| 1 | MODULE mpp_map |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE mpp_mpa *** |
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| 4 | !! NEMOVAR: MPP global grid point mapping to processors |
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| 5 | !!====================================================================== |
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| 6 | !! History : 2.0 ! 2007-08 (K. Mogensen) Original code |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! mppmap_init : Initialize mppmap. |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | USE par_kind, ONLY : wp ! Precision variables |
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| 13 | USE par_oce , ONLY : jpi, jpj ! Ocean parameters |
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| 14 | USE dom_oce , ONLY : mig, mjg, nldi, nlei, nldj, nlej, narea ! Ocean space and time domain variables |
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| 15 | #if defined key_mpp_mpi |
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| 16 | USE lib_mpp, ONLY : mpi_comm_opa ! MPP library |
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| 17 | #endif |
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| 18 | USE in_out_manager ! I/O manager |
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| 19 | |
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| 20 | IMPLICIT NONE |
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| 21 | PRIVATE |
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| 22 | |
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| 23 | PUBLIC :: mppmap_init, mppmap !: ??? |
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| 24 | |
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| 25 | INTEGER, DIMENSION(:,:), ALLOCATABLE :: mppmap ! ??? |
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| 26 | |
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| 27 | !! * Control permutation of array indices |
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| 28 | !! No array indices to control |
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| 29 | |
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| 30 | !!---------------------------------------------------------------------- |
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| 31 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 32 | !! $Id$ |
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| 33 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 34 | !!---------------------------------------------------------------------- |
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| 35 | CONTAINS |
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| 36 | |
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| 37 | SUBROUTINE mppmap_init |
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| 38 | !!---------------------------------------------------------------------- |
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| 39 | !! *** ROUTINE mppmap_init *** |
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| 40 | !! |
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| 41 | !! ** Purpose : Setup a global map of processor rank for all gridpoints |
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| 42 | !! |
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| 43 | !! ** Method : MPI all reduce. |
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| 44 | !! |
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| 45 | !! ** Action : This does only work for MPI. |
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| 46 | !! |
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| 47 | !! References : http://www.mpi-forum.org |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | INTEGER, DIMENSION(:,:), ALLOCATABLE :: imppmap ! |
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| 50 | #if defined key_mpp_mpi |
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| 51 | INTEGER :: ierr |
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| 52 | |
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| 53 | INCLUDE 'mpif.h' |
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| 54 | #endif |
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| 55 | !!---------------------------------------------------------------------- |
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| 56 | |
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| 57 | ALLOCATE( & |
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| 58 | & mppmap(jpiglo,jpjglo) & |
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| 59 | & ) |
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| 60 | |
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| 61 | ! Initialize local imppmap |
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| 62 | |
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| 63 | ALLOCATE( & |
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| 64 | & imppmap(jpiglo,jpjglo) & |
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| 65 | & ) |
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| 66 | imppmap(:,:) = 0 |
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| 67 | |
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| 68 | ! Setup local grid points |
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| 69 | imppmap(mig(nldi):mig(nlei),mjg(nldj):mjg(nlej)) = narea |
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| 70 | |
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| 71 | ! Get global data |
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| 72 | |
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| 73 | #if defined key_mpp_mpi |
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| 74 | |
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| 75 | ! Call the MPI library to find the max across processors |
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| 76 | CALL mpi_allreduce( imppmap, mppmap, jpiglo*jpjglo, mpi_integer, & |
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| 77 | & mpi_max, mpi_comm_opa, ierr ) |
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| 78 | #else |
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| 79 | |
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| 80 | ! No MPP: Just copy the data |
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| 81 | mppmap(:,:) = imppmap(:,:) |
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| 82 | #endif |
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| 83 | ! |
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| 84 | END SUBROUTINE mppmap_init |
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| 85 | |
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| 86 | !!====================================================================== |
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| 87 | END MODULE mpp_map |
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