BelosPseudoBlockGmresSolMgr.hpp

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#ifndef BELOS_PSEUDO_BLOCK_GMRES_SOLMGR_HPP
#define BELOS_PSEUDO_BLOCK_GMRES_SOLMGR_HPP

#include "BelosConfigDefs.hpp"
#include "BelosTypes.hpp"

#include "BelosLinearProblem.hpp"
#include "BelosSolverManager.hpp"

#include "BelosPseudoBlockGmresIter.hpp"
#include "BelosOrthoManagerFactory.hpp"
#include "BelosStatusTestFactory.hpp"
#include "BelosStatusTestOutputFactory.hpp"
#include "BelosOutputManager.hpp"
#ifdef BELOS_TEUCHOS_TIME_MONITOR
#include "Teuchos_TimeMonitor.hpp"
#endif

namespace Belos {



  class PseudoBlockGmresSolMgrLinearProblemFailure : public BelosError {public:
    PseudoBlockGmresSolMgrLinearProblemFailure(const std::string& what_arg) : BelosError(what_arg)
    {}};

  class PseudoBlockGmresSolMgrOrthoFailure : public BelosError {public:
    PseudoBlockGmresSolMgrOrthoFailure(const std::string& what_arg) : BelosError(what_arg)
    {}};

  template<class ScalarType, class MV, class OP>
  class PseudoBlockGmresSolMgr : public SolverManager<ScalarType,MV,OP> {

  private:
    typedef MultiVecTraits<ScalarType,MV> MVT;
    typedef OperatorTraits<ScalarType,MV,OP> OPT;
    typedef Teuchos::ScalarTraits<ScalarType> SCT;
    typedef typename Teuchos::ScalarTraits<ScalarType>::magnitudeType MagnitudeType;
    typedef Teuchos::ScalarTraits<MagnitudeType> MT;

  public:



    PseudoBlockGmresSolMgr();

    PseudoBlockGmresSolMgr( const Teuchos::RCP<LinearProblem<ScalarType,MV,OP> > &problem,
                            const Teuchos::RCP<Teuchos::ParameterList> &pl );

    virtual ~PseudoBlockGmresSolMgr() {};

    Teuchos::RCP<SolverManager<ScalarType, MV, OP> > clone () const override {
      return Teuchos::rcp(new PseudoBlockGmresSolMgr<ScalarType,MV,OP>);
    }



    const LinearProblem<ScalarType,MV,OP>& getProblem() const override {
      return *problem_;
    }

    Teuchos::RCP<const Teuchos::ParameterList> getValidParameters() const override;

    Teuchos::RCP<const Teuchos::ParameterList> getCurrentParameters() const override { return params_; }

    Teuchos::Array<Teuchos::RCP<Teuchos::Time> > getTimers() const {
      return Teuchos::tuple(timerSolve_);
    }

    MagnitudeType achievedTol() const override {
      return achievedTol_;
    }

    int getNumIters() const override {
      return numIters_;
    }

    bool isLOADetected() const override { return loaDetected_; }

    const StatusTestResNorm<ScalarType,MV,OP> *
    getResidualStatusTest() const { return impConvTest_.getRawPtr(); }



    void setProblem (const Teuchos::RCP<LinearProblem<ScalarType,MV,OP> > &problem) override {
      problem_ = problem;
    }

    void setParameters (const Teuchos::RCP<Teuchos::ParameterList> &params) override;

    virtual void setUserConvStatusTest(
      const Teuchos::RCP<StatusTest<ScalarType,MV,OP> > &userConvStatusTest,
      const typename StatusTestCombo<ScalarType,MV,OP>::ComboType &comboType =
          StatusTestCombo<ScalarType,MV,OP>::SEQ
      ) override;

    void setDebugStatusTest( const Teuchos::RCP<StatusTest<ScalarType,MV,OP> > &debugStatusTest ) override;




    void reset( const ResetType type ) override { if ((type & Belos::Problem) && !Teuchos::is_null(problem_)) problem_->setProblem(); }



    ReturnType solve() override;



    void
    describe (Teuchos::FancyOStream& out,
              const Teuchos::EVerbosityLevel verbLevel =
              Teuchos::Describable::verbLevel_default) const override;

    std::string description () const override;


  private:

    bool checkStatusTest();

    Teuchos::RCP<LinearProblem<ScalarType,MV,OP> > problem_;

    // Output manager.
    Teuchos::RCP<OutputManager<ScalarType> > printer_;
    Teuchos::RCP<std::ostream> outputStream_;

    // Status tests.
    Teuchos::RCP<StatusTest<ScalarType,MV,OP> > userConvStatusTest_;
    Teuchos::RCP<StatusTest<ScalarType,MV,OP> > debugStatusTest_;
    Teuchos::RCP<StatusTest<ScalarType,MV,OP> > sTest_;
    Teuchos::RCP<StatusTestMaxIters<ScalarType,MV,OP> > maxIterTest_;
    Teuchos::RCP<StatusTest<ScalarType,MV,OP> > convTest_;
    Teuchos::RCP<StatusTestResNorm<ScalarType,MV,OP> > impConvTest_, expConvTest_;
    Teuchos::RCP<StatusTestOutput<ScalarType,MV,OP> > outputTest_;
    typename StatusTestCombo<ScalarType,MV,OP>::ComboType comboType_;
    Teuchos::RCP<std::map<std::string, Teuchos::RCP<StatusTest<ScalarType, MV, OP> > > > taggedTests_;

    // Orthogonalization manager.
    Teuchos::RCP<MatOrthoManager<ScalarType,MV,OP> > ortho_;

     // Current parameter list.
    Teuchos::RCP<Teuchos::ParameterList> params_;

    // Default solver values.
    static constexpr int maxRestarts_default_ = 20;
    static constexpr int maxIters_default_ = 1000;
    static constexpr bool showMaxResNormOnly_default_ = false;
    static constexpr int blockSize_default_ = 1;
    static constexpr int numBlocks_default_ = 300;
    static constexpr int verbosity_default_ = Belos::Errors;
    static constexpr int outputStyle_default_ = Belos::General;
    static constexpr int outputFreq_default_ = -1;
    static constexpr int defQuorum_default_ = 1;
    static constexpr const char * impResScale_default_ = "Norm of Preconditioned Initial Residual";
    static constexpr const char * expResScale_default_ = "Norm of Initial Residual";
    static constexpr const char * label_default_ = "Belos";
    static constexpr const char * orthoType_default_ = "ICGS";

    // Current solver values.
    MagnitudeType convtol_, orthoKappa_, achievedTol_;
    int maxRestarts_, maxIters_, numIters_;
    int blockSize_, numBlocks_, verbosity_, outputStyle_, outputFreq_, defQuorum_;
    bool showMaxResNormOnly_;
    std::string orthoType_;
    std::string impResScale_, expResScale_;
    MagnitudeType resScaleFactor_;

