Actual source code: ex7.c

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

 4:  #include petscda.h
 5:  #include petscsys.h

  9: int main(int argc,char **argv)
 10: {
 11:   PetscMPIInt    rank;
 12:   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;
 14:   PetscTruth     flg,flg2,flg3;
 15:   DAPeriodicType periodic;
 16:   DAStencilType  stencil_type;
 17:   DA             da;
 18:   Vec            local,global,local_copy;
 19:   PetscScalar    value;
 20:   PetscReal      norm,work;
 21:   PetscViewer    viewer;
 22:   char           filename[64];
 23:   FILE           *file;

 25:   PetscInitialize(&argc,&argv,(char*)0,help);

 27:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
 28:   PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
 29:   PetscOptionsGetInt(PETSC_NULL,"-dof",&dof,PETSC_NULL);
 30:   PetscOptionsGetInt(PETSC_NULL,"-stencil_width",&stencil_width,PETSC_NULL);
 31:   PetscOptionsGetInt(PETSC_NULL,"-periodic",&pt,PETSC_NULL);
 32:   periodic = (DAPeriodicType) pt;
 33:   PetscOptionsGetInt(PETSC_NULL,"-stencil_type",&st,PETSC_NULL);
 34:   stencil_type = (DAStencilType) st;

 36:   PetscOptionsHasName(PETSC_NULL,"-2d",&flg2);
 37:   PetscOptionsHasName(PETSC_NULL,"-3d",&flg3);
 38:   if (flg2) {
 39:     DACreate2d(PETSC_COMM_WORLD,periodic,stencil_type,M,N,m,n,dof,stencil_width,
 40:                       PETSC_NULL,PETSC_NULL,&da);
 41:   } else if (flg3) {
 42:     DACreate3d(PETSC_COMM_WORLD,periodic,stencil_type,M,N,P,m,n,p,dof,stencil_width,
 43:                       PETSC_NULL,PETSC_NULL,PETSC_NULL,&da);
 44:   }
 45:   else {
 46:     DACreate1d(PETSC_COMM_WORLD,periodic,M,dof,stencil_width,PETSC_NULL,&da);
 47:   }

 49:   DACreateGlobalVector(da,&global);
 50:   DACreateLocalVector(da,&local);
 51:   VecDuplicate(local,&local_copy);

 53: 
 54:   /* zero out vectors so that ghostpoints are zero */
 55:   value = 0;
 56:   VecSet(local,value);
 57:   VecSet(local_copy,value);

 59:   VecGetOwnershipRange(global,&start,&end);
 60:   for (i=start; i<end; i++) {
 61:     value = i + 1;
 62:     VecSetValues(global,1,&i,&value,INSERT_VALUES);
 63:   }
 64:   VecAssemblyBegin(global);
 65:   VecAssemblyEnd(global);

 67:   DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 68:   DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);


 71:   DALocalToLocalBegin(da,local,INSERT_VALUES,local_copy);
 72:   DALocalToLocalEnd(da,local,INSERT_VALUES,local_copy);

 74:   PetscOptionsHasName(PETSC_NULL,"-save",&flg);
 75:   if (flg) {
 76:     MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 77:     sprintf(filename,"local.%d",rank);
 78:     PetscViewerASCIIOpen(PETSC_COMM_SELF,filename,&viewer);
 79:     PetscViewerASCIIGetPointer(viewer,&file);
 80:     VecView(local,viewer);
 81:     fprintf(file,"Vector with correct ghost points\n");
 82:     VecView(local_copy,viewer);
 83:     PetscViewerDestroy(viewer);
 84:   }

 86:   VecAXPY(local_copy,-1.0,local);
 87:   VecNorm(local_copy,NORM_MAX,&work);
 88:   MPI_Allreduce(&work,&norm,1,MPIU_REAL,MPI_MAX,PETSC_COMM_WORLD);
 89:   PetscPrintf(PETSC_COMM_WORLD,"Norm of difference %G should be zero\n",norm);
 90: 
 91:   VecDestroy(local_copy);
 92:   VecDestroy(local);
 93:   VecDestroy(global);
 94:   DADestroy(da);
 95:   PetscFinalize();
 96:   return 0;
 97: }