C++ AztecOO::SetProblem方法代码示例

int shylu_local_solve<Epetra_CrsMatrix, Epetra_MultiVector>
(
    shylu_symbolic<Epetra_CrsMatrix,Epetra_MultiVector> *ssym,
    shylu_data<Epetra_CrsMatrix,Epetra_MultiVector> *data,
    shylu_config<Epetra_CrsMatrix,Epetra_MultiVector> *config,
    const Epetra_MultiVector& X,
    Epetra_MultiVector& Y
)
{
    int err;
#ifndef NDEBUG
    int nvectors = X.NumVectors();
    assert (nvectors == data->localrhs->NumVectors());
#endif // NDEBUG

    // Initialize the X vector for iterative solver
    data->Xs->PutScalar(0.0);

    // Get local portion of X
    data->localrhs->Import(X, *(data->BdImporter), Insert);


    data->localrhs->Print(std::cout);
    std::cout << " " << std::endl;
    data->locallhs->Print(std::cout);

    // locallhs is z in paper
    if (config->amesosForDiagonal) {
        std::cout << "calling amesos for diagon" << endl;
        ssym->OrigLP->SetRHS((data->localrhs).getRawPtr());
        ssym->OrigLP->SetLHS((data->locallhs).getRawPtr());
        std::cout << "set RHS and LHS " << std::endl;
        ssym->ReIdx_LP->fwd();
        ssym->Solver->Solve();
    }
    else {
        ssym->ifSolver->ApplyInverse(*(data->localrhs), *(data->locallhs));
    }

    err = ssym->R->Multiply(false, *(data->locallhs), *(data->temp1));
    assert (err == 0);

    // Export temp1 to a dist vector - temp2
    data->temp2->Import(*(data->temp1), *(data->DistImporter), Insert);

    //Epetra_MultiVector Bs(SMap, nvectors); // b_2 - R * z in ShyLU paper
    data->Bs->Import(X, *(data->BsImporter), Insert);
    data->Bs->Update(-1.0, *(data->temp2), 1.0);

    AztecOO *solver = 0;
    Epetra_LinearProblem Problem(data->Sbar.get(),
                                 (data->Xs).getRawPtr(), (data->Bs).getRawPtr());
    if ((config->schurSolver == "G") || (config->schurSolver == "IQR"))
    {
        IFPACK_CHK_ERR(data->iqrSolver->Solve(*(data->schur_op),
                                              *(data->Bs), *(data->Xs)));
    }
    else if (config->schurSolver == "Amesos")
    {
        Amesos_BaseSolver *solver2 = data->dsolver;
        data->OrigLP2->SetLHS((data->Xs).getRawPtr());
        data->OrigLP2->SetRHS((data->Bs).getRawPtr());
        data->ReIdx_LP2->fwd();
        //cout << "Calling solve *****************************" << endl;
        solver2->Solve();
        //cout << "Out of solve *****************************" << endl;
    }
    else
    {
        if (config->libName == "Belos")
        {
            solver = data->innersolver;
            solver->SetLHS((data->Xs).getRawPtr());
            solver->SetRHS((data->Bs).getRawPtr());
        }
        else
        {
            // See the comment above on why we are not able to reuse the solver
            // when outer solve is AztecOO as well.
            solver = new AztecOO();
            //solver.SetPrecOperator(precop_);
            solver->SetAztecOption(AZ_solver, AZ_gmres);
            // Do not use AZ_none
            solver->SetAztecOption(AZ_precond, AZ_dom_decomp);
            //solver->SetAztecOption(AZ_precond, AZ_none);
            //solver->SetAztecOption(AZ_precond, AZ_Jacobi);
            ////solver->SetAztecOption(AZ_precond, AZ_Neumann);
            //solver->SetAztecOption(AZ_overlap, 3);
            //solver->SetAztecOption(AZ_subdomain_solve, AZ_ilu);
            //solver->SetAztecOption(AZ_output, AZ_all);
            //solver->SetAztecOption(AZ_diagnostics, AZ_all);
            solver->SetProblem(Problem);
        }

        // What should be a good inner_tolerance :-) ?
        solver->Iterate(config->inner_maxiters, config->inner_tolerance);
    }

    // Import Xs locally
    data->LocalXs->Import(*(data->Xs), *(data->XsImporter), Insert);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    if (config->schurSolver == "Amesos")
    {
        Amesos_BaseSolver *solver2 = data->dsolver;
        data->LP2->SetLHS(&Xs);
        data->LP2->SetRHS(&Bs);
        //cout << "Calling solve *****************************" << endl;
        solver2->Solve();
        //cout << "Out of solve *****************************" << endl;
    }
    else
    {
        if (config->libName == "Belos")
        {
            solver = data->innersolver;
            solver->SetLHS(&Xs);
            solver->SetRHS(&Bs);
        }
        else
        {
            // See the comment above on why we are not able to reuse the solver
            // when outer solve is AztecOO as well.
            solver = new AztecOO();
            //solver.SetPrecOperator(precop_);
            solver->SetAztecOption(AZ_solver, AZ_gmres);
            // Do not use AZ_none
            solver->SetAztecOption(AZ_precond, AZ_dom_decomp);
            //solver->SetAztecOption(AZ_precond, AZ_none);
            //solver->SetAztecOption(AZ_precond, AZ_Jacobi);
            ////solver->SetAztecOption(AZ_precond, AZ_Neumann);
            //solver->SetAztecOption(AZ_overlap, 3);
            //solver->SetAztecOption(AZ_subdomain_solve, AZ_ilu);
            //solver->SetAztecOption(AZ_output, AZ_all);
            //solver->SetAztecOption(AZ_diagnostics, AZ_all);
            solver->SetProblem(Problem);
        }

        // What should be a good inner_tolerance :-) ?
        solver->Iterate(config->inner_maxiters, config->inner_tolerance);
    }

    Epetra_MultiVector temp(BdMap, nvectors);
    ssym->C->Multiply(false, Xs, temp);
    temp.Update(1.0, Bd, -1.0);

    //Epetra_SerialComm LComm;        // Use Serial Comm for the local vectors.
    //Epetra_Map LocalBdMap(-1, data->Dnr, data->DRowElems, 0, LComm);
    //Epetra_MultiVector localrhs(LocalBdMap, nvectors);
    //Epetra_MultiVector locallhs(LocalBdMap, nvectors);

    //int lda;
    //double *values;
    err = temp.ExtractView(&values, &lda);
    assert (err == 0);
    //int nrows = data->Cptr->RowMap().NumMyElements();

    // copy to local vector //TODO: OMP ?
    assert(lda == nrows);
    for (int v = 0; v < nvectors; v++)
    {
        for (int i = 0; i < nrows; i++)
        {
            err = localrhs.ReplaceMyValue(i, v, values[i+v*lda]);
            assert (err == 0);
        }
    }