Actual source code: ex7.c


  2: static char help[] = "Tests DMLocalToLocalxxx() for DMDA.\n\n";

  4: #include <petscdmda.h>

  6: int main(int argc,char **argv)
  7: {
  8:   PetscMPIInt      rank;
  9:   PetscInt         M=8,dof=1,stencil_width=1,i,start,end,P=5,N = 6,m=PETSC_DECIDE,n=PETSC_DECIDE,p=PETSC_DECIDE,pt = 0,st = 0;
 10:   PetscBool        flg = PETSC_FALSE,flg2,flg3;
 11:   DMBoundaryType   periodic;
 12:   DMDAStencilType  stencil_type;
 13:   DM               da;
 14:   Vec              local,global,local_copy;
 15:   PetscScalar      value;
 16:   PetscReal        norm,work;
 17:   PetscViewer      viewer;
 18:   char             filename[64];
 19:   FILE             *file;

 21:   PetscInitialize(&argc,&argv,(char*)0,help);
 22:   PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);
 23:   PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);
 24:   PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL);
 25:   PetscOptionsGetInt(NULL,NULL,"-stencil_width",&stencil_width,NULL);
 26:   PetscOptionsGetInt(NULL,NULL,"-periodic",&pt,NULL);

 28:   periodic = (DMBoundaryType) pt;

 30:   PetscOptionsGetInt(NULL,NULL,"-stencil_type",&st,NULL);

 32:   stencil_type = (DMDAStencilType) st;

 34:   PetscOptionsHasName(NULL,NULL,"-grid2d",&flg2);
 35:   PetscOptionsHasName(NULL,NULL,"-grid3d",&flg3);
 36:   if (flg2) {
 37:     DMDACreate2d(PETSC_COMM_WORLD,periodic,periodic,stencil_type,M,N,m,n,dof,stencil_width,NULL,NULL,&da);
 38:   } else if (flg3) {
 39:     DMDACreate3d(PETSC_COMM_WORLD,periodic,periodic,periodic,stencil_type,M,N,P,m,n,p,dof,stencil_width,NULL,NULL,NULL,&da);
 40:   } else {
 41:     DMDACreate1d(PETSC_COMM_WORLD,periodic,M,dof,stencil_width,NULL,&da);
 42:   }
 43:   DMSetFromOptions(da);
 44:   DMSetUp(da);

 46:   DMCreateGlobalVector(da,&global);
 47:   DMCreateLocalVector(da,&local);
 48:   VecDuplicate(local,&local_copy);

 50:   /* zero out vectors so that ghostpoints are zero */
 51:   value = 0;
 52:   VecSet(local,value);
 53:   VecSet(local_copy,value);

 55:   VecGetOwnershipRange(global,&start,&end);
 56:   for (i=start; i<end; i++) {
 57:     value = i + 1;
 58:     VecSetValues(global,1,&i,&value,INSERT_VALUES);
 59:   }
 60:   VecAssemblyBegin(global);
 61:   VecAssemblyEnd(global);

 63:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 64:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 66:   DMLocalToLocalBegin(da,local,INSERT_VALUES,local_copy);
 67:   DMLocalToLocalEnd(da,local,INSERT_VALUES,local_copy);

 69:   PetscOptionsGetBool(NULL,NULL,"-save",&flg,NULL);
 70:   if (flg) {
 71:     MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 72:     sprintf(filename,"local.%d",rank);
 73:     PetscViewerASCIIOpen(PETSC_COMM_SELF,filename,&viewer);
 74:     PetscViewerASCIIGetPointer(viewer,&file);
 75:     VecView(local,viewer);
 76:     fprintf(file,"Vector with correct ghost points\n");
 77:     VecView(local_copy,viewer);
 78:     PetscViewerDestroy(&viewer);
 79:   }

 81:   VecAXPY(local_copy,-1.0,local);
 82:   VecNorm(local_copy,NORM_MAX,&work);
 83:   MPI_Allreduce(&work,&norm,1,MPIU_REAL,MPIU_MAX,PETSC_COMM_WORLD);
 84:   PetscPrintf(PETSC_COMM_WORLD,"Norm of difference %g should be zero\n",(double)norm);

 86:   VecDestroy(&local_copy);
 87:   VecDestroy(&local);
 88:   VecDestroy(&global);
 89:   DMDestroy(&da);
 90:   PetscFinalize();
 91:   return 0;
 92: }

 94: /*TEST

 96:    test:
 97:       nsize: 8
 98:       args: -dof 3 -stencil_width 2 -M 50 -N 50 -periodic

100:    test:
101:       suffix: 2
102:       nsize: 8
103:       args: -dof 3 -stencil_width 2 -M 50 -N 50 -periodic -grid2d
104:       output_file: output/ex7_1.out

106:    test:
107:       suffix: 3
108:       nsize: 8
109:       args: -dof 3 -stencil_width 2 -M 50 -N 50 -periodic -grid3d
110:       output_file: output/ex7_1.out

112: TEST*/