    // Timers.
    std::string label_;
    Teuchos::RCP<Teuchos::Time> timerSolve_;

    // Internal state variables.
    bool isSet_, isSTSet_, expResTest_;
    bool loaDetected_;
  };


// Empty Constructor
template<class ScalarType, class MV, class OP>
PseudoBlockGmresSolMgr<ScalarType,MV,OP>::PseudoBlockGmresSolMgr() :
  outputStream_(Teuchos::rcpFromRef(std::cout)),
  taggedTests_(Teuchos::null),
  convtol_(DefaultSolverParameters::convTol),
  orthoKappa_(DefaultSolverParameters::orthoKappa),
  achievedTol_(Teuchos::ScalarTraits<typename Teuchos::ScalarTraits<ScalarType>::magnitudeType>::zero()),
  maxRestarts_(maxRestarts_default_),
  maxIters_(maxIters_default_),
  numIters_(0),
  blockSize_(blockSize_default_),
  numBlocks_(numBlocks_default_),
  verbosity_(verbosity_default_),
  outputStyle_(outputStyle_default_),
  outputFreq_(outputFreq_default_),
  defQuorum_(defQuorum_default_),
  showMaxResNormOnly_(showMaxResNormOnly_default_),
  orthoType_(orthoType_default_),
  impResScale_(impResScale_default_),
  expResScale_(expResScale_default_),
  resScaleFactor_(DefaultSolverParameters::resScaleFactor),
  label_(label_default_),
  isSet_(false),
  isSTSet_(false),
  expResTest_(false),
  loaDetected_(false)
{}

// Basic Constructor
template<class ScalarType, class MV, class OP>
PseudoBlockGmresSolMgr<ScalarType,MV,OP>::
PseudoBlockGmresSolMgr (const Teuchos::RCP<LinearProblem<ScalarType,MV,OP> > &problem,
                        const Teuchos::RCP<Teuchos::ParameterList> &pl) :
  problem_(problem),
  outputStream_(Teuchos::rcpFromRef(std::cout)),
  taggedTests_(Teuchos::null),
  convtol_(DefaultSolverParameters::convTol),
  orthoKappa_(DefaultSolverParameters::orthoKappa),
  achievedTol_(Teuchos::ScalarTraits<typename Teuchos::ScalarTraits<ScalarType>::magnitudeType>::zero()),
  maxRestarts_(maxRestarts_default_),
  maxIters_(maxIters_default_),
  numIters_(0),
  blockSize_(blockSize_default_),
  numBlocks_(numBlocks_default_),
  verbosity_(verbosity_default_),
  outputStyle_(outputStyle_default_),
  outputFreq_(outputFreq_default_),
  defQuorum_(defQuorum_default_),
  showMaxResNormOnly_(showMaxResNormOnly_default_),
  orthoType_(orthoType_default_),
  impResScale_(impResScale_default_),
  expResScale_(expResScale_default_),
  resScaleFactor_(DefaultSolverParameters::resScaleFactor),
  label_(label_default_),
  isSet_(false),
  isSTSet_(false),
  expResTest_(false),
  loaDetected_(false)
{
  TEUCHOS_TEST_FOR_EXCEPTION(problem_ == Teuchos::null, std::invalid_argument, "Problem not given to solver manager.");

  // If the parameter list pointer is null, then set the current parameters to the default parameter list.
  if (!is_null(pl)) {
    // Set the parameters using the list that was passed in.
    setParameters( pl );
  }
}

template<class ScalarType, class MV, class OP>
void
PseudoBlockGmresSolMgr<ScalarType,MV,OP>::
setParameters (const Teuchos::RCP<Teuchos::ParameterList>& params)
{
  using Teuchos::ParameterList;
  using Teuchos::parameterList;
  using Teuchos::rcp;
  using Teuchos::rcp_dynamic_cast;

  // Create the internal parameter list if one doesn't already exist.
  if (params_ == Teuchos::null) {
    params_ = parameterList (*getValidParameters ());
  } else {
    // TAW: 3/8/2016: do not validate sub parameter lists as they
    //                might not have a pre-defined structure
    //                e.g. user-specified status tests
    // The Belos Pseudo Block GMRES parameters on the first level are
    // not affected and verified.
    params->validateParameters (*getValidParameters (), 0);
  }

  // Check for maximum number of restarts
  if (params->isParameter ("Maximum Restarts")) {
    maxRestarts_ = params->get ("Maximum Restarts", maxRestarts_default_);

    // Update parameter in our list.
    params_->set ("Maximum Restarts", maxRestarts_);
  }

  // Check for maximum number of iterations
  if (params->isParameter ("Maximum Iterations")) {
    maxIters_ = params->get ("Maximum Iterations", maxIters_default_);

    // Update parameter in our list and in status test.
    params_->set ("Maximum Iterations", maxIters_);
    if (! maxIterTest_.is_null ()) {
      maxIterTest_->setMaxIters (maxIters_);
    }
  }

  // Check for blocksize
  if (params->isParameter ("Block Size")) {
    blockSize_ = params->get ("Block Size", blockSize_default_);
    TEUCHOS_TEST_FOR_EXCEPTION(
      blockSize_ <= 0, std::invalid_argument,
      "Belos::PseudoBlockGmresSolMgr::setParameters: "
      "The \"Block Size\" parameter must be strictly positive, "
      "but you specified a value of " << blockSize_ << ".");

    // Update parameter in our list.
    params_->set ("Block Size", blockSize_);
  }

  // Check for the maximum number of blocks.
  if (params->isParameter ("Num Blocks")) {
    numBlocks_ = params->get ("Num Blocks", numBlocks_default_);
    TEUCHOS_TEST_FOR_EXCEPTION(
      numBlocks_ <= 0, std::invalid_argument,
      "Belos::PseudoBlockGmresSolMgr::setParameters: "
      "The \"Num Blocks\" parameter must be strictly positive, "
      "but you specified a value of " << numBlocks_ << ".");

    // Update parameter in our list.
    params_->set ("Num Blocks", numBlocks_);
  }

  // Check to see if the timer label changed.
  if (params->isParameter ("Timer Label")) {
    const std::string tempLabel = params->get ("Timer Label", label_default_);

    // Update parameter in our list and solver timer
    if (tempLabel != label_) {
      label_ = tempLabel;
      params_->set ("Timer Label", label_);
      const std::string solveLabel =
        label_ + ": PseudoBlockGmresSolMgr total solve time";
#ifdef BELOS_TEUCHOS_TIME_MONITOR
      timerSolve_ = Teuchos::TimeMonitor::getNewCounter (solveLabel);
#endif // BELOS_TEUCHOS_TIME_MONITOR
      if (ortho_ != Teuchos::null) {
        ortho_->setLabel( label_ );
      }
    }
  }


