PetscErrorCode MatSetLocalToGlobalMapping_IS(Mat A,ISLocalToGlobalMapping rmapping,ISLocalToGlobalMapping cmapping)
{
PetscErrorCode ierr;
PetscInt n,bs;
Mat_IS *is = (Mat_IS*)A->data;
IS from,to;
Vec global;
PetscFunctionBegin;
PetscCheckSameComm(A,1,rmapping,2);
if (rmapping != cmapping) SETERRQ(PetscObjectComm((PetscObject)A),PETSC_ERR_ARG_INCOMP,"MATIS requires the row and column mappings to be identical");
if (is->mapping) { /* Currenly destroys the objects that will be created by this routine. Is there anything else that should be checked? */
ierr = ISLocalToGlobalMappingDestroy(&is->mapping);CHKERRQ(ierr);
ierr = VecDestroy(&is->x);CHKERRQ(ierr);
ierr = VecDestroy(&is->y);CHKERRQ(ierr);
ierr = VecScatterDestroy(&is->ctx);CHKERRQ(ierr);
ierr = MatDestroy(&is->A);CHKERRQ(ierr);
}
ierr = PetscObjectReference((PetscObject)rmapping);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingDestroy(&is->mapping);CHKERRQ(ierr);
is->mapping = rmapping;
/*
ierr = PetscLayoutSetISLocalToGlobalMapping(A->rmap,rmapping);CHKERRQ(ierr);
ierr = PetscLayoutSetISLocalToGlobalMapping(A->cmap,cmapping);CHKERRQ(ierr);
*/
/* Create the local matrix A */
ierr = ISLocalToGlobalMappingGetSize(rmapping,&n);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingGetBlockSize(rmapping,&bs);CHKERRQ(ierr);
ierr = MatCreate(PETSC_COMM_SELF,&is->A);CHKERRQ(ierr);
if (bs > 1) {
ierr = MatSetType(is->A,MATSEQBAIJ);CHKERRQ(ierr);
} else {
ierr = MatSetType(is->A,MATSEQAIJ);CHKERRQ(ierr);
}
ierr = MatSetSizes(is->A,n,n,n,n);CHKERRQ(ierr);
ierr = MatSetBlockSize(is->A,bs);CHKERRQ(ierr);
ierr = MatSetOptionsPrefix(is->A,((PetscObject)A)->prefix);CHKERRQ(ierr);
ierr = MatAppendOptionsPrefix(is->A,"is_");CHKERRQ(ierr);
ierr = MatSetFromOptions(is->A);CHKERRQ(ierr);
/* Create the local work vectors */
ierr = VecCreate(PETSC_COMM_SELF,&is->x);CHKERRQ(ierr);
ierr = VecSetBlockSize(is->x,bs);CHKERRQ(ierr);
ierr = VecSetSizes(is->x,n,n);CHKERRQ(ierr);
ierr = VecSetOptionsPrefix(is->x,((PetscObject)A)->prefix);CHKERRQ(ierr);
ierr = VecAppendOptionsPrefix(is->x,"is_");CHKERRQ(ierr);
ierr = VecSetFromOptions(is->x);CHKERRQ(ierr);
ierr = VecDuplicate(is->x,&is->y);CHKERRQ(ierr);
/* setup the global to local scatter */
ierr = ISCreateStride(PETSC_COMM_SELF,n,0,1,&to);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingApplyIS(rmapping,to,&from);CHKERRQ(ierr);
ierr = MatCreateVecs(A,&global,NULL);CHKERRQ(ierr);
ierr = VecScatterCreate(global,from,is->x,to,&is->ctx);CHKERRQ(ierr);
ierr = VecDestroy(&global);CHKERRQ(ierr);
ierr = ISDestroy(&to);CHKERRQ(ierr);
ierr = ISDestroy(&from);CHKERRQ(ierr);
PetscFunctionReturn(0);
}
/*@
PetscLayoutSetISLocalToGlobalMapping - sets a ISLocalGlobalMapping into a PetscLayout
Collective on PetscLayout
Input Parameter:
+ in - input PetscLayout
- ltog - the local to global mapping
Level: developer
Notes: PetscLayoutSetUp() does not need to be called on the resulting PetscLayout
If the ltog location already contains a PetscLayout it is destroyed
.seealso: PetscLayoutCreate(), PetscLayoutDestroy(), PetscLayoutSetUp(), PetscLayoutDuplicate()
@*/
PetscErrorCode PetscLayoutSetISLocalToGlobalMapping(PetscLayout in,ISLocalToGlobalMapping ltog)
{
PetscErrorCode ierr;
PetscInt bs;
PetscFunctionBegin;
ierr = ISLocalToGlobalMappingGetBlockSize(ltog,&bs);CHKERRQ(ierr);
if (in->bs > 0 && in->bs != bs) SETERRQ2(in->comm,PETSC_ERR_PLIB,"Blocksize of layout %D must match that of mapping %D",in->bs,bs);
ierr = PetscObjectReference((PetscObject)ltog);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingDestroy(&in->mapping);CHKERRQ(ierr);
in->mapping = ltog;
PetscFunctionReturn(0);
}
/*@
PetscLayoutSetBlockSize - Sets the block size for a PetscLayout object.
