Teuchos_MPISession.cpp

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//                    Teuchos: Common Tools Package
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#include "Teuchos_MPISession.hpp"
#include "Teuchos_Assert.hpp"

using namespace Teuchos;

int MPISession::rank_ = 0 ;
int MPISession::nProc_ = 1 ;

void MPISession::init(int* argc, void*** argv)
{
#ifdef HAVE_MPI
  /* initialize MPI */
  int mpiHasBeenStarted = 0;
  MPI_Initialized(& mpiHasBeenStarted);
  int mpierr = 0 ;
  if (!mpiHasBeenStarted)
    {
      mpierr = ::MPI_Init (argc, (char ***) argv);
      TEUCHOS_TEST_FOR_EXCEPTION(mpierr != 0, std::runtime_error,
                         "Error code=" << mpierr
                         << " detected in MPI_Init()");
    }
  
  /* find rank */
  mpierr = ::MPI_Comm_rank (MPI_COMM_WORLD, &rank_);
  TEUCHOS_TEST_FOR_EXCEPTION(mpierr != 0, std::runtime_error,
                     "Error code=" << mpierr
                     << " detected in MPI_Comm_rank()");

  /* find number of procs */
  mpierr = ::MPI_Comm_size (MPI_COMM_WORLD, &nProc_);

  TEUCHOS_TEST_FOR_EXCEPTION(mpierr != 0, std::runtime_error,
                     "Error code=" << mpierr
                     << " detected in MPI_Comm_size()");

  /* get machine name */
  int nameLen;
  char procName[MPI_MAX_PROCESSOR_NAME];
  mpierr = ::MPI_Get_processor_name(procName,&nameLen);

  TEUCHOS_TEST_FOR_EXCEPTION(mpierr != 0, std::runtime_error,
                     "Error code=" << mpierr
                     << " detected in MPI_Get_processor_name()");

  if (showStartupMessage())
    {
      std::cerr << "Teuchos::MPISession::init() started processor "
           << procName << std::endl;
    }
  else
    {
#else
  std::cerr << "Teuchos::MPISession::init() started serial run" << std::endl;
#endif
#ifdef HAVE_MPI
    }
#endif
}

void MPISession::finalize()
{
#ifdef HAVE_MPI
  int mpierr = ::MPI_Finalize();

  TEUCHOS_TEST_FOR_EXCEPTION(mpierr != 0, std::runtime_error,
                     "Error code=" << mpierr << " detected in MPI_Finalize()");
#endif
}