  // Check for a change in verbosity level
  if (params->isParameter ("Verbosity")) {
    if (Teuchos::isParameterType<int> (*params, "Verbosity")) {
      verbosity_ = params->get ("Verbosity", verbosity_default_);
    } else {
      verbosity_ = (int) Teuchos::getParameter<Belos::MsgType> (*params, "Verbosity");
    }

    // Update parameter in our list.
    params_->set ("Verbosity", verbosity_);
    if (! printer_.is_null ()) {
      printer_->setVerbosity (verbosity_);
    }
  }

  // Check for a change in output style.
  if (params->isParameter ("Output Style")) {
    if (Teuchos::isParameterType<int> (*params, "Output Style")) {
      outputStyle_ = params->get ("Output Style", outputStyle_default_);
    } else {
      outputStyle_ = (int) Teuchos::getParameter<Belos::OutputType> (*params, "Output Style");
    }

    // Update parameter in our list.
    params_->set ("Output Style", outputStyle_);
    if (! outputTest_.is_null ()) {
      isSTSet_ = false;
    }

  }

  // Check if user has specified his own status tests
  if (params->isSublist ("User Status Tests")) {
    Teuchos::ParameterList userStatusTestsList = params->sublist("User Status Tests",true);
    if ( userStatusTestsList.numParams() > 0 ) {
      std::string userCombo_string = params->get<std::string>("User Status Tests Combo Type", "SEQ");
      Teuchos::RCP<StatusTestFactory<ScalarType,MV,OP> > testFactory = Teuchos::rcp(new StatusTestFactory<ScalarType,MV,OP>());
      setUserConvStatusTest( testFactory->buildStatusTests(userStatusTestsList), testFactory->stringToComboType(userCombo_string) );
      taggedTests_ = testFactory->getTaggedTests();
      isSTSet_ = false;
    }
  }

  // output stream
  if (params->isParameter ("Output Stream")) {
    outputStream_ = Teuchos::getParameter<Teuchos::RCP<std::ostream> > (*params, "Output Stream");

    // Update parameter in our list.
    params_->set("Output Stream", outputStream_);
    if (! printer_.is_null ()) {
      printer_->setOStream (outputStream_);
    }
  }

  // frequency level
  if (verbosity_ & Belos::StatusTestDetails) {
    if (params->isParameter ("Output Frequency")) {
      outputFreq_ = params->get ("Output Frequency", outputFreq_default_);
    }

    // Update parameter in out list and output status test.
    params_->set ("Output Frequency", outputFreq_);
    if (! outputTest_.is_null ()) {
      outputTest_->setOutputFrequency (outputFreq_);
    }
  }

  // Create output manager if we need to.
  if (printer_.is_null ()) {
    printer_ = rcp (new OutputManager<ScalarType> (verbosity_, outputStream_));
  }

  // Check if the orthogonalization changed.
  bool changedOrthoType = false;
  if (params->isParameter ("Orthogonalization")) {
    std::string tempOrthoType = params->get ("Orthogonalization", orthoType_default_);
    if (tempOrthoType != orthoType_) {
      orthoType_ = tempOrthoType;
      changedOrthoType = true; 
    }
  }
  params_->set("Orthogonalization", orthoType_);

  // Check which orthogonalization constant to use.
  if (params->isParameter ("Orthogonalization Constant")) {
    if (params->isType<MagnitudeType> ("Orthogonalization Constant")) {
      orthoKappa_ = params->get ("Orthogonalization Constant",
                                 static_cast<MagnitudeType> (DefaultSolverParameters::orthoKappa));
    }
    else {
      orthoKappa_ = params->get ("Orthogonalization Constant",
                                 DefaultSolverParameters::orthoKappa);
    }

    // Update parameter in our list.
    params_->set ("Orthogonalization Constant", orthoKappa_);
    if (orthoType_ == "DGKS") {
      if (orthoKappa_ > 0 && ! ortho_.is_null() && !changedOrthoType) {
        typedef DGKSOrthoManager<ScalarType, MV, OP> ortho_type;
        rcp_dynamic_cast<ortho_type> (ortho_)->setDepTol (orthoKappa_);
      }
    }
  }

  // Create orthogonalization manager if we need to.
  if (ortho_.is_null() || changedOrthoType) {
    Belos::OrthoManagerFactory<ScalarType, MV, OP> factory;
    Teuchos::RCP<Teuchos::ParameterList> paramsOrtho;   // can be null
    if (orthoType_=="DGKS" && orthoKappa_ > 0) {
      paramsOrtho->set ("depTol", orthoKappa_ );
    }

    ortho_ = factory.makeMatOrthoManager (orthoType_, Teuchos::null, printer_, label_, paramsOrtho);
  }

  // Convergence

  // Check for convergence tolerance
  if (params->isParameter ("Convergence Tolerance")) {
    if (params->isType<MagnitudeType> ("Convergence Tolerance")) {
      convtol_ = params->get ("Convergence Tolerance",
                              static_cast<MagnitudeType> (DefaultSolverParameters::convTol));
    }
    else {
      convtol_ = params->get ("Convergence Tolerance", DefaultSolverParameters::convTol);
    }

    // Update parameter in our list and residual tests.
    params_->set ("Convergence Tolerance", convtol_);
    if (! impConvTest_.is_null ()) {
      impConvTest_->setTolerance (convtol_);
    }
    if (! expConvTest_.is_null ()) {
      expConvTest_->setTolerance (convtol_);
    }
  }

  // Grab the user defined residual scaling
  bool userDefinedResidualScalingUpdated = false;
  if (params->isParameter ("User Defined Residual Scaling")) {
    MagnitudeType tempResScaleFactor = DefaultSolverParameters::resScaleFactor;
    if (params->isType<MagnitudeType> ("User Defined Residual Scaling")) {
      tempResScaleFactor = params->get ("User Defined Residual Scaling",
                                        static_cast<MagnitudeType> (DefaultSolverParameters::resScaleFactor));
    }
    else {
      tempResScaleFactor = params->get ("User Defined Residual Scaling",
                                        DefaultSolverParameters::resScaleFactor);
    }

    // Only update the scaling if it's different.
    if (resScaleFactor_ != tempResScaleFactor) {
      resScaleFactor_ = tempResScaleFactor;
      userDefinedResidualScalingUpdated = true;
    }

    if(userDefinedResidualScalingUpdated)
    {
      if (! params->isParameter ("Implicit Residual Scaling") && ! impConvTest_.is_null ()) {
        try {
          if(impResScale_ == "User Provided")
            impConvTest_->defineScaleForm (Belos::UserProvided, Belos::TwoNorm, resScaleFactor_);
        }
        catch (std::exception& e) {
          // Make sure the convergence test gets constructed again.
          isSTSet_ = false;
        }
      }
      if (! params->isParameter ("Explicit Residual Scaling") && ! expConvTest_.is_null ()) {
        try {
          if(expResScale_ == "User Provided")
            expConvTest_->defineScaleForm (Belos::UserProvided, Belos::TwoNorm, resScaleFactor_);
        }
        catch (std::exception& e) {
          // Make sure the convergence test gets constructed again.
          isSTSet_ = false;
        }
      }
    }
  }

