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/*
* Distributed under the OSI-approved Apache License, Version 2.0. See
* accompanying file Copyright.txt for details.
*
* helloBPWriteStep.cpp example for writing a variable using the Advance
* function for time aggregation. Time step is saved as an additional (global)
* single value variable, just for tracking purposes.
*
* Created on: Feb 16, 2017
* Author: William F Godoy godoywf@ornl.gov
*/
#include <algorithm> //std::for_each
#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[])
{
MPI_Init(&argc, &argv);
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};
const std::size_t Nx = myFloats.size();
try
{
/** ADIOS class factory of IO class objects, DebugON is recommended */
adios2::ADIOS adios(MPI_COMM_WORLD, adios2::DebugON);
/*** IO class object: settings and factory of Settings: Variables,
* Parameters, Transports, and Execution: Engines */
adios2::IO &bpIO = adios.DeclareIO("BPFile_N2N");
bpIO.SetParameters({{"Threads", "2"}});
/** global array: name, { shape (total dimensions) }, { start
* (local) },
* { count (local) }, all are constant dimensions */
adios2::Variable<float> &bpFloats = bpIO.DefineVariable<float>(
"bpFloats", {size * Nx}, {rank * Nx}, {Nx}, adios2::ConstantDims,
myFloats.data());
adios2::Variable<int> &bpInts =
bpIO.DefineVariable<int>("bpInts", {size * Nx}, {rank * Nx}, {Nx},
adios2::ConstantDims, myInts.data());
/** Engine derived class, spawned to start IO operations */
adios2::Engine &bpWriter =
bpIO.Open("myWriteStep.bp", adios2::Mode::Write);
for (unsigned int timeStep = 0; timeStep < 10; ++timeStep)
{
myFloats[0] = timeStep;
myInts[0] = timeStep;
bpWriter.WriteStep();
}
bpWriter.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;
}