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/*
* Distributed under the OSI-approved Apache License, Version 2.0. See
* accompanying file Copyright.txt for details.
*
* dataSpacesReader.cpp
*
* Created on: Feb 06, 2019
* Author: Pradeep Subedi
* pradeep.subedi@rutgers.edu
*/
#include <chrono>
#include <iostream>
#include <numeric>
#include <thread>
#include <vector>
#include <adios2.h>
#if ADIOS2_USE_MPI
#include <mpi.h>
#endif
int main(int argc, char *argv[])
{
int rank;
int size;
#if ADIOS2_USE_MPI
int provided;
// MPI_THREAD_MULTIPLE is only required if you enable the SST MPI_DP
MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &provided);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
#else
rank = 0;
size = 1;
#endif
std::vector<float> myFloats(10);
try
{
#if ADIOS2_USE_MPI
adios2::ADIOS adios(MPI_COMM_WORLD);
#else
adios2::ADIOS adios;
#endif
adios2::IO dataSpacesIO = adios.DeclareIO("myIO");
dataSpacesIO.SetEngine("DATASPACES");
adios2::Engine dataSpacesReader = dataSpacesIO.Open("helloDataSpaces", adios2::Mode::Read);
dataSpacesReader.BeginStep();
adios2::Variable<float> bpFloats = dataSpacesIO.InquireVariable<float>("bpFloats");
std::cout << "Incoming variable is of size " << bpFloats.Shape()[0] << "\n";
const std::size_t total_size = bpFloats.Shape()[0];
const std::size_t my_start = (total_size / size) * rank;
const std::size_t my_count = (total_size / size);
std::cout << "Reader rank " << rank << " reading " << my_count
<< " floats starting at element " << my_start << "\n";
const adios2::Dims start{my_start};
const adios2::Dims count{my_count};
const adios2::Box<adios2::Dims> sel(start, count);
std::vector<float> myFloats;
myFloats.resize(my_count);
bpFloats.SetSelection(sel);
dataSpacesReader.Get(bpFloats, myFloats.data());
dataSpacesReader.EndStep();
dataSpacesReader.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";
}
#if ADIOS2_USE_MPI
MPI_Finalize();
#endif
return 0;
}
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