1 2 /* 3 Code for manipulating distributed regular arrays in parallel. 4 */ 5 6 #include <petsc/private/dmdaimpl.h> /*I "petscdmda.h" I*/ 7 8 PetscErrorCode VecDuplicate_MPI_DA(Vec g,Vec *gg) 9 { 10 PetscErrorCode ierr; 11 DM da; 12 PetscLayout map; 13 14 PetscFunctionBegin; 15 ierr = VecGetDM(g, &da);CHKERRQ(ierr); 16 ierr = DMCreateGlobalVector(da,gg);CHKERRQ(ierr); 17 ierr = VecGetLayout(g,&map);CHKERRQ(ierr); 18 ierr = VecSetLayout(*gg,map);CHKERRQ(ierr); 19 PetscFunctionReturn(0); 20 } 21 22 PetscErrorCode DMCreateGlobalVector_DA(DM da,Vec *g) 23 { 24 PetscErrorCode ierr; 25 DM_DA *dd = (DM_DA*)da->data; 26 27 PetscFunctionBegin; 28 PetscValidHeaderSpecific(da,DM_CLASSID,1); 29 PetscValidPointer(g,2); 30 ierr = VecCreate(PetscObjectComm((PetscObject)da),g);CHKERRQ(ierr); 31 ierr = VecSetSizes(*g,dd->Nlocal,PETSC_DETERMINE);CHKERRQ(ierr); 32 ierr = VecSetBlockSize(*g,dd->w);CHKERRQ(ierr); 33 ierr = VecSetType(*g,da->vectype);CHKERRQ(ierr); 34 if (dd->Nlocal < da->bind_below) { 35 ierr = VecSetBindingPropagates(*g,PETSC_TRUE);CHKERRQ(ierr); 36 ierr = VecBindToCPU(*g,PETSC_TRUE);CHKERRQ(ierr); 37 } 38 ierr = VecSetDM(*g, da);CHKERRQ(ierr); 39 ierr = VecSetLocalToGlobalMapping(*g,da->ltogmap);CHKERRQ(ierr); 40 ierr = VecSetOperation(*g,VECOP_VIEW,(void (*)(void))VecView_MPI_DA);CHKERRQ(ierr); 41 ierr = VecSetOperation(*g,VECOP_LOAD,(void (*)(void))VecLoad_Default_DA);CHKERRQ(ierr); 42 ierr = VecSetOperation(*g,VECOP_DUPLICATE,(void (*)(void))VecDuplicate_MPI_DA);CHKERRQ(ierr); 43 PetscFunctionReturn(0); 44 } 45 46 /*@ 47 DMDACreateNaturalVector - Creates a parallel PETSc vector that 48 will hold vector values in the natural numbering, rather than in 49 the PETSc parallel numbering associated with the DMDA. 50 51 Collective 52 53 Input Parameter: 54 . da - the distributed array 55 56 Output Parameter: 57 . g - the distributed global vector 58 59 Level: developer 60 61 Note: 62 The output parameter, g, is a regular PETSc vector that should be destroyed 63 with a call to VecDestroy() when usage is finished. 64 65 The number of local entries in the vector on each process is the same 66 as in a vector created with DMCreateGlobalVector(). 67 68 .seealso: DMCreateLocalVector(), VecDuplicate(), VecDuplicateVecs(), 69 DMDACreate1d(), DMDACreate2d(), DMDACreate3d(), DMGlobalToLocalBegin(), 70 DMGlobalToLocalEnd(), DMLocalToGlobalBegin() 71 @*/ 72 PetscErrorCode DMDACreateNaturalVector(DM da,Vec *g) 73 { 74 PetscErrorCode ierr; 75 PetscInt cnt; 76 DM_DA *dd = (DM_DA*)da->data; 77 78 PetscFunctionBegin; 79 PetscValidHeaderSpecificType(da,DM_CLASSID,1,DMDA); 80 PetscValidPointer(g,2); 81 if (dd->natural) { 82 ierr = PetscObjectGetReference((PetscObject)dd->natural,&cnt);CHKERRQ(ierr); 83 if (cnt == 1) { /* object is not currently used by anyone */ 84 ierr = PetscObjectReference((PetscObject)dd->natural);CHKERRQ(ierr); 85 *g = dd->natural; 86 } else { 87 ierr = VecDuplicate(dd->natural,g);CHKERRQ(ierr); 88 } 89 } else { /* create the first version of this guy */ 90 ierr = VecCreate(PetscObjectComm((PetscObject)da),g);CHKERRQ(ierr); 91 ierr = VecSetSizes(*g,dd->Nlocal,PETSC_DETERMINE);CHKERRQ(ierr); 92 ierr = VecSetBlockSize(*g, dd->w);CHKERRQ(ierr); 93 ierr = VecSetType(*g,da->vectype);CHKERRQ(ierr); 94 ierr = PetscObjectReference((PetscObject)*g);CHKERRQ(ierr); 95 96 dd->natural = *g; 97 } 98 PetscFunctionReturn(0); 99 } 100 101