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 CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 20 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL)); 21 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL)); 22 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-P",&P,NULL)); 23 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL)); 24 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-stencil_width",&stencil_width,NULL)); 25 CHKERRQ(PetscOptionsGetInt(NULL,NULL,"-stencil_type",(PetscInt*)&stencil_type,NULL)); 26 27 CHKERRQ(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)); 28 CHKERRQ(DMSetFromOptions(da)); 29 CHKERRQ(DMSetUp(da)); 30 CHKERRQ(DMCreateGlobalVector(da,&global)); 31 CHKERRQ(VecGetOwnershipRange(global,&rstart,&rend)); 32 for (i=rstart; i<rend; i++) CHKERRQ(VecSetValue(global,i,(PetscReal)(i + 100*rank),INSERT_VALUES)); 33 CHKERRQ(VecAssemblyBegin(global)); 34 CHKERRQ(VecAssemblyEnd(global)); 35 CHKERRQ(DMCreateLocalVector(da,&local)); 36 CHKERRQ(VecSet(local,-1)); 37 CHKERRQ(DMGlobalToLocalBegin(da,global,INSERT_VALUES,local)); 38 CHKERRQ(DMGlobalToLocalEnd(da,global,INSERT_VALUES,local)); 39 if (rank == 0) CHKERRQ(VecView(local,0)); 40 CHKERRQ(DMDestroy(&da)); 41 CHKERRQ(VecDestroy(&local)); 42 CHKERRQ(VecDestroy(&global)); 43 ierr = PetscFinalize(); 44 return ierr; 45 } 46