/*----------------------------------------------------------------------*
| apply multigrid linear preconditioner (private) m.gee 03/06|
*----------------------------------------------------------------------*/
int MOERTEL::Mortar_ML_Preconditioner::MultiLevelSA(
const MultiVector& b1_f,
const MultiVector& b2_f,
MultiVector& x1_f,
MultiVector& x2_f,
int level) const
{
MultiVector r1_f(b1_f.GetVectorSpace(),1,false);
MultiVector z1_f(b1_f.GetVectorSpace(),1,false);
// presmoothing
x1_f = 0;
G_.Apply(b1_f,x1_f);
x2_f = mlapiMT_ * x1_f;
x2_f.Scale(-1.0);
// compute residual
r1_f = b1_f - mlapiAhat11_ * x1_f;
// postsmoothing
z1_f = 0;
G_.Apply(r1_f,z1_f);
x1_f = x1_f + z1_f;
x2_f = mlapiMT_ * x1_f;
x2_f.Scale(-1.0);
return 0;
}
// ======================================================================
Operator GetPtent1D(const MultiVector& D, const int offset = 0)
{
if (D.GetNumVectors() != 1)
ML_THROW("D.GetNumVectors() != 1", -1);
int size = D.GetMyLength();
if (size == 0)
ML_THROW("empty diagonal vector in input", -1);
double* diag = new double[size];
for (int i = 0 ; i < size ; ++i)
diag[i] = D(i);
// creates the ML operator and store the diag pointer,
// as well as the function pointers
ML_Operator* MLDiag = ML_Operator_Create(GetML_Comm());
int invec_leng = size / 3 + size % 3;
int outvec_leng = size;
MLDiag->invec_leng = invec_leng;
MLDiag->outvec_leng = outvec_leng;
MLDiag->data = (void*)diag;
MLDiag->data_destroy = Ptent1D_destroy;
MLDiag->matvec->func_ptr = Ptent1D_matvec;
MLDiag->matvec->ML_id = ML_NONEMPTY;
MLDiag->matvec->Nrows = outvec_leng;
MLDiag->from_an_ml_operator = 0;
MLDiag->getrow->func_ptr = Ptent1D_getrows;
MLDiag->getrow->ML_id = ML_NONEMPTY;
MLDiag->getrow->Nrows = outvec_leng;
// creates the domain space
vector<int> MyGlobalElements(invec_leng);
for (int i = 0 ; i < invec_leng ; ++i)
MyGlobalElements[i] = D.GetVectorSpace()(i * 3) / 3;
Space DomainSpace(invec_leng, -1, &MyGlobalElements[0]);
Space RangeSpace = D.GetVectorSpace();
// creates the MLAPI wrapper
Operator Diag(DomainSpace,RangeSpace,MLDiag,true);
return(Diag);
}
int
InverseOperator::Apply(const MultiVector& x, MultiVector& y) const
{
ResetTimer();
StackPush();
if (GetDomainSpace() != x.GetVectorSpace())
ML_THROW("DomainSpace and x.GetVectorSpace() differ", -1);
if (GetRangeSpace() != y.GetVectorSpace())
ML_THROW("RangeSpace and y.GetVectorSpace() differ", -1);
int x_nv = x.GetNumVectors();
int y_nv = y.GetNumVectors();
double FL = 0.0;
if (RCPData_ != Teuchos::null)
FL = RCPData_->ComputeFlops();
if (x_nv != y_nv)
ML_THROW("Number of vectors of x and y differ (" +
GetString(x_nv) + " vs. " + GetString(x_nv), -1);
for (int v = 0 ; v < x_nv ; ++v) {
Epetra_Vector x_Epetra(View,RowMatrix()->OperatorDomainMap(),
(double*)&(x(0,v)));
Epetra_Vector y_Epetra(View,RowMatrix()->OperatorRangeMap(),
(double*)&(y(0,v)));
if (RCPData_ != Teuchos::null)
RCPData_->ApplyInverse(x_Epetra,y_Epetra);
else if (RCPMLPrec_ != Teuchos::null)
RCPMLPrec_->ApplyInverse(x_Epetra,y_Epetra);
else
ML_THROW("Neither Ifpack nor ML smoother is properly set up", -1);
}
StackPop();
if (RCPData_ != Teuchos::null)
UpdateFlops(RCPData_->ComputeFlops() - FL);
UpdateTime();
