PetscSolver.cc

//
// Software License for AMDiS
//
// Copyright (c) 2010 Dresden University of Technology 
// All rights reserved.
// Authors: Simon Vey, Thomas Witkowski et al.
//
// This file is part of AMDiS
//
// See also license.opensource.txt in the distribution.


#include "AMDiS.h"
#include "parallel/PetscSolver.h"
#include "parallel/StdMpi.h"
#include "parallel/MpiHelper.h"
#include "parallel/ParallelDofMapping.h"

namespace AMDiS {

  using namespace std;

  PetscSolver::PetscSolver()
    : ParallelCoarseSpaceMatVec(),      
      kspPrefix(""),
      removeRhsNullspace(false),
      hasConstantNullspace(false)
  {
    string kspStr = "";
    Parameters::get("parallel->solver->petsc->ksp", kspStr);
    if (kspStr != "")
      PetscOptionsInsertString(kspStr.c_str());

    Parameters::get("parallel->remove rhs null space", removeRhsNullspace);
    Parameters::get("parallel->has constant null space", hasConstantNullspace);
    Parameters::get("parallel->nullspace->const in comp", 
		    constNullspaceComponent);
  }


  void PetscSolver::solve(Vec &rhs, Vec &sol)
  {
    FUNCNAME("PetscSolver::solve()");

    PetscErrorCode solverError = KSPSolve(kspInterior, rhs, sol);
    if (solverError != 0) {
      AMDiS::finalize();
      exit(-1);
    }
  }


  void PetscSolver::solveGlobal(Vec &rhs, Vec &sol)
  {
    FUNCNAME("PetscSolver::solveGlobal()");

    ERROR_EXIT("Not implemented!\n");
  }


  void PetscSolver::copyVec(Vec& originVec, Vec& destVec, 
			    vector<int>& originIndex, vector<int>& destIndex)
  {
    FUNCNAME("PetscSolver::copyVec()");

    IS originIs, destIs;
    ISCreateGeneral(mpiCommGlobal, 
		    originIndex.size(), 
		    &(originIndex[0]),
		    PETSC_USE_POINTER,
		    &originIs);

    ISCreateGeneral(mpiCommGlobal, 
		    destIndex.size(), 
		    &(destIndex[0]),
		    PETSC_USE_POINTER,
		    &destIs);

    VecScatter scatter;
    VecScatterCreate(originVec, originIs, destVec, destIs, &scatter);
    VecScatterBegin(scatter, originVec, destVec,
		    INSERT_VALUES, SCATTER_FORWARD);
    VecScatterEnd(scatter, originVec, destVec,
		  INSERT_VALUES, SCATTER_FORWARD);

    ISDestroy(&originIs);
    ISDestroy(&destIs);    
    VecScatterDestroy(&scatter);
  }

}