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/*
* Distributed under the OSI-approved Apache License, Version 2.0. See
* accompanying file Copyright.txt for details.
*
* bpAttributeWriteRead.cpp: Simple self-descriptive example of how to write/read attributes and
* a variable to a BP File that lives in several MPI processes.
*
* Created on: Feb 16, 2017
* Author: William F Godoy godoywf@ornl.gov
*/
#include <ios> //std::ios_base::failure
#include <iostream> //std::cout
#if ADIOS2_USE_MPI
#include <mpi.h>
#endif
#include <stdexcept> //std::invalid_argument std::exception
#include <string>
#include <vector>
#include <adios2.h>
void writer(adios2::ADIOS &adios, int rank, int size, std::vector<float> &myFloats)
{
/*** IO class object: settings and factory of Settings: Variables,
* Parameters, Transports, and Execution: Engines */
adios2::IO bpIO = adios.DeclareIO("BPFile_N2N");
const std::size_t Nx = myFloats.size();
/** global array : name, { shape (total) }, { start (local) }, { count
* (local) }, all are constant dimensions */
adios2::Variable<float> bpFloats = bpIO.DefineVariable<float>(
"bpFloats", {size * Nx}, {rank * Nx}, {Nx}, adios2::ConstantDims);
bpIO.DefineAttribute<std::string>("Single_String", "File generated with ADIOS2");
std::vector<std::string> myStrings = {"one", "two", "three"};
bpIO.DefineAttribute<std::string>("Array_of_Strings", myStrings.data(), myStrings.size());
bpIO.DefineAttribute<double>("Attr_Double", 0.f);
std::vector<double> myDoubles = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
bpIO.DefineAttribute<double>("Array_of_Doubles", myDoubles.data(), myDoubles.size());
/** Engine derived class, spawned to start IO operations */
adios2::Engine bpWriter = bpIO.Open("fileAttributes.bp", adios2::Mode::Write);
bpWriter.BeginStep();
/** Write variable for buffering */
bpWriter.Put<float>(bpFloats, myFloats.data());
bpWriter.EndStep();
/** Create bp file, engine becomes unreachable after this*/
bpWriter.Close();
}
void reader(adios2::ADIOS &adios, int rank, int /*size*/)
{
adios2::IO bpIO = adios.DeclareIO("BPReader");
adios2::Engine bpReader = bpIO.Open("fileAttributes.bp", adios2::Mode::Read);
bpReader.BeginStep();
const auto attributesInfo = bpIO.AvailableAttributes();
for (const auto &attributeInfoPair : attributesInfo)
{
std::cout << "Attribute: " << attributeInfoPair.first;
for (const auto &attributePair : attributeInfoPair.second)
{
std::cout << "\tKey: " << attributePair.first << "\tValue: " << attributePair.second
<< "\n";
}
std::cout << "\n";
}
adios2::Attribute<float> singleString = bpIO.InquireAttribute<float>("Single_String");
if (singleString)
{
std::cout << singleString.Name() << ": " << singleString.Data()[0] << "\n";
}
adios2::Attribute<std::string> arrayOfStrings =
bpIO.InquireAttribute<std::string>("Array_of_Strings");
if (arrayOfStrings)
{
std::cout << arrayOfStrings.Name() << ": ";
for (const auto &value : arrayOfStrings.Data())
{
std::cout << value << " ";
}
std::cout << "\n";
}
adios2::Attribute<double> attrDouble = bpIO.InquireAttribute<double>("Attr_Double");
if (attrDouble)
{
std::cout << attrDouble.Name() << ": " << attrDouble.Data()[0] << "\n";
}
adios2::Attribute<double> arrayOfDoubles = bpIO.InquireAttribute<double>("Array_of_Doubles");
if (arrayOfDoubles)
{
std::cout << arrayOfDoubles.Name() << ": ";
for (const auto &value : arrayOfDoubles.Data())
{
std::cout << value << " ";
}
std::cout << "\n";
}
adios2::Variable<float> bpFloats = bpIO.InquireVariable<float>("bpFloats");
const std::size_t Nx = 10;
std::vector<float> myFloats(Nx);
if (bpFloats)
{
bpFloats.SetSelection({{Nx * rank}, {Nx}});
bpReader.Get(bpFloats, myFloats.data());
}
bpReader.EndStep();
bpReader.Close();
}
int main(int argc, char *argv[])
{
int rank, 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
/** Application variable */
std::vector<float> myFloats = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
try
{
/** ADIOS class factory of IO class objects */
#if ADIOS2_USE_MPI
adios2::ADIOS adios(MPI_COMM_WORLD);
#else
adios2::ADIOS adios;
#endif
writer(adios, rank, size, myFloats);
reader(adios, rank, size);
}
catch (std::invalid_argument &e)
{
std::cout << "Invalid argument exception, STOPPING PROGRAM from rank " << rank << "\n";
std::cout << e.what() << "\n";
#if ADIOS2_USE_MPI
std::cerr << "STOPPING PROGRAM from rank " << rank << "\n";
MPI_Abort(MPI_COMM_WORLD, 1);
#endif
}
catch (std::ios_base::failure &e)
{
std::cout << "IO System base failure exception, STOPPING PROGRAM from rank " << rank
<< "\n";
std::cout << e.what() << "\n";
#if ADIOS2_USE_MPI
std::cerr << "STOPPING PROGRAM from rank " << rank << "\n";
MPI_Abort(MPI_COMM_WORLD, 1);
#endif
}
catch (std::exception &e)
{
std::cout << "Exception, STOPPING PROGRAM from rank " << rank << "\n";
std::cout << e.what() << "\n";
#if ADIOS2_USE_MPI
std::cerr << "STOPPING PROGRAM from rank " << rank << "\n";
MPI_Abort(MPI_COMM_WORLD, 1);
#endif
}
#if ADIOS2_USE_MPI
MPI_Finalize();
#endif
return 0;
}
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