Ifpack_HIPS.cpp

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//       Ifpack: Object-Oriented Algebraic Preconditioner Package
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#include "Ifpack_HIPS.h"
#if defined(HAVE_IFPACK_HIPS) && defined(HAVE_MPI)


#include "Ifpack_Utils.h"
extern "C" {
#include "hips.h"
}
//#include "io.h"
#include "Epetra_MpiComm.h"
#include "Epetra_IntVector.h"
#include "Epetra_Import.h"
#include "Teuchos_ParameterList.hpp"
#include "Teuchos_RefCountPtr.hpp"
#ifdef IFPACK_NODE_AWARE_CODE
extern int ML_NODE_ID;
#endif

using Teuchos::RefCountPtr;
using Teuchos::rcp;



Ifpack_HIPS::Ifpack_HIPS(Epetra_RowMatrix* A):
  A_(rcp(A,false)),
  HIPS_id(-1), // Assumes user will initialze HIPS outside
  IsParallel_(false),
  IsInitialized_(false),
  IsComputed_(false),
  Label_(),
  Time_(A_->Comm())
{

}

void Ifpack_HIPS::Destroy(){
  //NTS: Assume user will call HIPS_Finalize elsewhere - HIPS_Clean never needs
  //to be called if HIPS_Finalize is called at the end, unless you want to reuse
  //a slot.
}



int Ifpack_HIPS::Initialize(){
  if(Comm().NumProc() != 1) IsParallel_ = true;
  else IsParallel_ = false;
  IsInitialized_=true;
  return 0;
}

int Ifpack_HIPS::SetParameters(Teuchos::ParameterList& parameterlist){
  List_=parameterlist;

  // Grab the hips ID
  HIPS_id=List_.get("hips: id",-1);
  if(HIPS_id==-1) IFPACK_CHK_ERR(-1);

  // Set Defaults
  HIPS_SetDefaultOptions(HIPS_id,List_.get("hips: strategy",HIPS_ITERATIVE));

  // Set the communicator
  const Epetra_MpiComm* MpiComm=dynamic_cast<const Epetra_MpiComm*>(&A_->Comm());
  if(!MpiComm) IFPACK_CHK_ERR(-2);
  HIPS_SetCommunicator(HIPS_id,MpiComm->GetMpiComm());

  // Options
  HIPS_SetOptionINT(HIPS_id,HIPS_SYMMETRIC,List_.get("hips: symmetric",0));
  HIPS_SetOptionINT(HIPS_id,HIPS_VERBOSE,List_.get("hips: setup output",1));
  HIPS_SetOptionINT(HIPS_id,HIPS_LOCALLY,List_.get("hips: fill",0));
  // Sadly, this fill option doesn't work for HIPS_ITERATIVE mode, meaning the
  // only way to control fill-in is via the drop tolerance.

  HIPS_SetOptionINT(HIPS_id,HIPS_REORDER,List_.get("hips: reorder",1));
  HIPS_SetOptionINT(HIPS_id,HIPS_GRAPH_SYM,List_.get("hips: graph symmetric",0));
  HIPS_SetOptionINT(HIPS_id,HIPS_FORTRAN_NUMBERING,List_.get("hips: fortran numbering",0));
  HIPS_SetOptionINT(HIPS_id,HIPS_DOF,List_.get("hips: dof per node",1));

  // This will disable the GMRES wrap around HIPS.
  //  HIPS_SetOptionINT(HIPS_id,HIPS_ITMAX,1);
  HIPS_SetOptionINT(HIPS_id,HIPS_ITMAX,-1);
  //  HIPS_SetOptionINT(HIPS_id,HIPS_KRYLOV_METHOD,List_.get("hips: krylov",0));
  HIPS_SetOptionINT(HIPS_id,HIPS_KRYLOV_RESTART,-1);

  // Make sure the ILU always runs, by setting the internal tolerance really, really low.
  HIPS_SetOptionREAL(HIPS_id,HIPS_PREC,1e-100);

  // Options for Iterative only
  if(List_.get("hips: strategy",HIPS_ITERATIVE)==HIPS_ITERATIVE){
    HIPS_SetOptionREAL(HIPS_id, HIPS_DROPTOL0, List_.get("hips: drop tolerance",1e-2));
    HIPS_SetOptionREAL(HIPS_id, HIPS_DROPTOL1, List_.get("hips: drop tolerance",1e-2));
    HIPS_SetOptionREAL(HIPS_id, HIPS_DROPTOLE, List_.get("hips: drop tolerance",1e-2));
  }
  // NTS: This is only a subset of the actual HIPS options.
  return 0;
}


int Ifpack_HIPS::Compute(){
  if(HIPS_id==-1) IFPACK_CHK_ERR(-1);
  int N=A_->NumMyRows(), nnz=A_->NumMyNonzeros();
  const Epetra_Comm &Comm=A_->Comm();
  int mypid=Comm.MyPID();

