Amesos_Umfpack.h

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// 
//                Amesos: Direct Sparse Solver Package
//                 Copyright (2004) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
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#ifndef AMESOS_UMFPACK_H
#define AMESOS_UMFPACK_H

#include "Amesos_ConfigDefs.h"
#include "Amesos_BaseSolver.h"
#include "Amesos_BaseSolver.h"
#include "Amesos_NoCopiable.h"
#include "Amesos_Utils.h"
#include "Amesos_Time.h"
#include "Amesos_Status.h"
#include "Amesos_Control.h"
#include "Epetra_CrsMatrix.h"
#include "Epetra_LinearProblem.h"
#include "Epetra_Time.h"
#include "Epetra_Import.h"
#include "Teuchos_RCP.hpp"
#ifdef EPETRA_MPI
#include "Epetra_MpiComm.h"
#else
#include "Epetra_Comm.h"
#endif


class Amesos_Umfpack: public Amesos_BaseSolver,  
                      private Amesos_Time, 
                      private Amesos_NoCopiable, 
                      private Amesos_Utils, 
                      private Amesos_Control, 
                      private Amesos_Status 
{ 
public: 


  Amesos_Umfpack( const Epetra_LinearProblem& LinearProblem );


  ~Amesos_Umfpack(void);



  int SymbolicFactorization();

  int NumericFactorization();

  int Solve();



  const Epetra_LinearProblem *GetProblem() const { return(Problem_); };


  bool MatrixShapeOK() const ;

  int SetUseTranspose(bool UseTranspose_in) {UseTranspose_ = UseTranspose_in; return(0);};

  bool UseTranspose() const {return(UseTranspose_);};

  const Epetra_Comm & Comm() const {return(GetProblem()->GetOperator()->Comm());};

  /*  Rcond is an estimate of the reciprocal of the condition number of the 
      matrix at the time of the most recent call to NumericFactorization()
      Rcond = min(abs(diag))/max(abs(diag)) see Umfpack documentatoin
      for details.  
   */
  double GetRcond() const ; 

  int SetParameters( Teuchos::ParameterList &ParameterList ) ;

  int NumSymbolicFact() const { return( Amesos_Status::NumSymbolicFact_ ); }

  int NumNumericFact() const { return( Amesos_Status::NumNumericFact_ ); }

  int NumSolve() const { return( Amesos_Status::NumSolve_ ); }

  void PrintTiming() const;
  
  void PrintStatus() const;

  void GetTiming( Teuchos::ParameterList &TimingParameterList ) const { Amesos_Time::GetTiming(TimingParameterList); }

private:  
  

  
  Epetra_RowMatrix* Matrix()
  {
    return(dynamic_cast<Epetra_RowMatrix *>(Problem_->GetOperator()));
  }

  int ConvertToSerial(const bool FirstTime);

  /*
    ConvertToUmfpackCRS - Convert matirx to form expected by Umfpack: Ai, Ap, Aval
    Preconditions:
      numentries_, NumGloalElements_ and SerialMatrix_ must be set.
    Postconditions:
      Ai, Ap, and Aval are resized and populated with a compresses row storage 
      version of the input matrix A.
  */
  int ConvertToUmfpackCRS();     

  /*
    PerformSymbolicFactorization - Call Umfpack to perform symbolic factorization
    Preconditions:
      IsLocal must be set to 1 if the input matrix is entirely stored on process 0
      Ap, Ai and Aval are a compressed row storage version of the input matrix A.
    Postconditions:
      Symbolic points to an UMFPACK internal opaque object containing the
        symbolic factorization and accompanying information.  
      SymbolicFactorizationOK_ = true; 
    Note:  All action is performed on process 0
  */
      
  int PerformSymbolicFactorization(); 

  /*
    PerformNumericFactorization - Call Umfpack to perform numeric factorization
    Preconditions:
      IsLocal must be set 
      Ap, Ai and Aval are a compressed row storage version of the input matrix A.
      Symbolic must be set
    Postconditions:
      Numeric points to an UMFPACK internal opaque object containing the
        numeric factorization and accompanying information.  
      NumericFactorizationOK_ = true; 
    Note:  All action is performed on process 0
  */
  int PerformNumericFactorization(); 

  inline const Epetra_Import& Importer() const
  {
    return(*(ImportToSerial_.get()));
  }

  inline const Epetra_Map& SerialMap() const
  {
    return(*(SerialMap_.get()));
  }

  inline const Epetra_CrsMatrix& SerialCrsMatrix() const
  {
    return(*(SerialCrsMatrixA_.get()));
  }

  inline Epetra_CrsMatrix& SerialCrsMatrix()
  {
    return(*(SerialCrsMatrixA_.get()));
  }

  // @}
  
  void *Symbolic;
  void *Numeric;

  std::vector <int> Ap;
  std::vector <int> Ai;
  std::vector <double> Aval;

  int IsLocal_;
  int numentries_;
  int NumGlobalElements_;

  Teuchos::RCP<Epetra_Map> SerialMap_;
  /* If IsLocal==1 - Points to the original matrix 
   * If  IsLocal==0 - Points to SerialCrsMatrixA
   */
  Epetra_RowMatrix* SerialMatrix_;

  Teuchos::RCP<Epetra_CrsMatrix> SerialCrsMatrixA_;

  bool UseTranspose_;
  const Epetra_LinearProblem * Problem_;
  mutable double Rcond_;
  //  True if Rcond_ is the same on all processes
  mutable bool RcondValidOnAllProcs_;
  Teuchos::RCP<Epetra_Import> ImportToSerial_;

  int MtxConvTime_, MtxRedistTime_, VecRedistTime_;
  int SymFactTime_, NumFactTime_, SolveTime_, OverheadTime_;
  
};  // class Amesos_Umfpack  
#endif /* AMESOS_UMFPACK_H */