm/eesupp/src/gather_2d.F
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Contents of /MITgcm/eesupp/src/gather_2d.F

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Revision 1.2 - (show annotations) (download)
Tue Feb 18 05:33:53 2003 UTC (21 years, 2 months ago) by dimitri
Branch: MAIN
CVS Tags: checkpoint48f_post, checkpoint51k_post, checkpoint51l_post, checkpoint51j_post, checkpoint48i_post, checkpoint50d_pre, checkpoint50e_post, checkpoint50c_post, checkpoint48h_post, checkpoint50c_pre, branchpoint-genmake2, checkpoint50h_post, checkpoint51a_post, checkpoint51i_post, checkpoint50b_pre, checkpoint51e_post, checkpoint51b_post, checkpoint51l_pre, checkpoint51c_post, checkpoint49, checkpoint51f_pre, checkpoint50i_post, checkpoint48g_post, checkpoint51, checkpoint50, checkpoint50d_post, checkpoint51b_pre, checkpoint51h_pre, checkpoint50g_post, checkpoint51g_post, checkpoint51f_post, checkpoint50b_post, checkpoint50f_post, checkpoint50f_pre, checkpoint51d_post, checkpoint50a_post, checkpoint51m_post, checkpoint50e_pre, checkpoint51i_pre
Branch point for: branch-genmake2, tg2-branch, ecco-branch
Changes since 1.1: +89 -0 lines 
Merging from release1_p12:
o Modifications for using pkg/exf with pkg/seaice
  - improved description of the various forcing configurations
  - added basic radiation bulk formulae to pkg/exf
  - units/sign fix for evap computation in exf_getffields.F
  - updated verification/global_with_exf/results/output.txt
o Added pkg/sbo for computing IERS Special Bureau for the Oceans
  (SBO) core products, including oceanic mass, center-of-mass,
  angular, and bottom pressure (see pkg/sbo/README.sbo).
o Lower bound for viscosity/diffusivity in pkg/kpp/kpp_routines.F
  to avoid negative values in shallow regions.
  - updated verification/natl_box/results/output.txt
  - updated verification/lab_sea/results/output.txt
o MPI gather, scatter: eesupp/src/gather_2d.F and scatter_2d.F
o Added useSingleCpuIO option (see PARAMS.h).
o Updated useSingleCpuIO option in mdsio_writefield.F to
  work with multi-field files, e.g., for single-file pickup.
o pkg/seaice:
  - bug fix in growth.F: QNET for no shortwave case
  - added HeffFile for specifying initial sea-ice thickness
  - changed SEAICE_EXTERNAL_FLUXES wind stress implementation
o Added missing /* */ to CPP comments in pkg/seaice, pkg/exf,
  kpp_transport_t.F, forward_step.F, and the_main_loop.F
o pkg/seaice:
  - adjoint-friendly modifications
  - added a SEAICE_WRITE_PICKUP at end of the_model_main.F
1 #include "CPP_OPTIONS.h"
2
3 SUBROUTINE GATHER_2D( global, local, myThid )
4 C Gather elements of a 2-D array from all mpi processes to process 0.
5 IMPLICIT NONE
6 #include "SIZE.h"
7 #include "EEPARAMS.h"
8 #include "EESUPPORT.h"
9 C mythid - thread number for this instance of the routine.
10 C global,local - working arrays used to transfer 2-D fields
11 INTEGER mythid
12 Real*8 global(Nx,Ny)
13 _RL local(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
14
15 #ifdef ALLOW_USE_MPI
16 COMMON /GlobalLo/ mpi_myXGlobalLo, mpi_myYGlobalLo
17 INTEGER mpi_myXGlobalLo(nPx*nPy)
18 INTEGER mpi_myYGlobalLo(nPx*nPy)
19
20 _RL temp(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
21 INTEGER istatus(MPI_STATUS_SIZE), ierr
22 INTEGER idest, itag, npe, ready_to_receive
23 INTEGER iP, jP, iG,jG, i, j, bi, bj, lbuff
24
25 C-- Make everyone wait except for master thread.
26 _BARRIER
27 _BEGIN_MASTER( myThid )
28 lbuff = (sNx+2*OLx)*nSx*(sNy+2*OLy)*nSy
29 idest = 0
30 itag = 0
31 ready_to_receive = 0
32
33 IF( mpiMyId .EQ. 0 ) THEN
34
35 C-- Process 0 fills-in its local data
36 npe = 0
37 DO bj=1,nSy
38 DO bi=1,nSx
39 DO j=1,sNy
40 DO i=1,sNx
41 iP = (bi-1)*sNx+i
42 jP = (bj-1)*sNy+j
43 iG = mpi_myXGlobalLo(npe+1)-1+(bi-1)*sNx+i
44 jG = mpi_myYGlobalLo(npe+1)-1+(bj-1)*sNy+j
45 global(iG,jG) = local(i,j,bi,bj)
46 ENDDO
47 ENDDO
48 ENDDO
49 ENDDO
50
51 C-- Process 0 polls and receives data from each process in turn
52 DO npe = 1, numberOfProcs-1
53 CALL MPI_SEND (ready_to_receive, 1, MPI_INTEGER,
54 & npe, itag, MPI_COMM_MODEL, ierr)
55 CALL MPI_RECV (temp, lbuff, MPI_DOUBLE_PRECISION,
56 & npe, itag, MPI_COMM_MODEL, istatus, ierr)
57
58 C-- Process 0 gathers the local arrays into a global array.
59 DO bj=1,nSy
60 DO bi=1,nSx
61 DO j=1,sNy
62 DO i=1,sNx
63 iP = (bi-1)*sNx+i
64 jP = (bj-1)*sNy+j
65 iG = mpi_myXGlobalLo(npe+1)-1+(bi-1)*sNx+i
66 jG = mpi_myYGlobalLo(npe+1)-1+(bj-1)*sNy+j
67 global(iG,jG) = temp(i,j,bi,bj)
68 ENDDO
69 ENDDO
70 ENDDO
71 ENDDO
72 ENDDO
73
74 ELSE
75
76 C-- All proceses except 0 wait to be polled then send local array
77 CALL MPI_RECV (ready_to_receive, 1, MPI_INTEGER,
78 & idest, itag, MPI_COMM_MODEL, istatus, ierr)
79 CALL MPI_SEND (local, lbuff, MPI_DOUBLE_PRECISION,
80 & idest, itag, MPI_COMM_MODEL, ierr)
81
82 ENDIF
83
84 _END_MASTER( myThid )
85 _BARRIER
86
87 #endif /* ALLOW_USE_MPI */
88 RETURN
89 END
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