  // Pull the column indices, if possible
  int *rowptr,*colind,ierr,maxnr,Nr;
  double *values;
  Epetra_CrsMatrix *Acrs=dynamic_cast<Epetra_CrsMatrix*>(&*A_);
  const Epetra_Map &RowMap=A_->RowMatrixRowMap();
  const Epetra_Map &ColMap=A_->RowMatrixColMap();
  if(Acrs) Acrs->ExtractCrsDataPointers(rowptr,colind,values);
  else{
    maxnr=A_->MaxNumEntries();
    colind=new int[maxnr];
    values=new double[maxnr];
  }

  // Create 0-to-N-1 consistent maps for rows and columns
  RowMap0_=rcp(new Epetra_Map(-1,N,0,Comm));
  Epetra_IntVector RowGIDs(View,RowMap,RowMap0_->MyGlobalElements());
  Epetra_IntVector ColGIDs(ColMap);
  Epetra_Import RowToCol(ColMap,RowMap);
  ColGIDs.Import(RowGIDs,RowToCol,Insert);
  ColMap0_=rcp(new Epetra_Map(-1,ColMap.NumMyElements(),ColGIDs.Values(),0,Comm));

  int *gcolind=0;
  if(Acrs){
    //  Global CIDs
    gcolind=new int[nnz];
    for(int j=0;j<nnz;j++) gcolind[j]=RowMap0_->GID(colind[j]);
    ierr =  HIPS_GraphDistrCSR(HIPS_id,A_->NumGlobalRows(),A_->NumMyRows(),RowMap0_->MyGlobalElements(),
                               rowptr,gcolind);
  }
  else{
    // Do things the hard way
    ierr=HIPS_GraphBegin(HIPS_id,A_->NumGlobalRows(),nnz);
    if(ierr!=HIPS_SUCCESS) IFPACK_CHK_ERR(-2);

    // Graph insert - RM mode
    for(int i=0;i<N;i++){
      A_->ExtractMyRowCopy(i,maxnr,Nr,values,colind);
      for(int j=0;j<Nr;j++){
        ierr=HIPS_GraphEdge(HIPS_id,RowMap0_->GID(i),ColMap0_->GID(colind[j]));
        if(ierr!=HIPS_SUCCESS) IFPACK_CHK_ERR(-3);
      }
    }
    ierr=HIPS_GraphEnd(HIPS_id);
  }
  if(ierr!=HIPS_SUCCESS) IFPACK_CHK_ERR(-4);

  /*Have processor 0 send in the partition*/
  // NTS: This is really, really annoying.  Look at all this import/export
  // stuff.  This is mind-numbingly unnecessary.

  Epetra_Map OnePerProcMap(-1,1,0,Comm);
  Epetra_IntVector RowsPerProc(OnePerProcMap);
  Epetra_IntVector RowGID(View,*RowMap0_,RowMap0_->MyGlobalElements());

  // Get the RPP partial sums
  Comm.ScanSum(&N,&(RowsPerProc[0]),1);

  // Build the maps for xfer to proc 0
  int OPP_els=0,RPP_els=0;
  if(!mypid){OPP_els=Comm.NumProc(); RPP_els=A_->NumGlobalRows();}
  Epetra_Map OPPMap_0(-1,OPP_els,0,Comm);
  Epetra_Map RPPMap_0(-1,RPP_els,0,Comm);
  Epetra_Import OPP_importer(OPPMap_0,OnePerProcMap);
  Epetra_Import RPP_importer(RPPMap_0,*RowMap0_);

  // Pull the vectors to proc 0
  Epetra_IntVector OPP_0(OPPMap_0);
  Epetra_IntVector RPP_0(RPPMap_0);
  OPP_0.Import(RowsPerProc,OPP_importer,Add);
  RPP_0.Import(RowGID,RPP_importer,Add);

  // Setup the partition
  if(!mypid){
    int *mapptr=0;
    mapptr=new int[Comm.NumProc()+1];
    mapptr[0]=0;
    for(int i=0;i<Comm.NumProc();i++)
      mapptr[i+1]=OPP_0[i];

    // Call is only necessary on proc 0
    ierr=HIPS_SetPartition(HIPS_id,A_->Comm().NumProc(),mapptr,RPP_0.Values());
    HIPS_ExitOnError(ierr);
    delete [] mapptr;
  }

  if(Acrs)
    ierr = HIPS_MatrixDistrCSR(HIPS_id,A_->NumMyRows(),RowMap0_->MyGlobalElements(),rowptr,gcolind,values,HIPS_ASSEMBLY_OVW,HIPS_ASSEMBLY_OVW,HIPS_ASSEMBLY_FOOL,0);
  else{
    // Do things the hard way
     ierr = HIPS_AssemblyBegin(HIPS_id, nnz, HIPS_ASSEMBLY_OVW, HIPS_ASSEMBLY_OVW, HIPS_ASSEMBLY_FOOL,0);
     if(ierr!=HIPS_SUCCESS){HIPS_PrintError(ierr);IFPACK_CHK_ERR(-5);}

