ParallelColumnDataWriter.cpp

/*

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*/

#include "ParallelColumnDataWriter.hpp"
#include "Exception.hpp"
#include "DistributedVectorFactory.hpp"

ParallelColumnDataWriter::ParallelColumnDataWriter(const std::string& rDirectory,
                                                   const std::string& rBaseName,
                                                   bool cleanDirectory)
    : ColumnDataWriter(rDirectory, rBaseName, cleanDirectory),
      mConcentrated(nullptr)
{
    int num_procs;
    MPI_Comm_size(PETSC_COMM_WORLD, &num_procs);
    if (num_procs==1)
    {
        mIsParallel = false;
    }
    else
    {
        mIsParallel = true;
    }
}

void ParallelColumnDataWriter::PutVector(int variableID, Vec petscVector)
{
    int size;
    VecGetSize(petscVector,&size);

    if (size != mFixedDimensionSize)
    {
        EXCEPTION("Size of vector does not match FixedDimensionSize.");
    }

    // Construct the appropriate "scatter" object to concentrate the vector on the master
    if (mConcentrated==nullptr)
    {
        VecScatterCreateToZero(petscVector, &mToMaster, &mConcentrated);
    }

//    int size2;
//    VecGetSize(mConcentrated, &size2);
//    std::cout << "Vector size=" << size << "," << size2 << std::endl << std::flush;

//PETSc-3.x.x or PETSc-2.3.3
#if ((PETSC_VERSION_MAJOR == 3) || (PETSC_VERSION_MAJOR == 2 && PETSC_VERSION_MINOR == 3 && PETSC_VERSION_SUBMINOR == 3)) //2.3.3 or 3.x.x
    VecScatterBegin(mToMaster, petscVector, mConcentrated, INSERT_VALUES, SCATTER_FORWARD);
    VecScatterEnd(mToMaster, petscVector, mConcentrated, INSERT_VALUES, SCATTER_FORWARD);
#else
    VecScatterBegin(petscVector, mConcentrated, INSERT_VALUES, SCATTER_FORWARD, mToMaster);
    VecScatterEnd(petscVector, mConcentrated, INSERT_VALUES, SCATTER_FORWARD, mToMaster);
#endif

//    std::cout << "Done scatter" << std::endl << std::flush;

    if (PetscTools::AmMaster())
    {
        double *concentrated_vector;
        VecGetArray(mConcentrated, &concentrated_vector);
        for (int i=0; i<size; i++)
        {
            ColumnDataWriter::PutVariable(variableID, concentrated_vector[i], i);
        }
        VecRestoreArray(mConcentrated, &concentrated_vector);
    }
}

void ParallelColumnDataWriter::PutVectorStripe(int variableId, DistributedVector::Stripe& rStripe)
{
    // Put the stripe into its own 'unstriped' vector
    DistributedVectorFactory* p_factory = rStripe.GetFactory();
    Vec unstriped_petsc = p_factory->CreateVec();
    DistributedVector unstriped = p_factory->CreateDistributedVector(unstriped_petsc);
    for (DistributedVector::Iterator index = unstriped.Begin();
         index!= unstriped.End();
         ++index)
    {
        unstriped[index] = rStripe[index];
    }

    // Put the unstriped vector
    ParallelColumnDataWriter::PutVector(variableId, unstriped_petsc);
    PetscTools::Destroy(unstriped_petsc);
}

void ParallelColumnDataWriter::EndDefineMode()
{
    if (PetscTools::AmMaster())
    {
        ColumnDataWriter::EndDefineMode();
    }
    else
    {
        mIsInDefineMode = false;
    }
}

void ParallelColumnDataWriter::PutVariable(int variableID, double variableValue, long dimensionPosition)
{
    if (PetscTools::AmMaster())
    {
        // Master process is allowed to write
        ColumnDataWriter::PutVariable(variableID, variableValue, dimensionPosition);
    }
}

ParallelColumnDataWriter::~ParallelColumnDataWriter()
{
    if (mConcentrated != nullptr)
    {
        VecScatterDestroy(PETSC_DESTROY_PARAM(mToMaster));
        PetscTools::Destroy(mConcentrated);
    }
    Close();
}

void ParallelColumnDataWriter::AdvanceAlongUnlimitedDimension()
{
    // Paranoia
    PetscTools::Barrier("ParallelColumnDataWriter::AdvanceAlongUnlimitedDimension");

    if (PetscTools::AmMaster())
    {
        ColumnDataWriter::DoAdvanceAlongUnlimitedDimension();
    }
}

void ParallelColumnDataWriter::Close()
{
    // Paranoia
    PetscTools::Barrier("ParallelColumnDataWriter::Close");

    if (PetscTools::AmMaster())
    {
        ColumnDataWriter::Close();
    }
}