  // Check for a change in scaling, if so we need to build new residual tests.
  if (params->isParameter ("Implicit Residual Scaling")) {
    const std::string tempImpResScale =
      Teuchos::getParameter<std::string> (*params, "Implicit Residual Scaling");

    // Only update the scaling if it's different.
    if (impResScale_ != tempImpResScale) {
      Belos::ScaleType impResScaleType = convertStringToScaleType (tempImpResScale);
      impResScale_ = tempImpResScale;

      // Update parameter in our list and residual tests
      params_->set ("Implicit Residual Scaling", impResScale_);
      if (! impConvTest_.is_null ()) {
        try {
          if(impResScale_ == "User Provided")
            impConvTest_->defineScaleForm (impResScaleType, Belos::TwoNorm, resScaleFactor_);
          else
            impConvTest_->defineScaleForm (impResScaleType, Belos::TwoNorm);
        }
        catch (std::exception& e) {
          // Make sure the convergence test gets constructed again.
          isSTSet_ = false;
        }
      }
    }
    else if (userDefinedResidualScalingUpdated) {
      Belos::ScaleType impResScaleType = convertStringToScaleType (impResScale_);

      if (! impConvTest_.is_null ()) {
        try {
          if(impResScale_ == "User Provided")
            impConvTest_->defineScaleForm (impResScaleType, Belos::TwoNorm, resScaleFactor_);
        }
        catch (std::exception& e) {
          // Make sure the convergence test gets constructed again.
          isSTSet_ = false;
        }
      }
    }
  }

  if (params->isParameter ("Explicit Residual Scaling")) {
    const std::string tempExpResScale =
      Teuchos::getParameter<std::string> (*params, "Explicit Residual Scaling");

    // Only update the scaling if it's different.
    if (expResScale_ != tempExpResScale) {
      Belos::ScaleType expResScaleType = convertStringToScaleType (tempExpResScale);
      expResScale_ = tempExpResScale;

      // Update parameter in our list and residual tests
      params_->set ("Explicit Residual Scaling", expResScale_);
      if (! expConvTest_.is_null ()) {
        try {
          if(expResScale_ == "User Provided")
            expConvTest_->defineScaleForm (expResScaleType, Belos::TwoNorm, resScaleFactor_);
          else
            expConvTest_->defineScaleForm (expResScaleType, Belos::TwoNorm);
        }
        catch (std::exception& e) {
          // Make sure the convergence test gets constructed again.
          isSTSet_ = false;
        }
      }
    }
    else if (userDefinedResidualScalingUpdated) {
      Belos::ScaleType expResScaleType = convertStringToScaleType (expResScale_);

      if (! expConvTest_.is_null ()) {
        try {
          if(expResScale_ == "User Provided")
            expConvTest_->defineScaleForm (expResScaleType, Belos::TwoNorm, resScaleFactor_);
        }
        catch (std::exception& e) {
          // Make sure the convergence test gets constructed again.
          isSTSet_ = false;
        }
      }
    }
  }


  if (params->isParameter ("Show Maximum Residual Norm Only")) {
    showMaxResNormOnly_ =
      Teuchos::getParameter<bool> (*params, "Show Maximum Residual Norm Only");

    // Update parameter in our list and residual tests
    params_->set ("Show Maximum Residual Norm Only", showMaxResNormOnly_);
    if (! impConvTest_.is_null ()) {
      impConvTest_->setShowMaxResNormOnly (showMaxResNormOnly_);
    }
    if (! expConvTest_.is_null ()) {
      expConvTest_->setShowMaxResNormOnly (showMaxResNormOnly_);
    }
  }

  // Create status tests if we need to.

  // Get the deflation quorum, or number of converged systems before deflation is allowed
  if (params->isParameter("Deflation Quorum")) {
    defQuorum_ = params->get("Deflation Quorum", defQuorum_);
    TEUCHOS_TEST_FOR_EXCEPTION(
      defQuorum_ > blockSize_, std::invalid_argument,
      "Belos::PseudoBlockGmresSolMgr::setParameters: "
      "The \"Deflation Quorum\" parameter (= " << defQuorum_ << ") must not be "
      "larger than \"Block Size\" (= " << blockSize_ << ").");
    params_->set ("Deflation Quorum", defQuorum_);
    if (! impConvTest_.is_null ()) {
      impConvTest_->setQuorum (defQuorum_);
    }
    if (! expConvTest_.is_null ()) {
      expConvTest_->setQuorum (defQuorum_);
    }
  }

  // Create the timer if we need to.
  if (timerSolve_ == Teuchos::null) {
    std::string solveLabel = label_ + ": PseudoBlockGmresSolMgr total solve time";
#ifdef BELOS_TEUCHOS_TIME_MONITOR
    timerSolve_ = Teuchos::TimeMonitor::getNewCounter (solveLabel);
#endif
  }

  // Inform the solver manager that the current parameters were set.
  isSet_ = true;
}


template<class ScalarType, class MV, class OP>
void
PseudoBlockGmresSolMgr<ScalarType,MV,OP>::setUserConvStatusTest(
  const Teuchos::RCP<StatusTest<ScalarType,MV,OP> > &userConvStatusTest,
  const typename StatusTestCombo<ScalarType,MV,OP>::ComboType &comboType
  )
{
  userConvStatusTest_ = userConvStatusTest;
  comboType_ = comboType;
}

template<class ScalarType, class MV, class OP>
void
PseudoBlockGmresSolMgr<ScalarType,MV,OP>::setDebugStatusTest(
  const Teuchos::RCP<StatusTest<ScalarType,MV,OP> > &debugStatusTest
  )
{
  debugStatusTest_ = debugStatusTest;
}



template<class ScalarType, class MV, class OP>
Teuchos::RCP<const Teuchos::ParameterList>
PseudoBlockGmresSolMgr<ScalarType,MV,OP>::getValidParameters() const
{
  static Teuchos::RCP<const Teuchos::ParameterList> validPL;
  if (is_null(validPL)) {
    Teuchos::RCP<Teuchos::ParameterList> pl = Teuchos::parameterList();
    // Set all the valid parameters and their default values.

