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