     // Matrix insert - RM Mode
     for(int i=0;i<N;i++){
       A_->ExtractMyRowCopy(i,maxnr,Nr,values,colind);
       for(int j=0;j<Nr;j++){
         ierr = HIPS_AssemblySetValue(HIPS_id,RowMap0_->GID(i),ColMap0_->GID(colind[j]), values[j]);
         if(ierr!=HIPS_SUCCESS){HIPS_PrintError(ierr);IFPACK_CHK_ERR(-6);}
       }
     }
     ierr = HIPS_AssemblyEnd(HIPS_id);
  }
  if(ierr!=HIPS_SUCCESS){HIPS_PrintError(ierr);IFPACK_CHK_ERR(-7);}

  // Force factorization
  //NTS: This is odd.  There should be a better way to force this to happen.
  double *X=new double[A_->NumMyRows()];
  double *Y=new double[A_->NumMyRows()];
  for(int i=0;i<A_->NumMyRows();i++) X[i]=1.0;

  // Force HIPS to do it's own Import/Export
  ierr=HIPS_SetRHS(HIPS_id,A_->NumMyRows(),RowMap0_->MyGlobalElements(),X,HIPS_ASSEMBLY_OVW,HIPS_ASSEMBLY_OVW,HIPS_ASSEMBLY_FOOL);
  if(ierr!=HIPS_SUCCESS) IFPACK_CHK_ERR(-11);

  ierr=HIPS_GetSolution(HIPS_id,A_->NumMyRows(),RowMap0_->MyGlobalElements(),Y,HIPS_ASSEMBLY_FOOL);
  if(ierr!=HIPS_SUCCESS) {
    HIPS_PrintError(ierr);
    IFPACK_CHK_ERR(-12);
  }

  // Reset output for iteration
  HIPS_SetOptionINT(HIPS_id,HIPS_VERBOSE,List_.get("hips: iteration output",0));

  // Set Label
  int nnzP=0;
  HIPS_GetInfoINT(HIPS_id,HIPS_INFO_NNZ,&nnzP);
  if(nnzP>0) sprintf(Label_,"Ifpack_HIPS [dt=%4.1e fill=%4.2f]",List_.get("hips: drop tolerance",1e-2),(double)nnzP/(double)A_->NumGlobalNonzeros());
  else sprintf(Label_,"Ifpack_HIPS [dt=%4.1e]",List_.get("hips: drop tolerance",1e-2));
  // NTS: fill requires a HIPS debug level of at least 2

  IsComputed_=true;

  // Cleanup
  if(!Acrs){
    delete [] colind;
    delete [] values;
  }
  else
    delete [] gcolind;

  delete [] X;
  delete [] Y;
  return 0;
}




int Ifpack_HIPS::ApplyInverse(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const{
  int rv;
  if (!IsComputed())
    IFPACK_CHK_ERR(-3);

  if (X.NumVectors() != Y.NumVectors())
    IFPACK_CHK_ERR(-2);

  // HAQ: For now
  if(X.NumVectors()!=1) IFPACK_CHK_ERR(-42);

  // Wrapping for X==Y
  Teuchos::RefCountPtr< Epetra_MultiVector > X2;
  if (X.Pointers()[0] == Y.Pointers()[0])
    X2 = Teuchos::rcp( new Epetra_MultiVector(X) );
  else
    X2 = Teuchos::rcp( (Epetra_MultiVector*)&X, false );

  Time_.ResetStartTime();

  // Force HIPS to do it's own Import/Export
  rv=HIPS_SetRHS(HIPS_id,A_->NumMyRows(),RowMap0_->MyGlobalElements(),(*X2)[0],HIPS_ASSEMBLY_OVW,HIPS_ASSEMBLY_OVW,HIPS_ASSEMBLY_FOOL);
  if(rv!=HIPS_SUCCESS) IFPACK_CHK_ERR(-11);

  rv=HIPS_GetSolution(HIPS_id,A_->NumMyRows(),RowMap0_->MyGlobalElements(),Y[0],HIPS_ASSEMBLY_FOOL);
  if(rv!=HIPS_SUCCESS) {
    HIPS_PrintError(rv);
    IFPACK_CHK_ERR(-12);
  }

  ++NumApplyInverse_;
  ApplyInverseTime_ += Time_.ElapsedTime();

  return(0);
}


std::ostream& Ifpack_HIPS::Print(std::ostream& os) const{
  os<<"Need to add meaningful output"<<endl;
  return os;
}


double Ifpack_HIPS::Condest(const Ifpack_CondestType CT,
                             const int MaxIters,
                             const double Tol,
                             Epetra_RowMatrix* Matrix_in){
  return -1.0;
}




#endif