    // The static_cast is to resolve an issue with older clang versions which
    // would cause the constexpr to link fail. With c++17 the problem is resolved.
    pl= Teuchos::rcp( new Teuchos::ParameterList() );
    pl->set("Convergence Tolerance", static_cast<MagnitudeType>(DefaultSolverParameters::convTol),
      "The relative residual tolerance that needs to be achieved by the\n"
      "iterative solver in order for the linear system to be declared converged.");
    pl->set("Maximum Restarts", static_cast<int>(maxRestarts_default_),
      "The maximum number of restarts allowed for each\n"
      "set of RHS solved.");
    pl->set("Maximum Iterations", static_cast<int>(maxIters_default_),
      "The maximum number of block iterations allowed for each\n"
      "set of RHS solved.");
    pl->set("Num Blocks", static_cast<int>(numBlocks_default_),
      "The maximum number of vectors allowed in the Krylov subspace\n"
      "for each set of RHS solved.");
    pl->set("Block Size", static_cast<int>(blockSize_default_),
      "The number of RHS solved simultaneously.");
    pl->set("Verbosity", static_cast<int>(verbosity_default_),
      "What type(s) of solver information should be outputted\n"
      "to the output stream.");
    pl->set("Output Style", static_cast<int>(outputStyle_default_),
      "What style is used for the solver information outputted\n"
      "to the output stream.");
    pl->set("Output Frequency", static_cast<int>(outputFreq_default_),
      "How often convergence information should be outputted\n"
      "to the output stream.");
    pl->set("Deflation Quorum", static_cast<int>(defQuorum_default_),
      "The number of linear systems that need to converge before\n"
      "they are deflated.  This number should be <= block size.");
    pl->set("Output Stream", Teuchos::rcpFromRef(std::cout),
      "A reference-counted pointer to the output stream where all\n"
      "solver output is sent.");
    pl->set("Show Maximum Residual Norm Only", static_cast<bool>(showMaxResNormOnly_default_),
      "When convergence information is printed, only show the maximum\n"
      "relative residual norm when the block size is greater than one.");
    pl->set("Implicit Residual Scaling", static_cast<const char *>(impResScale_default_),
      "The type of scaling used in the implicit residual convergence test.");
    pl->set("Explicit Residual Scaling", static_cast<const char *>(expResScale_default_),
      "The type of scaling used in the explicit residual convergence test.");
    pl->set("Timer Label", static_cast<const char *>(label_default_),
      "The string to use as a prefix for the timer labels.");
    pl->set("Orthogonalization", static_cast<const char *>(orthoType_default_),
      "The type of orthogonalization to use.");
    pl->set("Orthogonalization Constant",static_cast<MagnitudeType>(DefaultSolverParameters::orthoKappa),
      "The constant used by DGKS orthogonalization to determine\n"
      "whether another step of classical Gram-Schmidt is necessary.");
    pl->sublist("User Status Tests");
    pl->set("User Status Tests Combo Type", "SEQ",
        "Type of logical combination operation of user-defined\n"
        "and/or solver-specific status tests.");
    validPL = pl;
  }
  return validPL;
}

// Check the status test versus the defined linear problem
template<class ScalarType, class MV, class OP>
bool PseudoBlockGmresSolMgr<ScalarType,MV,OP>::checkStatusTest() {

  typedef Belos::StatusTestCombo<ScalarType,MV,OP>  StatusTestCombo_t;
  typedef Belos::StatusTestGenResNorm<ScalarType,MV,OP>  StatusTestGenResNorm_t;
  typedef Belos::StatusTestImpResNorm<ScalarType,MV,OP>  StatusTestImpResNorm_t;

  // Basic test checks maximum iterations and native residual.
  maxIterTest_ = Teuchos::rcp( new StatusTestMaxIters<ScalarType,MV,OP>( maxIters_ ) );

  // If there is a left preconditioner, we create a combined status test that checks the implicit
  // and then explicit residual norm to see if we have convergence.
  if ( !Teuchos::is_null(problem_->getLeftPrec()) ) {
    expResTest_ = true;
  }

  if (expResTest_) {

    // Implicit residual test, using the native residual to determine if convergence was achieved.
    Teuchos::RCP<StatusTestGenResNorm_t> tmpImpConvTest =
      Teuchos::rcp( new StatusTestGenResNorm_t( convtol_, defQuorum_ ) );
    if(impResScale_ == "User Provided")
      tmpImpConvTest->defineScaleForm( convertStringToScaleType(impResScale_), Belos::TwoNorm, resScaleFactor_ );
    else
      tmpImpConvTest->defineScaleForm( convertStringToScaleType(impResScale_), Belos::TwoNorm );

    tmpImpConvTest->setShowMaxResNormOnly( showMaxResNormOnly_ );
    impConvTest_ = tmpImpConvTest;

    // Explicit residual test once the native residual is below the tolerance
    Teuchos::RCP<StatusTestGenResNorm_t> tmpExpConvTest =
      Teuchos::rcp( new StatusTestGenResNorm_t( convtol_, defQuorum_ ) );
    tmpExpConvTest->defineResForm( StatusTestGenResNorm_t::Explicit, Belos::TwoNorm );
    if(expResScale_ == "User Provided")
      tmpExpConvTest->defineScaleForm( convertStringToScaleType(expResScale_), Belos::TwoNorm, resScaleFactor_ );
    else
      tmpExpConvTest->defineScaleForm( convertStringToScaleType(expResScale_), Belos::TwoNorm );
    tmpExpConvTest->setShowMaxResNormOnly( showMaxResNormOnly_ );
    expConvTest_ = tmpExpConvTest;

    // The convergence test is a combination of the "cheap" implicit test and explicit test.
    convTest_ = Teuchos::rcp( new StatusTestCombo_t( StatusTestCombo_t::SEQ, impConvTest_, expConvTest_ ) );
  }
  else {

    // Implicit residual test, using the native residual to determine if convergence was achieved.
    // Use test that checks for loss of accuracy.
    Teuchos::RCP<StatusTestImpResNorm_t> tmpImpConvTest =
      Teuchos::rcp( new StatusTestImpResNorm_t( convtol_, defQuorum_ ) );
    if(impResScale_ == "User Provided")
      tmpImpConvTest->defineScaleForm( convertStringToScaleType(impResScale_), Belos::TwoNorm, resScaleFactor_ );
    else
      tmpImpConvTest->defineScaleForm( convertStringToScaleType(impResScale_), Belos::TwoNorm );
    tmpImpConvTest->setShowMaxResNormOnly( showMaxResNormOnly_ );
    impConvTest_ = tmpImpConvTest;

    // Set the explicit and total convergence test to this implicit test that checks for accuracy loss.
    expConvTest_ = impConvTest_;
    convTest_ = impConvTest_;
  }

  if (nonnull(userConvStatusTest_) ) {
    // Check if this is a combination of several StatusTestResNorm objects
    Teuchos::RCP<StatusTestCombo_t> tmpComboTest = Teuchos::rcp_dynamic_cast<StatusTestCombo_t>(userConvStatusTest_);
    if (tmpComboTest != Teuchos::null) {
      std::vector<Teuchos::RCP<StatusTest<ScalarType,MV,OP> > > tmpVec = tmpComboTest->getStatusTests();
      comboType_ = tmpComboTest->getComboType();
      const int numResTests = static_cast<int>(tmpVec.size());
      auto newConvTest = Teuchos::rcp(new StatusTestCombo_t(comboType_));
      newConvTest->addStatusTest(convTest_);
      for (int j = 0; j < numResTests; ++j) {
        newConvTest->addStatusTest(tmpVec[j]);
      }
      convTest_ = newConvTest;
    }
    else{
      // Override the overall convergence test with the users convergence test
      convTest_ = Teuchos::rcp(
        new StatusTestCombo_t( comboType_, convTest_, userConvStatusTest_ ) );
      // brief output style not compatible with more general combinations
      //outputStyle_ = Belos::General;
      // NOTE: Above, you have to run the other convergence tests also because
      // the logic in this class depends on it.  This is very unfortunate.
    }
  }

  sTest_ = Teuchos::rcp( new StatusTestCombo_t( StatusTestCombo_t::OR, maxIterTest_, convTest_ ) );

