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 PetscErrorCode ierr; 12 PetscMPIInt rank; 13 DMBoundaryType bx = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE,bz = DM_BOUNDARY_NONE; 14 DMDAStencilType stencil_type = DMDA_STENCIL_STAR; 15 DM da; 16 Vec global,local; 17 18 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 19 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRMPI(ierr); 20 ierr = PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);CHKERRQ(ierr); 21 ierr = PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);CHKERRQ(ierr); 22 ierr = PetscOptionsGetInt(NULL,NULL,"-P",&P,NULL);CHKERRQ(ierr); 23 ierr = PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL);CHKERRQ(ierr); 24 ierr = PetscOptionsGetInt(NULL,NULL,"-stencil_width",&stencil_width,NULL);CHKERRQ(ierr); 25 ierr = PetscOptionsGetInt(NULL,NULL,"-stencil_type",(PetscInt*)&stencil_type,NULL);CHKERRQ(ierr); 26 27 ierr = 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);CHKERRQ(ierr); 28 ierr = DMSetFromOptions(da);CHKERRQ(ierr); 29 ierr = DMSetUp(da);CHKERRQ(ierr); 30 ierr = DMCreateGlobalVector(da,&global);CHKERRQ(ierr); 31 ierr = VecGetOwnershipRange(global,&rstart,&rend);CHKERRQ(ierr); 32 for (i=rstart; i<rend; i++) {ierr = VecSetValue(global,i,(PetscReal)(i + 100*rank),INSERT_VALUES);CHKERRQ(ierr);} 33 ierr = VecAssemblyBegin(global);CHKERRQ(ierr); 34 ierr = VecAssemblyEnd(global);CHKERRQ(ierr); 35 ierr = DMCreateLocalVector(da,&local);CHKERRQ(ierr); 36 ierr = VecSet(local,-1);CHKERRQ(ierr); 37 ierr = DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 38 ierr = DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);CHKERRQ(ierr); 39 if (rank == 0) {ierr = VecView(local,0);CHKERRQ(ierr);} 40 ierr = DMDestroy(&da);CHKERRQ(ierr); 41 ierr = VecDestroy(&local);CHKERRQ(ierr); 42 ierr = VecDestroy(&global);CHKERRQ(ierr); 43 ierr = PetscFinalize(); 44 return ierr; 45 } 46