C++ DataContainer::getElement方法代码示例

//.........这里部分代码省略.........
        dc.getMPISize(file_mpi_size);
        std::cout << mpi_rank << ": total file MPI size = " <<
                file_mpi_size.toString() << std::endl;

        for (int i = 0; i < 3; ++i)
            f_mpi_size[i] = file_mpi_size[i];

        dc.close();
    }
    MPI_Bcast(f_mpi_size, 3, MPI_UNSIGNED_LONG_LONG, 0, MPI_COMM_WORLD);
    file_mpi_size.set(f_mpi_size[0], f_mpi_size[1], f_mpi_size[2]);

    // get number of files for this MPI process
    filesToProcesses(mpi_size, mpi_rank, file_mpi_size.getScalarSize(),
            files_start, files_end);

    for (int f = files_start; f <= files_end; ++f)
    {
        // get file MPI pos for this file index
        indexToPos(f, file_mpi_size, fAttr.mpiPosition);
        std::cout << mpi_rank << ": opening position " <<
                fAttr.mpiPosition.toString() << std::endl;

        dc.open(filename.c_str(), fAttr);

        // get number of entries
        int32_t *ids = NULL;
        size_t num_ids = 0;
        dc.getEntryIDs(NULL, &num_ids);

        if (num_ids == 0)
        {
            dc.close();
            continue;
        } else
        {
            ids = new int32_t[num_ids];
            dc.getEntryIDs(ids, &num_ids);
        }

        // get entries for 1. id (iteration)
        DataCollector::DCEntry *entries = NULL;
        size_t num_entries = 0;
        dc.getEntriesForID(ids[0], NULL, &num_entries);

        if (num_entries == 0)
        {
            delete[] ids;
            dc.close();
            continue;
        } else
        {
            entries = new DataCollector::DCEntry[num_entries];
            dc.getEntriesForID(ids[0], entries, &num_entries);
        }

        // read 1. entry
        DataCollector::DCEntry first_entry = entries[0];
        std::cout << "  " << mpi_rank << ": reading entry " << first_entry.name << std::endl;

        // read complete domain
        Domain domain = dc.getGlobalDomain(ids[0], first_entry.name.c_str());
        DomainCollector::DomDataClass dataClass = DomainCollector::UndefinedType;
        DataContainer* container = dc.readDomain(ids[0], first_entry.name.c_str(),
                domain, &dataClass, false);

        // access all elements, no matter how many subdomains
        for (size_t i = 0; i < container->getNumElements(); ++i)
        {
            void *element = container->getElement(i);
            // do anything with this element
            // ...
        }

        // POLY data might be distributed over multiple subdomains
        for (size_t d = 0; d < container->getNumSubdomains(); ++d)
        {
            DomainData* subdomain = container->getIndex(d);
            Dimensions size = subdomain->getSize();

            std::cout << "  " << mpi_rank << ": subdomain " << d << " has size " <<
                    size.toString() << std::endl;

            // access the underlying buffer of a subdomain
            void *elements = subdomain->getData();
        }

        // don't forget to delete the container allocated by DomainCollector
        delete container;

        delete[] entries;
        delete[] ids;

        dc.close();
    }

    MPI_Finalize();

    return 0;
}

void DomainsTest::subTestGridDomains(const Dimensions mpiSize, const Dimensions gridSize,
        uint32_t rank, uint32_t iteration)
{
    int max_rank = 1;
    for (int i = 0; i < rank; i++)
        max_rank *= mpiSize[i];

    int mpi_rank = totalMpiRank;

    if (mpi_rank < max_rank)
    {
        // write data
        int *data_write = new int[gridSize.getDimSize()];

        // initialize data for writing with mpi index (mpi rank)
        Dimensions mpi_position(mpi_rank % mpiSize[0],
                (mpi_rank / mpiSize[0]) % mpiSize[1],
                (mpi_rank / mpiSize[0]) / mpiSize[1]);

        for (size_t i = 0; i < gridSize.getDimSize(); ++i)
            data_write[i] = mpi_rank;

        DataCollector::FileCreationAttr fattr;
        fattr.fileAccType = DataCollector::FAT_CREATE;
        fattr.mpiSize.set(mpiSize);
        fattr.mpiPosition.set(mpi_position);

        dataCollector->open(hdf5_file_grid, fattr);

        Dimensions domain_offset = mpi_position * gridSize;

#if defined TESTS_DEBUG
        std::cout << "writing..." << std::endl;
        std::cout << "mpi_position = " << mpi_position.toString() << std::endl;
        std::cout << "domain_offset = " << domain_offset.toString() << std::endl;
#endif

        dataCollector->writeDomain(iteration, ctInt, rank, gridSize, "grid_data",
                domain_offset, gridSize, DomainCollector::GridType, data_write);

        dataCollector->close();
        
        int *data_read = new int[gridSize.getDimSize()];
        fattr.fileAccType = DataCollector::FAT_READ;
        
        dataCollector->open(hdf5_file_grid, fattr);
        DomainCollector::DomDataClass data_class = DomainCollector::UndefinedType;
        DataContainer *container = dataCollector->readDomain(iteration, "grid_data",
                domain_offset, gridSize, &data_class, false);
        dataCollector->close();
        