Logically Collective on PetscLayout
Input Parameters:
+ map - pointer to the map
- bs - the size
Level: developer
Notes:
Call this after the call to PetscLayoutCreate()
.seealso: PetscLayoutCreate(), PetscLayoutSetLocalSize(), PetscLayoutGetLocalSize(), PetscLayoutGetBlockSize(),
PetscLayoutGetRange(), PetscLayoutGetRanges(), PetscLayoutSetSize(), PetscLayoutGetSize(), PetscLayoutSetUp()
@*/
PetscErrorCode PetscLayoutSetBlockSize(PetscLayout map,PetscInt bs)
{
PetscFunctionBegin;
if (bs < 0) PetscFunctionReturn(0);
if (map->n > 0 && map->n % bs) SETERRQ2(map->comm,PETSC_ERR_ARG_INCOMP,"Local size %D not compatible with block size %D",map->n,bs);
if (map->range && map->bs > 0 && map->bs != bs) SETERRQ2(map->comm,PETSC_ERR_ARG_INCOMP,"Cannot change block size %D to %D",map->bs,bs);
if (map->mapping) {
PetscInt lbs;
PetscErrorCode ierr;
ierr = ISLocalToGlobalMappingGetBlockSize(map->mapping,&lbs);CHKERRQ(ierr);
if (lbs != bs) SETERRQ2(map->comm,PETSC_ERR_PLIB,"Blocksize of localtoglobalmapping %D must match that of layout %D",lbs,bs);
}
map->bs = bs;
PetscFunctionReturn(0);
}
/* Compose an IS with an ISLocalToGlobalMapping to map from IS source indices to global indices */
static PetscErrorCode ISL2GCompose(IS is,ISLocalToGlobalMapping ltog,ISLocalToGlobalMapping *cltog)
{
PetscErrorCode ierr;
const PetscInt *idx;
PetscInt m,*idxm;
PetscBool isblock;
PetscFunctionBegin;
PetscValidHeaderSpecific(is,IS_CLASSID,1);
PetscValidHeaderSpecific(ltog,IS_LTOGM_CLASSID,2);
PetscValidPointer(cltog,3);
ierr = PetscObjectTypeCompare((PetscObject)is,ISBLOCK,&isblock);CHKERRQ(ierr);
if (isblock) {
PetscInt bs,lbs;
ierr = ISGetBlockSize(is,&bs);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingGetBlockSize(ltog,&lbs);CHKERRQ(ierr);
if (bs == lbs) {
ierr = ISGetLocalSize(is,&m);CHKERRQ(ierr);
m = m/bs;
ierr = ISBlockGetIndices(is,&idx);CHKERRQ(ierr);
ierr = PetscMalloc1(m,&idxm);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingApplyBlock(ltog,m,idx,idxm);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingCreate(PetscObjectComm((PetscObject)is),bs,m,idxm,PETSC_OWN_POINTER,cltog);CHKERRQ(ierr);
ierr = ISBlockRestoreIndices(is,&idx);CHKERRQ(ierr);
PetscFunctionReturn(0);
}
}
ierr = ISGetLocalSize(is,&m);CHKERRQ(ierr);
ierr = ISGetIndices(is,&idx);CHKERRQ(ierr);
ierr = PetscMalloc1(m,&idxm);CHKERRQ(ierr);
if (ltog) {
ierr = ISLocalToGlobalMappingApply(ltog,m,idx,idxm);CHKERRQ(ierr);
} else {
ierr = PetscMemcpy(idxm,idx,m*sizeof(PetscInt));CHKERRQ(ierr);
}
ierr = ISLocalToGlobalMappingCreate(PetscObjectComm((PetscObject)is),1,m,idxm,PETSC_OWN_POINTER,cltog);CHKERRQ(ierr);
ierr = ISRestoreIndices(is,&idx);CHKERRQ(ierr);
PetscFunctionReturn(0);
}