  // Add debug status test, if one is provided by the user
  if (nonnull(debugStatusTest_) ) {
    // Add debug convergence test
    Teuchos::rcp_dynamic_cast<StatusTestCombo_t>(sTest_)->addStatusTest( debugStatusTest_ );
  }

  // Create the status test output class.
  // This class manages and formats the output from the status test.
  StatusTestOutputFactory<ScalarType,MV,OP> stoFactory( outputStyle_, taggedTests_ );
  outputTest_ = stoFactory.create( printer_, sTest_, outputFreq_, Passed+Failed+Undefined );

  // Set the solver string for the output test
  std::string solverDesc = " Pseudo Block Gmres ";
  outputTest_->setSolverDesc( solverDesc );


  // The status test is now set.
  isSTSet_ = true;

  return false;
}


// solve()
template<class ScalarType, class MV, class OP>
ReturnType PseudoBlockGmresSolMgr<ScalarType,MV,OP>::solve() {

  // Set the current parameters if they were not set before.
  // NOTE:  This may occur if the user generated the solver manager with the default constructor and
  // then didn't set any parameters using setParameters().
  if (!isSet_) { setParameters( params_ ); }

  TEUCHOS_TEST_FOR_EXCEPTION(!problem_->isProblemSet(),PseudoBlockGmresSolMgrLinearProblemFailure,
                     "Belos::PseudoBlockGmresSolMgr::solve(): Linear problem is not ready, setProblem() has not been called.");

  // Check if we have to create the status tests.
  if (!isSTSet_ || (!expResTest_ && !Teuchos::is_null(problem_->getLeftPrec())) ) {
    TEUCHOS_TEST_FOR_EXCEPTION( checkStatusTest(),PseudoBlockGmresSolMgrLinearProblemFailure,
      "Belos::BlockGmresSolMgr::solve(): Linear problem and requested status tests are incompatible.");
  }

  // Create indices for the linear systems to be solved.
  int startPtr = 0;
  int numRHS2Solve = MVT::GetNumberVecs( *(problem_->getRHS()) );
  int numCurrRHS = ( numRHS2Solve < blockSize_) ? numRHS2Solve : blockSize_;

  std::vector<int> currIdx( numCurrRHS );
  blockSize_ = numCurrRHS;
  for (int i=0; i<numCurrRHS; ++i)
    { currIdx[i] = startPtr+i; }

  // Inform the linear problem of the current linear system to solve.
  problem_->setLSIndex( currIdx );

  // Parameter list
  Teuchos::ParameterList plist;
  plist.set("Num Blocks",numBlocks_);

  // Reset the status test.
  outputTest_->reset();
  loaDetected_ = false;

  // Assume convergence is achieved, then let any failed convergence set this to false.
  bool isConverged = true;

  // BlockGmres solver

  Teuchos::RCP<PseudoBlockGmresIter<ScalarType,MV,OP> > block_gmres_iter
    = Teuchos::rcp( new PseudoBlockGmresIter<ScalarType,MV,OP>(problem_,printer_,outputTest_,ortho_,plist) );

  // Enter solve() iterations
  {
#ifdef BELOS_TEUCHOS_TIME_MONITOR
    Teuchos::TimeMonitor slvtimer(*timerSolve_);
#endif

    while ( numRHS2Solve > 0 ) {

      // Reset the active / converged vectors from this block
      std::vector<int> convRHSIdx;
      std::vector<int> currRHSIdx( currIdx );
      currRHSIdx.resize(numCurrRHS);

      // Set the current number of blocks with the pseudo Gmres iteration.
      block_gmres_iter->setNumBlocks( numBlocks_ );

      // Reset the number of iterations.
      block_gmres_iter->resetNumIters();

      // Reset the number of calls that the status test output knows about.
      outputTest_->resetNumCalls();

      // Get a new state struct and initialize the solver.
      PseudoBlockGmresIterState<ScalarType,MV> newState;

      // Create the first block in the current Krylov basis for each right-hand side.
      std::vector<int> index(1);
      Teuchos::RCP<MV> tmpV, R_0 = MVT::CloneCopy( *(problem_->getInitPrecResVec()), currIdx );
      newState.V.resize( blockSize_ );
      newState.Z.resize( blockSize_ );
      for (int i=0; i<blockSize_; ++i) {
        index[0]=i;
        tmpV = MVT::CloneViewNonConst( *R_0, index );

        // Get a matrix to hold the orthonormalization coefficients.
        Teuchos::RCP<Teuchos::SerialDenseVector<int,ScalarType> > tmpZ
          = Teuchos::rcp( new Teuchos::SerialDenseVector<int,ScalarType>( 1 ));

        // Orthonormalize the new V_0
        int rank = ortho_->normalize( *tmpV, tmpZ );
        TEUCHOS_TEST_FOR_EXCEPTION(rank != 1, PseudoBlockGmresSolMgrOrthoFailure,
            "Belos::PseudoBlockGmresSolMgr::solve(): Failed to compute initial block of orthonormal vectors.");

        newState.V[i] = tmpV;
        newState.Z[i] = tmpZ;
      }

      newState.curDim = 0;
      block_gmres_iter->initialize(newState);
      int numRestarts = 0;

      while(1) {

        // tell block_gmres_iter to iterate
        try {
          block_gmres_iter->iterate();

          //
          // check convergence first
          //
          if ( convTest_->getStatus() == Passed ) {

            if ( expConvTest_->getLOADetected() ) {
              // Oops!  There was a loss of accuracy (LOA) for one or
              // more right-hand sides.  That means the implicit
              // (a.k.a. "native") residuals claim convergence,
              // whereas the explicit (hence expConvTest_, i.e.,
              // "explicit convergence test") residuals have not
              // converged.
              //
              // We choose to deal with this situation by deflating
              // out the affected right-hand sides and moving on.
              loaDetected_ = true;
              printer_->stream(Warnings) <<
                "Belos::PseudoBlockGmresSolMgr::solve(): Warning! Solver has experienced a loss of accuracy!" << std::endl;
              isConverged = false;
            }

            // Figure out which linear systems converged.
            std::vector<int> convIdx = expConvTest_->convIndices();

            // If the number of converged linear systems is equal to the
            // number of current linear systems, then we are done with this block.
            if (convIdx.size() == currRHSIdx.size())
              break;  // break from while(1){block_gmres_iter->iterate()}

