1 2 static char help[] = "Tests DMGlobalToLocal() for 3d DA with stencil width of 2.\n\n"; 3 4 #include <petscdm.h> 5 #include <petscdmda.h> 6 7 int main(int argc,char **argv) 8 { 9 PetscInt N = 3,M=2,P=4,dof=1,rstart,rend,i; 10 PetscInt stencil_width = 2; 11 PetscMPIInt rank; 12 DMBoundaryType bx = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE,bz = DM_BOUNDARY_NONE; 13 DMDAStencilType stencil_type = DMDA_STENCIL_STAR; 14 DM da; 15 Vec global,local; 16 17 PetscCall(PetscInitialize(&argc,&argv,(char*)0,help)); 18 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 19 PetscCall(PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL)); 20 PetscCall(PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL)); 21 PetscCall(PetscOptionsGetInt(NULL,NULL,"-P",&P,NULL)); 22 PetscCall(PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL)); 23 PetscCall(PetscOptionsGetInt(NULL,NULL,"-stencil_width",&stencil_width,NULL)); 24 PetscCall(PetscOptionsGetInt(NULL,NULL,"-stencil_type",(PetscInt*)&stencil_type,NULL)); 25 26 PetscCall(DMDACreate3d(PETSC_COMM_WORLD,bx,by,bz,stencil_type,M,N,P,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,dof,stencil_width,0,0,0,&da)); 27 PetscCall(DMSetFromOptions(da)); 28 PetscCall(DMSetUp(da)); 29 PetscCall(DMCreateGlobalVector(da,&global)); 30 PetscCall(VecGetOwnershipRange(global,&rstart,&rend)); 31 for (i=rstart; i<rend; i++) PetscCall(VecSetValue(global,i,(PetscReal)(i + 100*rank),INSERT_VALUES)); 32 PetscCall(VecAssemblyBegin(global)); 33 PetscCall(VecAssemblyEnd(global)); 34 PetscCall(DMCreateLocalVector(da,&local)); 35 PetscCall(VecSet(local,-1)); 36 PetscCall(DMGlobalToLocalBegin(da,global,INSERT_VALUES,local)); 37 PetscCall(DMGlobalToLocalEnd(da,global,INSERT_VALUES,local)); 38 if (rank == 0) PetscCall(VecView(local,0)); 39 PetscCall(DMDestroy(&da)); 40 PetscCall(VecDestroy(&local)); 41 PetscCall(VecDestroy(&global)); 42 PetscCall(PetscFinalize()); 43 return 0; 44 } 45