PetscErrorCode MatSetLocalToGlobalMapping_IS(Mat A,ISLocalToGlobalMapping rmapping,ISLocalToGlobalMapping cmapping)
{
PetscErrorCode ierr;
PetscInt nr,rbs,nc,cbs;
Mat_IS *is = (Mat_IS*)A->data;
IS from,to;
Vec cglobal,rglobal;
PetscFunctionBegin;
PetscCheckSameComm(A,1,rmapping,2);
PetscCheckSameComm(A,1,cmapping,3);
/* Destroy any previous data */
ierr = VecDestroy(&is->x);CHKERRQ(ierr);
ierr = VecDestroy(&is->y);CHKERRQ(ierr);
ierr = VecScatterDestroy(&is->rctx);CHKERRQ(ierr);
ierr = VecScatterDestroy(&is->cctx);CHKERRQ(ierr);
ierr = MatDestroy(&is->A);CHKERRQ(ierr);
ierr = PetscSFDestroy(&is->sf);CHKERRQ(ierr);
ierr = PetscFree2(is->sf_rootdata,is->sf_leafdata);CHKERRQ(ierr);
/* Setup Layout and set local to global maps */
ierr = PetscLayoutSetUp(A->rmap);CHKERRQ(ierr);
ierr = PetscLayoutSetUp(A->cmap);CHKERRQ(ierr);
ierr = PetscLayoutSetISLocalToGlobalMapping(A->rmap,rmapping);CHKERRQ(ierr);
ierr = PetscLayoutSetISLocalToGlobalMapping(A->cmap,cmapping);CHKERRQ(ierr);
/* Create the local matrix A */
ierr = ISLocalToGlobalMappingGetSize(rmapping,&nr);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingGetBlockSize(rmapping,&rbs);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingGetSize(cmapping,&nc);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingGetBlockSize(cmapping,&cbs);CHKERRQ(ierr);
ierr = MatCreate(PETSC_COMM_SELF,&is->A);CHKERRQ(ierr);
ierr = MatSetType(is->A,MATAIJ);CHKERRQ(ierr);
ierr = MatSetSizes(is->A,nr,nc,nr,nc);CHKERRQ(ierr);
ierr = MatSetBlockSizes(is->A,rbs,cbs);CHKERRQ(ierr);
ierr = MatSetOptionsPrefix(is->A,((PetscObject)A)->prefix);CHKERRQ(ierr);
ierr = MatAppendOptionsPrefix(is->A,"is_");CHKERRQ(ierr);
ierr = MatSetFromOptions(is->A);CHKERRQ(ierr);
/* Create the local work vectors */
ierr = MatCreateVecs(is->A,&is->x,&is->y);CHKERRQ(ierr);
/* setup the global to local scatters */
ierr = MatCreateVecs(A,&cglobal,&rglobal);CHKERRQ(ierr);
ierr = ISCreateStride(PETSC_COMM_SELF,nr,0,1,&to);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingApplyIS(rmapping,to,&from);CHKERRQ(ierr);
ierr = VecScatterCreate(rglobal,from,is->y,to,&is->rctx);CHKERRQ(ierr);
if (rmapping != cmapping) {
ierr = ISDestroy(&to);CHKERRQ(ierr);
ierr = ISDestroy(&from);CHKERRQ(ierr);
ierr = ISCreateStride(PETSC_COMM_SELF,nc,0,1,&to);CHKERRQ(ierr);
ierr = ISLocalToGlobalMappingApplyIS(cmapping,to,&from);CHKERRQ(ierr);
ierr = VecScatterCreate(cglobal,from,is->x,to,&is->cctx);CHKERRQ(ierr);
} else {
ierr = PetscObjectReference((PetscObject)is->rctx);CHKERRQ(ierr);
is->cctx = is->rctx;
}
ierr = VecDestroy(&rglobal);CHKERRQ(ierr);
ierr = VecDestroy(&cglobal);CHKERRQ(ierr);
ierr = ISDestroy(&to);CHKERRQ(ierr);
ierr = ISDestroy(&from);CHKERRQ(ierr);
PetscFunctionReturn(0);
}