            // Get a new state struct and initialize the solver.
            PseudoBlockGmresIterState<ScalarType,MV> defState;

            // Inform the linear problem that we are finished with this current linear system.
            problem_->setCurrLS();

            // Get the state.
            PseudoBlockGmresIterState<ScalarType,MV> oldState = block_gmres_iter->getState();
            int curDim = oldState.curDim;

            // Get a new state struct and reset currRHSIdx to have the right-hand sides that
            // are left to converge for this block.
            int have = 0;
            std::vector<int> oldRHSIdx( currRHSIdx );
            std::vector<int> defRHSIdx;
            for (unsigned int i=0; i<currRHSIdx.size(); ++i) {
              bool found = false;
              for (unsigned int j=0; j<convIdx.size(); ++j) {
                if (currRHSIdx[i] == convIdx[j]) {
                  found = true;
                  break;
                }
              }
              if (found) {
                defRHSIdx.push_back( i );
              }
              else {
                defState.V.push_back( Teuchos::rcp_const_cast<MV>( oldState.V[i] ) );
                defState.Z.push_back( Teuchos::rcp_const_cast<Teuchos::SerialDenseVector<int,ScalarType> >( oldState.Z[i] ) );
                defState.H.push_back( Teuchos::rcp_const_cast<Teuchos::SerialDenseMatrix<int,ScalarType> >( oldState.H[i] ) );
                defState.sn.push_back( Teuchos::rcp_const_cast<Teuchos::SerialDenseVector<int,ScalarType> >( oldState.sn[i] ) );
                defState.cs.push_back( Teuchos::rcp_const_cast<Teuchos::SerialDenseVector<int,MagnitudeType> >(oldState.cs[i] ) );
                currRHSIdx[have] = currRHSIdx[i];
                have++;
              }
            }
            defRHSIdx.resize(currRHSIdx.size()-have);
            currRHSIdx.resize(have);

            // Compute the current solution that needs to be deflated if this solver has taken any steps.
            if (curDim) {
              Teuchos::RCP<MV> update = block_gmres_iter->getCurrentUpdate();
              Teuchos::RCP<MV> defUpdate = MVT::CloneViewNonConst( *update, defRHSIdx );

              // Set the deflated indices so we can update the solution.
              problem_->setLSIndex( convIdx );

              // Update the linear problem.
              problem_->updateSolution( defUpdate, true );
            }

            // Set the remaining indices after deflation.
            problem_->setLSIndex( currRHSIdx );

            // Set the dimension of the subspace, which is the same as the old subspace size.
            defState.curDim = curDim;

            // Initialize the solver with the deflated system.
            block_gmres_iter->initialize(defState);
          }
          //
          // check for maximum iterations
          //
          else if ( maxIterTest_->getStatus() == Passed ) {
            // we don't have convergence
            isConverged = false;
            break;  // break from while(1){block_gmres_iter->iterate()}
          }
          //
          // check for restarting, i.e. the subspace is full
          //
          else if ( block_gmres_iter->getCurSubspaceDim() == block_gmres_iter->getMaxSubspaceDim() ) {

            if ( numRestarts >= maxRestarts_ ) {
              isConverged = false;
              break; // break from while(1){block_gmres_iter->iterate()}
            }
            numRestarts++;

            printer_->stream(Debug) << " Performing restart number " << numRestarts << " of " << maxRestarts_ << std::endl << std::endl;

            // Update the linear problem.
            Teuchos::RCP<MV> update = block_gmres_iter->getCurrentUpdate();
            problem_->updateSolution( update, true );

            // Get the state.
            PseudoBlockGmresIterState<ScalarType,MV> oldState = block_gmres_iter->getState();

            // Set the new state.
            PseudoBlockGmresIterState<ScalarType,MV> newstate;
            newstate.V.resize(currRHSIdx.size());
            newstate.Z.resize(currRHSIdx.size());

            // Compute the restart vectors
            // NOTE: Force the linear problem to update the current residual since the solution was updated.
            R_0 = MVT::Clone( *(problem_->getInitPrecResVec()), currRHSIdx.size() );
            problem_->computeCurrPrecResVec( &*R_0 );
            for (unsigned int i=0; i<currRHSIdx.size(); ++i) {
              index[0] = i;  // index(1) vector declared on line 891

              tmpV = MVT::CloneViewNonConst( *R_0, index );

              // Get a matrix to hold the orthonormalization coefficients.
              Teuchos::RCP<Teuchos::SerialDenseVector<int,ScalarType> > tmpZ
                = Teuchos::rcp( new Teuchos::SerialDenseVector<int,ScalarType>( 1 ));

              // Orthonormalize the new V_0
              int rank = ortho_->normalize( *tmpV, tmpZ );
              TEUCHOS_TEST_FOR_EXCEPTION(rank != 1 ,PseudoBlockGmresSolMgrOrthoFailure,
                  "Belos::PseudoBlockGmresSolMgr::solve(): Failed to compute initial block of orthonormal vectors after the restart.");

              newstate.V[i] = tmpV;
              newstate.Z[i] = tmpZ;
            }

            // Initialize the solver.
            newstate.curDim = 0;
            block_gmres_iter->initialize(newstate);

          } // end of restarting

          //
          // we returned from iterate(), but none of our status tests Passed.
          // something is wrong, and it is probably our fault.
          //

          else {
            TEUCHOS_TEST_FOR_EXCEPTION(true,std::logic_error,
                "Belos::PseudoBlockGmresSolMgr::solve(): Invalid return from PseudoBlockGmresIter::iterate().");
          }
        }
        catch (const PseudoBlockGmresIterOrthoFailure &e) {

          // Try to recover the most recent least-squares solution
          block_gmres_iter->updateLSQR( block_gmres_iter->getCurSubspaceDim() );

          // Check to see if the most recent least-squares solution yielded convergence.
          sTest_->checkStatus( &*block_gmres_iter );
          if (convTest_->getStatus() != Passed)
            isConverged = false;
          break;
        }
        catch (const StatusTestNaNError& e) {
          // A NaN was detected in the solver.  Set the solution to zero and return unconverged.
          achievedTol_ = MT::one();
          Teuchos::RCP<MV> X = problem_->getLHS();
          MVT::MvInit( *X, SCT::zero() );
          printer_->stream(Warnings) << "Belos::PseudoBlockGmresSolMgr::solve(): Warning! NaN has been detected!" 
                                     << std::endl;
          return Unconverged;
        }
        catch (const std::exception &e) {
          printer_->stream(Errors) << "Error! Caught std::exception in PseudoBlockGmresIter::iterate() at iteration "
                                   << block_gmres_iter->getNumIters() << std::endl
                                   << e.what() << std::endl;
          throw;
        }
      }