return(0);
}
// ======================================================================
MultiVector Extract(const MultiVector& y, const int v)
{
if ((v < 0) || v >= y.GetNumVectors())
ML_THROW("Wrong input parameter v (" +
GetString(v) + ")", -1);
MultiVector x(y.GetVectorSpace(), y.GetRCPValues(v));
return(x);
}
MultiVector LoadBalanceInverseOperator::operator()(const MultiVector& LHS)
{
StackPush();
MultiVector RHS(LHS.GetVectorSpace());
RHS = 0.0;
Apply(LHS,RHS);
StackPop();
return(RHS);
}
// ======================================================================
MultiVector Duplicate(const MultiVector& y, const int v)
{
if ((v < 0) || v >= y.GetNumVectors())
ML_THROW("Wrong input parameter v (" +
GetString(v) + ")", -1);
// FIXME: use Extract
MultiVector x(y.GetVectorSpace(), 1);
for (int i = 0 ; i < x.GetMyLength() ; ++i)
x(i) = y(i,v);
return(x);
}
// ======================================================================
Operator GetDiagonal(const MultiVector& D)
{
if (D.GetNumVectors() != 1)
ML_THROW("D.GetNumVectors() != 1", -1);
int size = D.GetMyLength();
if (size == 0)
ML_THROW("empty diagonal vector in input", -1);
double* diag = new double[size];
for (int i = 0 ; i < size ; ++i)
diag[i] = D(i);
// creates the ML operator and store the diag pointer,
// as well as the function pointers
ML_Operator* MLDiag = ML_Operator_Create(GetML_Comm());
MLDiag->invec_leng = size;
MLDiag->outvec_leng = size;
MLDiag->data = (void*)diag;
MLDiag->matvec->func_ptr = diag_matvec;
MLDiag->matvec->ML_id = ML_NONEMPTY;
MLDiag->matvec->Nrows = size;
MLDiag->from_an_ml_operator = 0;
MLDiag->data_destroy = diag_destroy;
MLDiag->getrow->func_ptr = diag_getrows;
MLDiag->getrow->ML_id = ML_NONEMPTY;
MLDiag->getrow->Nrows = size;
// creates the MLAPI wrapper
Operator Diag(D.GetVectorSpace(),D.GetVectorSpace(),MLDiag,true);
return(Diag);
}
/*----------------------------------------------------------------------*
| apply multigrid linear preconditioner (private) m.gee 03/06|
*----------------------------------------------------------------------*/
int MOERTEL::Mortar_ML_Preconditioner::MultiLevelSA(const MultiVector& b_f,
MultiVector& x_f,
int level) const
{
if (level == maxlevels_-1)
{
x_f = 0;
S(level).Apply(b_f,x_f);
x_f = ImWBT(level) * x_f;
return 0;
}
MultiVector r_f(b_f.GetVectorSpace(),1,false);
MultiVector z_f(b_f.GetVectorSpace(),1,false);
MultiVector r_c(P(level).GetDomainSpace(),1,false);
MultiVector z_c(P(level).GetDomainSpace(),1,false);
// presmoothing
x_f = 0;
S(level).Apply(b_f,x_f);
x_f = ImWBT(level) * x_f;
// compute residual (different operator)
r_f = b_f - Ahat(level) * x_f;
// restrict
r_c = R(level) * r_f;
// solve coarser problem
MultiLevelSA(r_c,z_c,level+1);
// prolongate
x_f = x_f + P(level) * z_c;
x_f = ImWBT(level) * x_f;
// recompute residual using a different operator
r_f = b_f - Ahat(level) * x_f;
// postsmoothing
z_f = 0;
S(level).Apply(r_f,z_f);
z_f = ImWBT(level) * z_f;
x_f = x_f + z_f;
return 0;
}
// ======================================================================
MultiVector Duplicate(const MultiVector& y)
{
MultiVector x(y.GetVectorSpace(), y.GetNumVectors());
x.Update(y);
return(x);
}
