Date: 2021-03-03T22:27:02+00:00

Actual source code: ex12.c
petsc-3.14.5 2021-03-03
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      2: static char help[] = "Tests DMGetGlobalVector() and DMRestoreGlobalVector().\n\n";

      4: /*
      5: Use the options
      6:      -da_grid_x <nx> - number of grid points in x direction, if M < 0
      7:      -da_grid_y <ny> - number of grid points in y direction, if N < 0
      8:      -da_processors_x <MX> number of processors in x directio
      9:      -da_processors_y <MY> number of processors in x direction
     10: */

     12: #include <petscdm.h>
     13: #include <petscdmda.h>

     15: int main(int argc,char **argv)
     16: {
     17:   PetscInt         M = 10,N = 8;
     18:   PetscErrorCode   ierr;
     19:   PetscBool        flg = PETSC_FALSE;
     20:   DM               da;
     21:   Vec              global1,global2,global3;
     22:   DMBoundaryType   bx    = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE;
     23:   DMDAStencilType  stype = DMDA_STENCIL_BOX;

     25:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
     26:   PetscOptionsGetBool(NULL,NULL,"-star_stencil",&flg,NULL);
     27:   if (flg) stype = DMDA_STENCIL_STAR;

     29:   /* Create distributed array and get vectors */
     30:   DMDACreate2d(PETSC_COMM_WORLD,bx,by,stype,M,N,PETSC_DECIDE,PETSC_DECIDE,1,1,NULL,NULL,&da);
     31:   DMSetFromOptions(da);
     32:   DMSetUp(da);
     33:   DMGetGlobalVector(da,&global1);
     34:   DMGetGlobalVector(da,&global2);
     35:   DMRestoreGlobalVector(da,&global1);
     36:   DMRestoreGlobalVector(da,&global2);
     37:   DMGetGlobalVector(da,&global1);
     38:   DMGetGlobalVector(da,&global3);
     39:   DMGetGlobalVector(da,&global2);
     40:   DMRestoreGlobalVector(da,&global1);
     41:   DMRestoreGlobalVector(da,&global3);
     42:   DMRestoreGlobalVector(da,&global2);
     43:   DMGetGlobalVector(da,&global1);
     44:   DMGetGlobalVector(da,&global3);
     45:   DMGetGlobalVector(da,&global2);
     46:   DMRestoreGlobalVector(da,&global1);
     47:   DMRestoreGlobalVector(da,&global3);
     48:   DMRestoreGlobalVector(da,&global2);
     49:   DMDestroy(&da);
     50:   PetscFinalize();
     51:   return ierr;
     52: }

     56: /*TEST

     58:    test:

     60: TEST*/