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/*
* Distributed under the OSI-approved Apache License, Version 2.0. See
* accompanying file Copyright.txt for details.
*
* CppReader.cpp
*
* Created on: Jan 26, 2018
* Author: William F Godoy godoywf@ornl.gov
*/
#include <adios2.h>
#include <mpi.h>
#include <iostream>
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);
if (rank == 0)
{
/** ADIOS class factory of IO class objects */
adios2::ADIOS adios(MPI_COMM_SELF);
/*** IO class object: settings and factory of Settings: Variables,
* Parameters, Transports, and Execution: Engines */
adios2::IO bpIO = adios.DeclareIO("CppReader");
/** Engine derived class, spawned to start IO operations */
adios2::Engine bpReader = bpIO.Open("FWriter.bp", adios2::Mode::Read);
bpReader.BeginStep();
const std::map<std::string, adios2::Params> variables = bpIO.AvailableVariables();
for (const auto &variablePair : variables)
{
std::cout << "Name: " << variablePair.first;
for (const auto ¶meter : variablePair.second)
{
std::cout << "\t" << parameter.first << ": " << parameter.second << "\n";
}
}
auto bpData = bpIO.InquireVariable<float>("data2D");
bpData.SetSelection({{1, 1}, {3, 2}});
std::vector<float> data(bpData.SelectionSize());
bpReader.Get(bpData, data.data());
bpReader.EndStep();
std::cout << "Selection size: " << bpData.SelectionSize() << "\n";
for (size_t i = 0; i < bpData.Count()[0]; ++i)
{
for (size_t j = 0; j < bpData.Count()[1]; ++j)
{
std::cout << data[i * bpData.Count()[1] + j] << " ";
}
std::cout << "\n";
}
std::cout << "\n";
bpReader.Close();
}
MPI_Finalize();
return 0;
}
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