        CPPUNIT_ASSERT(container != NULL);
        CPPUNIT_ASSERT(container->getNumSubdomains() == 1);
        CPPUNIT_ASSERT(container->getNumElements() == gridSize.getDimSize());
        
        for (size_t i = 0; i < gridSize.getDimSize(); ++i)
            CPPUNIT_ASSERT(*((int*)(container->getElement(i))) == mpi_rank);
        
        delete container;
        
        delete[] data_read;

        delete[] data_write;
        data_write = NULL;
    }
    
    MPI_Barrier(MPI_COMM_WORLD);

    if (mpi_rank == 0)
    {
        // now read and test domain subdomains
        DataCollector::FileCreationAttr fattr;
        fattr.fileAccType = DataCollector::FAT_READ_MERGED;
        fattr.mpiSize = mpiSize;
        dataCollector->open(hdf5_file_grid, fattr);

        size_t global_domain_elements = dataCollector->getTotalElements(iteration, "grid_data");
        Dimensions global_grid_size = mpiSize * gridSize;

#if defined TESTS_DEBUG
        std::cout << "global_domain_elements = " << global_domain_elements << std::endl;
        std::cout << "global_grid_size = " << global_grid_size.toString() << std::endl;
#endif

        CPPUNIT_ASSERT(global_domain_elements == global_grid_size.getDimSize());

        // test different domain offsets
        for (uint32_t i = 0; i < 5; ++i)
        {
            Dimensions offset(rand() % global_grid_size[0],
                    rand() % global_grid_size[1],
                    rand() % global_grid_size[2]);

            Dimensions partition_size = global_grid_size - offset;

#if defined TESTS_DEBUG
            std::cout << "offset = " << offset.toString() << std::endl;
            std::cout << "partition_size = " << partition_size.toString() << std::endl;
#endif

//.........这里部分代码省略.........

int main(int argc, char **argv)
{
    if (argc < 2)
    {
        std::cout << "Usage: " << argv[0] << " <libsplash-file-base>" << std::endl;
        return -1;
    }

    // libSplash filename
    std::string filename;
    filename.assign(argv[1]);

    // create DomainCollector
    DomainCollector dc(100);
    DataCollector::FileCreationAttr fAttr;
    DataCollector::initFileCreationAttr(fAttr);

    fAttr.fileAccType = DataCollector::FAT_READ_MERGED;

    dc.open(filename.c_str(), fAttr);

    // get number of entries
    int32_t *ids = NULL;
    size_t num_ids = 0;
    dc.getEntryIDs(NULL, &num_ids);

    if (num_ids == 0)
    {
        dc.close();
        return 1;
    } else
    {
        ids = new int32_t[num_ids];
        dc.getEntryIDs(ids, &num_ids);
    }

    // get entries for 1. id (iteration)
    std::cout << "reading from iteration " << ids[0] << std::endl;
    DataCollector::DCEntry *entries = NULL;
    size_t num_entries = 0;
    dc.getEntriesForID(ids[0], NULL, &num_entries);

    if (num_entries == 0)
    {
        delete[] ids;
        dc.close();
        return 1;
    } else
    {
        entries = new DataCollector::DCEntry[num_entries];
        dc.getEntriesForID(ids[0], entries, &num_entries);
    }

    // read 1. entry from this iteration
    DataCollector::DCEntry first_entry = entries[0];
    std::cout << "reading entry " << first_entry.name << std::endl;

    // read complete domain
    Domain domain = dc.getGlobalDomain(ids[0], first_entry.name.c_str());
    DomainCollector::DomDataClass dataClass = DomainCollector::UndefinedType;
    DataContainer* container = dc.readDomain(ids[0], first_entry.name.c_str(),
            domain, &dataClass, false);

    // access all elements, no matter how many subdomains
    for (size_t i = 0; i < container->getNumElements(); ++i)
    {
        void *element = container->getElement(i);
        // do anything with this element
        // ...
    }

    // POLY data might be distributed over multiple subdomains
    for (size_t d = 0; d < container->getNumSubdomains(); ++d)
    {
        DomainData* subdomain = container->getIndex(d);
        Dimensions size = subdomain->getSize();

        std::cout << "subdomain " << d << " has size " << size.toString() << std::endl;

        // access the underlying buffer of a subdomain
        void *elements = subdomain->getData();
    }

    // don't forget to delete the container allocated by DomainCollector
    delete container;

    delete[] entries;
    delete[] ids;

    dc.close();

    return 0;
}