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/*
* Distributed under the OSI-approved Apache License, Version 2.0. See
* accompanying file Copyright.txt for details.
*
* hdf5Writer.cpp: Simple self-descriptive example of how to write a
* variable to a parallel HDF5 File using MPI processes.
*
* Created on: March 20, 2017
* Author: Junmin
*/
#include <ios> //std::ios_base::failure
#include <iostream> //std::cout
#include <mpi.h>
#include <stdexcept> //std::invalid_argument std::exception
#include <vector>
#include <adios2.h>
int main(int argc, char *argv[])
{
int provided;
// MPI_THREAD_MULTIPLE is only required if you enable the SST MPI_DP
MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &provided);
int rank, size;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
/** Application variable */
std::vector<float> myFloats = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
std::vector<int> myInts = {0, -1, -2, -3, -4, -5, -6, -7, -8, -9};
double myScalar = 1.234;
const std::size_t Nx = myFloats.size();
try
{
/** ADIOS class factory of IO class objects */
adios2::ADIOS adios(MPI_COMM_WORLD);
/*** IO class object: settings and factory of Settings: Variables,
* Parameters, Transports, and Execution: Engines */
adios2::IO hdf5IO = adios.DeclareIO("HDFFileIO");
hdf5IO.SetEngine("HDF5");
hdf5IO.SetParameter("IdleH5Writer",
"true"); // set this if not all ranks are writting
/** global array : name, { shape (total) }, { start (local) }, { count
* (local) }, all are constant dimensions */
adios2::Variable<float> h5Floats = hdf5IO.DefineVariable<float>(
"h5Floats", {size * Nx}, {rank * Nx}, {Nx}, adios2::ConstantDims);
adios2::Variable<int> h5Ints = hdf5IO.DefineVariable<int>(
"h5Ints", {size * Nx}, {rank * Nx}, {Nx}, adios2::ConstantDims);
adios2::Variable<double> h5ScalarDouble = hdf5IO.DefineVariable<double>("h5ScalarDouble");
/** Engine derived class, spawned to start IO operations */
adios2::Engine hdf5Writer = hdf5IO.Open("myVector.h5", adios2::Mode::Write);
#ifdef ALL_RANKS_WRITE
// all Ranks must call Put
/** Write variable for buffering */
hdf5Writer.Put<float>(h5Floats, myFloats.data());
hdf5Writer.Put(h5Ints, myInts.data());
hdf5Writer.Put(h5ScalarDouble, &myScalar);
#else
// using collective Begin/EndStep() to run the
// collective HDF5 calls. Now Ranks can skip writting if no data
// presented
hdf5Writer.BeginStep();
if (rank == 0)
{
hdf5Writer.Put<float>(h5Floats, myFloats.data());
hdf5Writer.Put(h5Ints, myInts.data());
hdf5Writer.Put(h5ScalarDouble, &myScalar);
}
hdf5Writer.EndStep();
#endif
std::vector<int64_t> m_globalDims = {10, 20, 30, 40};
hdf5IO.DefineAttribute<std::string>("adios2_schema/version_major",
std::to_string(ADIOS2_VERSION_MAJOR));
hdf5IO.DefineAttribute<std::string>("adios2_schema/version_minor",
std::to_string(ADIOS2_VERSION_MINOR));
hdf5IO.DefineAttribute<std::string>("/adios2_schema/mesh/type", "explicit");
hdf5IO.DefineAttribute<std::int64_t>("adios2_schema/mesh/dimension0", m_globalDims[0]);
hdf5IO.DefineAttribute<std::int64_t>("adios2_schema/mesh/dimension1", m_globalDims[1]);
hdf5IO.DefineAttribute<std::int64_t>("adios2_schema/mesh/dimension2", m_globalDims[2]);
hdf5IO.DefineAttribute<std::int64_t>("adios2_schema/mesh/dimension3", m_globalDims[3]);
hdf5IO.DefineAttribute<std::int64_t>("adios2_schema/mesh/dimension-num",
m_globalDims.size());
hdf5Writer.Close();
}
catch (std::invalid_argument &e)
{
std::cout << "Invalid argument exception, STOPPING PROGRAM from rank " << rank << "\n";
std::cout << e.what() << "\n";
}
catch (std::ios_base::failure &e)
{
std::cout << "IO System base failure exception, STOPPING PROGRAM from rank " << rank
<< "\n";
std::cout << e.what() << "\n";
}
catch (std::exception &e)
{
std::cout << "Exception, STOPPING PROGRAM from rank " << rank << "\n";
std::cout << e.what() << "\n";
}
MPI_Finalize();
return 0;
}
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