      // Compute the current solution.
      // Update the linear problem.
      if (nonnull(userConvStatusTest_)) {
        //std::cout << "\nnonnull(userConvStatusTest_)\n";
        Teuchos::RCP<MV> update = block_gmres_iter->getCurrentUpdate();
        problem_->updateSolution( update, true );
      }
      else if (nonnull(expConvTest_->getSolution())) {
        //std::cout << "\nexpConvTest_->getSolution()\n";
        Teuchos::RCP<MV> newX = expConvTest_->getSolution();
        Teuchos::RCP<MV> curX = problem_->getCurrLHSVec();
        MVT::MvAddMv( 0.0, *newX, 1.0, *newX, *curX );
      }
      else {
        //std::cout << "\nblock_gmres_iter->getCurrentUpdate()\n";
        Teuchos::RCP<MV> update = block_gmres_iter->getCurrentUpdate();
        problem_->updateSolution( update, true );
      }

      // Inform the linear problem that we are finished with this block linear system.
      problem_->setCurrLS();

      // Update indices for the linear systems to be solved.
      startPtr += numCurrRHS;
      numRHS2Solve -= numCurrRHS;
      if ( numRHS2Solve > 0 ) {
        numCurrRHS = ( numRHS2Solve < blockSize_) ? numRHS2Solve : blockSize_;

        blockSize_ = numCurrRHS;
        currIdx.resize( numCurrRHS  );
        for (int i=0; i<numCurrRHS; ++i)
        { currIdx[i] = startPtr+i; }

        // Adapt the status test quorum if we need to.
        if (defQuorum_ > blockSize_) {
          if (impConvTest_ != Teuchos::null)
            impConvTest_->setQuorum( blockSize_ );
          if (expConvTest_ != Teuchos::null)
            expConvTest_->setQuorum( blockSize_ );
        }

        // Set the next indices.
        problem_->setLSIndex( currIdx );
      }
      else {
        currIdx.resize( numRHS2Solve );
      }

    }// while ( numRHS2Solve > 0 )

  }

  // print final summary
  sTest_->print( printer_->stream(FinalSummary) );

  // print timing information
#ifdef BELOS_TEUCHOS_TIME_MONITOR
  // Calling summarize() can be expensive, so don't call unless the
  // user wants to print out timing details.  summarize() will do all
  // the work even if it's passed a "black hole" output stream.
  if (verbosity_ & TimingDetails)
    Teuchos::TimeMonitor::summarize( printer_->stream(TimingDetails) );
#endif

  // get iteration information for this solve
  numIters_ = maxIterTest_->getNumIters();

  // Save the convergence test value ("achieved tolerance") for this
  // solve.  For this solver, convTest_ may either be a single
  // residual norm test, or a combination of two residual norm tests.
  // In the latter case, the master convergence test convTest_ is a
  // SEQ combo of the implicit resp. explicit tests.  If the implicit
  // test never passes, then the explicit test won't ever be executed.
  // This manifests as expConvTest_->getTestValue()->size() < 1.  We
  // deal with this case by using the values returned by
  // impConvTest_->getTestValue().
  {
    // We'll fetch the vector of residual norms one way or the other.
    const std::vector<MagnitudeType>* pTestValues = NULL;
    if (expResTest_) {
      pTestValues = expConvTest_->getTestValue();
      if (pTestValues == NULL || pTestValues->size() < 1) {
        pTestValues = impConvTest_->getTestValue();
      }
    }
    else {
      // Only the implicit residual norm test is being used.
      pTestValues = impConvTest_->getTestValue();
    }
    TEUCHOS_TEST_FOR_EXCEPTION(pTestValues == NULL, std::logic_error,
      "Belos::PseudoBlockGmresSolMgr::solve(): The implicit convergence test's "
      "getTestValue() method returned NULL.  Please report this bug to the "
      "Belos developers.");
    TEUCHOS_TEST_FOR_EXCEPTION(pTestValues->size() < 1, std::logic_error,
      "Belos::PseudoBlockGmresSolMgr::solve(): The implicit convergence test's "
      "getTestValue() method returned a vector of length zero.  Please report "
      "this bug to the Belos developers.");

    // FIXME (mfh 12 Dec 2011) Does pTestValues really contain the
    // achieved tolerances for all vectors in the current solve(), or
    // just for the vectors from the last deflation?
    achievedTol_ = *std::max_element (pTestValues->begin(), pTestValues->end());
  }

  if (!isConverged || loaDetected_) {
    return Unconverged; // return from PseudoBlockGmresSolMgr::solve()
  }
  return Converged; // return from PseudoBlockGmresSolMgr::solve()
}


template<class ScalarType, class MV, class OP>
std::string PseudoBlockGmresSolMgr<ScalarType,MV,OP>::description () const
{
  std::ostringstream out;

  out << "\"Belos::PseudoBlockGmresSolMgr\": {";
  if (this->getObjectLabel () != "") {
    out << "Label: " << this->getObjectLabel () << ", ";
  }
  out << "Num Blocks: " << numBlocks_
      << ", Maximum Iterations: " << maxIters_
      << ", Maximum Restarts: " << maxRestarts_
      << ", Convergence Tolerance: " << convtol_
      << "}";
  return out.str ();
}


template<class ScalarType, class MV, class OP>
void
PseudoBlockGmresSolMgr<ScalarType, MV, OP>::
describe (Teuchos::FancyOStream &out,
          const Teuchos::EVerbosityLevel verbLevel) const
{
  using Teuchos::TypeNameTraits;
  using Teuchos::VERB_DEFAULT;
  using Teuchos::VERB_NONE;
  using Teuchos::VERB_LOW;
  // using Teuchos::VERB_MEDIUM;
  // using Teuchos::VERB_HIGH;
  // using Teuchos::VERB_EXTREME;
  using std::endl;

  // Set default verbosity if applicable.
  const Teuchos::EVerbosityLevel vl =
    (verbLevel == VERB_DEFAULT) ? VERB_LOW : verbLevel;

  if (vl != VERB_NONE) {
    Teuchos::OSTab tab0 (out);

    out << "\"Belos::PseudoBlockGmresSolMgr\":" << endl;
    Teuchos::OSTab tab1 (out);
    out << "Template parameters:" << endl;
    {
      Teuchos::OSTab tab2 (out);
      out << "ScalarType: " << TypeNameTraits<ScalarType>::name () << endl
          << "MV: " << TypeNameTraits<MV>::name () << endl
          << "OP: " << TypeNameTraits<OP>::name () << endl;
    }
    if (this->getObjectLabel () != "") {
      out << "Label: " << this->getObjectLabel () << endl;
    }
    out << "Num Blocks: " << numBlocks_ << endl
        << "Maximum Iterations: " << maxIters_ << endl
        << "Maximum Restarts: " << maxRestarts_ << endl
        << "Convergence Tolerance: " << convtol_ << endl;
  }
}

} // end Belos namespace

#endif /* BELOS_PSEUDO_BLOCK_GMRES_SOLMGR_HPP */