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MueLu_AMGXOperator_def.hpp
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46 
47 #ifndef MUELU_AMGXOPERATOR_DEF_HPP
48 #define MUELU_AMGXOPERATOR_DEF_HPP
49 
50 
51 #if defined (HAVE_MUELU_AMGX)
53 
54 namespace MueLu {
55 
56  template<class Node>
59  return domainMap_;
60  }
61 
62  template<class Node>
64  return rangeMap_;
65  }
66 
67  template<class Node>
68  void AMGXOperator<double,int,int,Node>::apply(const Tpetra::MultiVector<double,int,int,Node>& X,
69  Tpetra::MultiVector<double,int,int,Node>& Y,
70  Teuchos::ETransp mode, double alpha, double beta) const {
71  RCP<const Teuchos::Comm<int> > comm = Y.getMap()->getComm();
72 
73  ArrayRCP<const double> mueluXdata, amgxXdata;
74  ArrayRCP<double> mueluYdata, amgxYdata;
75 
76  try {
77  for (int i = 0; i < (int)Y.getNumVectors(); i++) {
78  {
79  vectorTimer1_->start();
80 
81  mueluXdata = X.getData(i);
82  mueluYdata = Y.getDataNonConst(i);
83 
84  if (comm->getSize() == 1) {
85  amgxXdata = mueluXdata;
86  amgxYdata = mueluYdata;
87 
88  } else {
89  int n = mueluXdata.size();
90 
91  amgxXdata.resize(n);
92  amgxYdata.resize(n);
93 
94  ArrayRCP<double> amgxXdata_nonConst = Teuchos::arcp_const_cast<double>(amgxXdata);
95  for (int j = 0; j < n; j++) {
96  amgxXdata_nonConst[muelu2amgx_[j]] = mueluXdata[j];
97  amgxYdata [muelu2amgx_[j]] = mueluYdata[j];
98  }
99  }
100 
101  AMGX_vector_upload(X_, N_, 1, &amgxXdata[0]);
102  AMGX_vector_upload(Y_, N_, 1, &amgxYdata[0]);
103 
104  vectorTimer1_->stop();
105  vectorTimer1_->incrementNumCalls();
106  }
107 
108  AMGX_solver_solve(Solver_, X_, Y_);
109 
110  {
111  vectorTimer2_->start();
112 
113  AMGX_vector_download(Y_, &amgxYdata[0]);
114 
115  if (comm->getSize() > 1) {
116  int n = mueluYdata.size();
117 
118  for (int j = 0; j < n; j++)
119  mueluYdata[j] = amgxYdata[muelu2amgx_[j]];
120  }
121 
122  vectorTimer2_->stop();
123  vectorTimer2_->incrementNumCalls();
124  }
125  }
126 
127  } catch (std::exception& e) {
128  std::string errMsg = std::string("Caught an exception in MueLu::AMGXOperator::Apply():\n") + e.what() + "\n";
129  throw Exceptions::RuntimeError(errMsg);
130  }
131  }
132 
133  template<class Node>
135  return false;
136  }
137 
138 } // namespace
139 #endif //if defined(HAVE_MUELU_AMGX)
140 
141 #endif //ifdef MUELU_AMGXOPERATOR_DEF_HPP
bool hasTransposeApply() const
Indicates whether this operator supports applying the adjoint operator.
size_type size() const
Teuchos::RCP< const Map > getDomainMap() const
Returns the Tpetra::Map object associated with the domain of this operator.
Namespace for MueLu classes and methods.
void resize(const size_type n, const T &val=T())
Teuchos::RCP< const Map > getRangeMap() const
Returns the Tpetra::Map object associated with the range of this operator.
void apply(const MultiVector &X, MultiVector &Y, Teuchos::ETransp mode=Teuchos::NO_TRANS, Scalar alpha=Teuchos::ScalarTraits< Scalar >::one(), Scalar beta=Teuchos::ScalarTraits< Scalar >::zero()) const
Returns a solution for the linear system AX=Y in the Tpetra::MultiVector X.
Exception throws to report errors in the internal logical of the program.