Actual source code: ex1.c


  2: static char help[] = "Tests various DM routines.\n\n";

  4: #include <petscdm.h>
  5: #include <petscdmda.h>

  7: int main(int argc,char **argv)
  8: {
  9:   PetscMPIInt    rank;
 10:   PetscInt       M = 10,N = 8,m = PETSC_DECIDE,n = PETSC_DECIDE;
 11:   DM             da;
 12:   PetscViewer    viewer;
 13:   Vec            local,global;
 14:   PetscScalar    value;

 16:   PetscInitialize(&argc,&argv,(char*)0,help);
 17:   PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer);

 19:   /* Read options */
 20:   PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);
 21:   PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);
 22:   PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);
 23:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);

 25:   /* Create distributed array and get vectors */
 26:   DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,M,N,m,n,1,1,NULL,NULL,&da);
 27:   DMSetFromOptions(da);
 28:   DMSetUp(da);
 29:   DMCreateGlobalVector(da,&global);
 30:   DMCreateLocalVector(da,&local);

 32:   value = -3.0;
 33:   VecSet(global,value);
 34:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 35:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 37:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 38:   value = rank+1;
 39:   VecScale(local,value);
 40:   DMLocalToGlobalBegin(da,local,ADD_VALUES,global);
 41:   DMLocalToGlobalEnd(da,local,ADD_VALUES,global);

 43:   VecView(global,PETSC_VIEWER_STDOUT_WORLD);
 44:   DMView(da,viewer);

 46:   /* Free memory */
 47:   PetscViewerDestroy(&viewer);
 48:   VecDestroy(&local);
 49:   VecDestroy(&global);
 50:   DMDestroy(&da);
 51:   PetscFinalize();
 52:   return 0;
 53: }

 55: /*TEST

 57:    test:
 58:       nsize: 2
 59:       args: -nox
 60:       filter: grep -v -i Object

 62:    test:
 63:       suffix: cuda1
 64:       requires: cuda
 65:       args: -dm_vec_type cuda -nox
 66:       filter: grep -v -i Object

 68:    test:
 69:       suffix: cuda2
 70:       nsize: 2
 71:       requires: cuda
 72:       args: -dm_vec_type cuda -nox
 73:       filter: grep -v -i Object

 75: TEST*/