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