MueLu_VerboseObject.cpp

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//        MueLu: A package for multigrid based preconditioning
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#include "MueLu_VerboseObject.hpp"

#include <fstream>
#ifdef HAVE_MPI
#include <mpi.h>
#endif

#include <Teuchos_VerboseObject.hpp>

#include "MueLu_ConfigDefs.hpp"
#include "MueLu_VerbosityLevel.hpp"
#include "MueLu_Exceptions.hpp"

namespace MueLu {

  VerboseObject::VerboseObject():
    verbLevel_(NotSpecified), // = use global verbose level by default
    numProcs_(0)
  {
    // Note: using MPI_COMM_RANK is bad idea (because a subcommunicator may be used to run MueLu)
    // Belos have the same problem in the class BelosOutputManager.
    //
    // How to fix this: the FancyOStream provides setProcRankAndSize() to change the proc rank info used by setOutputToRootOnly().
    // Adding a method FancyOStream::getProcRank() would be enough. And it makes sense to use the info that come from the stream configuration.
    //
    // Documentation: after the patch, it migh be nice to add to the documentation (Teuchos and MueLu)
    //                that users of subcommunicators have to setup the output stream (of Teuchos::VerboseObject) separately.
    procRank_ = 0;
#ifdef HAVE_MPI
    int mpiStarted = 0; MPI_Initialized(&mpiStarted);
    if (mpiStarted)     {
      MPI_Comm_rank(MPI_COMM_WORLD, &procRank_);
      MPI_Comm_size(MPI_COMM_WORLD, &numProcs_);
    }
#endif
    }

  VerboseObject::~VerboseObject() { }

  VerbLevel VerboseObject::GetVerbLevel() const {
    return (verbLevel_ != NotSpecified ?  verbLevel_ : globalVerbLevel_);
  }

  void VerboseObject::SetVerbLevel(const VerbLevel verbLevel) {
    verbLevel_ = verbLevel;
  }

  int VerboseObject::GetProcRankVerbose() const {
    return procRank_;
  }

  int VerboseObject::SetProcRankVerbose(int procRank) const {
    int oldRank = procRank_;
    procRank_ = procRank;
    return oldRank;
  }

  bool VerboseObject::IsPrint(MsgType type, int thisProcRankOnly) const {
    return ((type & GetVerbLevel()) && (thisProcRankOnly < 0 || procRank_ == thisProcRankOnly));
  }

  Teuchos::FancyOStream & VerboseObject::GetOStream(MsgType type, int thisProcRankOnly) const {
    if (!IsPrint(type, thisProcRankOnly))
      return *blackHole_;

    Teuchos::FancyOStream& os = *GetMueLuOStream();
    if (!(type & ((Extreme | Test) ^ Warnings)))
      os << "\n******* WARNING *******" << std::endl;

    return os;
  }

  Teuchos::FancyOStream& VerboseObject::GetBlackHole() const {
    return *blackHole_;
  }

  void VerboseObject::SetDefaultVerbLevel(const VerbLevel defaultVerbLevel) {
    TEUCHOS_TEST_FOR_EXCEPTION(defaultVerbLevel == NotSpecified, Exceptions::RuntimeError,
                               "MueLu::VerboseObject::GetVerbLevel(): global verbose level cannot be 'NotSpecified'.");
    globalVerbLevel_ = defaultVerbLevel;
  }

  VerbLevel VerboseObject::GetDefaultVerbLevel() {
    return globalVerbLevel_;
  }

  void VerboseObject::SetMueLuOStream(const Teuchos::RCP<Teuchos::FancyOStream>& mueluOStream) {
    mueluOStream->setOutputToRootOnly(-1);
    mueluOutputStream_ = mueluOStream;
  }

  void VerboseObject::SetMueLuOFileStream(const std::string& filename) {
    std::string fn;
#ifdef HAVE_MPI
    int mpiStarted = 0; MPI_Initialized(&mpiStarted);
    if (mpiStarted)     {
      int procRank;
      MPI_Comm_rank(MPI_COMM_WORLD, &procRank);
      fn = filename + "." + std::to_string(procRank);
    } else
#endif
      fn = filename;
    RCP<std::ofstream> outFile(new std::ofstream(fn));
    Teuchos::RCP<Teuchos::FancyOStream> fancyOutFile = Teuchos::fancyOStream(Teuchos::rcp_implicit_cast<std::ostream>(outFile));
    SetMueLuOStream(fancyOutFile);
  }

  Teuchos::RCP<Teuchos::FancyOStream> VerboseObject::GetMueLuOStream() {
    if (mueluOutputStream_.get()==NULL) {
      mueluOutputStream_ = fancyOStream(rcpFromRef(std::cout));
      mueluOutputStream_->setOutputToRootOnly(-1);
    }
    return mueluOutputStream_;
  }

  VerbLevel VerboseObject::globalVerbLevel_ = High; // Default global verbose level.

  RCP<Teuchos::FancyOStream> VerboseObject::blackHole_ = Teuchos::getFancyOStream(rcp(new Teuchos::oblackholestream()));

  RCP<Teuchos::FancyOStream> VerboseObject::mueluOutputStream_ = Teuchos::null;

} // namespace MueLu