[MITgcm-support] using gather/scatter to work with global fields

[Matthew Mazloff]

Hi Katherine

Do you have
DISABLE_MPI_READY_TO_RECEIVE
defined.  If you do, perhaps try it with it undefined.

-Matt



On Aug 23, 2012, at 10:40 AM, Katherine Quinn wrote:

> Hi all,
> Within the MITgcm code (not matlab) I need to gather tiled variables  
> into a global array, specifically I'm trying to gather XC and YC.   
> I'm using the subroutine gather_2d_r4, which suggests "barrier  
> calls" before and after but it seems no matter what various barrier  
> calls I use, when I look at the global array there's chunks of tiles  
> missing.  Other relevant info - the MITgcm setup is for ecco version  
> 4 runs, with all_exch2 turned on.
> Here's the relevant portions of my code, please suggest what I'm  
> doing wrong:
>
> C     == Global variables ===
> #include "SIZE.h"
> #include "EEPARAMS.h"
> #include "EESUPPORT.h"
> #include "PARAMS.h"
> #ifdef ALLOW_EXCH2
> # include "W2_EXCH2_SIZE.h"
> # include "W2_EXCH2_TOPOLOGY.h"
> # include "W2_EXCH2_PARAMS.h"
> #endif /* ALLOW_EXCH2 */
> #include "EEBUFF_SCPU.h"
> #include "GRID.h"
>
> C     INPUT/OUTPUT PARAMETERS:
> C     == Routine arguments ==
> C     myThid - Thread number for this instance of the routine.
>      INTEGER  myThid
>
> C     LOCAL VARIABLES:
>      LOGICAL zeroBuff, useExch2ioLayOut
>      INTEGER xSize, ySize
> #ifdef ALLOW_EXCH2
>      _RL  XC_global(exch2_global_Nx,exch2_global_Ny)
>      _RL  YC_global(exch2_global_Nx,exch2_global_Ny)
> #else  /* ALLOW_EXCH2 */
>      _RS  XC_global(Nx,Ny)
>      _RS  YC_global(Nx,Ny)
> #endif /* ALLOW_EXCH2 */
>
> C Set dimensions and flags (e.g. mdsio_write_field.F)
>      xSize = Nx
>      ySize = Ny
>      useExch2ioLayOut = .FALSE.
>      zeroBuff = .TRUE.
> #ifdef ALLOW_EXCH2
>      IF ( W2_useE2ioLayOut ) THEN
>         xSize = exch2_global_Nx
>         ySize = exch2_global_Ny
>         useExch2ioLayOut = .TRUE.
>      ENDIF
> #endif /* ALLOW_EXCH2 */
>
> C gather XC and YC into global model grid
>
>      CALL BAR2( myThid )
>      _BEGIN_MASTER( myThid )
>      CALL GATHER_2D_R4(
>     O                  XC_global,
>     I                  XC,
>     I                  xSize, ySize,
>     I                  useExch2ioLayOut,
>     I                  zeroBuff,
>     I                  myThid )
>      _END_MASTER( myThid )
>      CALL BAR2( myThid )
>
>      _BEGIN_MASTER( myThid )
>      CALL GATHER_2D_R4(
>     O                  YC_global,
>     I                  YC,
>     I                  xSize, ySize,
>     I                  useExch2ioLayOut,
>     I                  zeroBuff,
>     I                  myThid )
>      _END_MASTER( myThid )
>      CALL BAR2( myThid )
>
>
>
> -- 
> Katherine J. Quinn
> Atmospheric and Environmental Research         voice: 781-761-2234
> 131 Hartwell Avenue                              fax: 781-761-2299
> Lexington, MA  02421-3126                     e-mail: kquinn at aer.com
>
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