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/*
* Distributed under the OSI-approved Apache License, Version 2.0. See
* accompanying file Copyright.txt for details.
*
* inlineReaderWriter.cpp example borrowed from bpTimeWriter, using
* the inline engine. Writes 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: Nov 16, 2018
* Author: Aron Helser aron.helser@kitware.com
*/
#include <algorithm> //std::for_each
#include <ios> //std::ios_base::failure
#include <iostream> //std::cout
#include <stdexcept> //std::invalid_argument std::exception
#include <vector>
#include <adios2.h>
void DoAnalysis(adios2::IO &inlineIO, adios2::Engine &inlineReader, int rank, unsigned int step)
{
inlineReader.BeginStep();
/////////////////////READ
adios2::Variable<float> inlineFloats000 = inlineIO.InquireVariable<float>("inlineFloats000");
adios2::Variable<std::string> inlineString =
inlineIO.InquireVariable<std::string>("inlineString");
if (inlineFloats000)
{
auto blocksInfo = inlineReader.BlocksInfo(inlineFloats000, step);
std::cout << "Data StepsStart " << inlineFloats000.StepsStart() << " from rank " << rank
<< ": ";
for (auto &info : blocksInfo)
{
// bp file reader would see all blocks, inline only sees local
// writer's block(s).
size_t myBlock = info.BlockID;
inlineFloats000.SetBlockSelection(myBlock);
// info passed by reference
// engine must remember data pointer (or info) to fill it out at
// PerformGets()
inlineReader.Get<float>(inlineFloats000, info, adios2::Mode::Deferred);
}
inlineReader.PerformGets();
for (const auto &info : blocksInfo)
{
adios2::Dims count = info.Count;
const float *vectData = info.Data();
for (size_t i = 0; i < count[0]; ++i)
{
float datum = vectData[i];
std::cout << datum << " ";
}
std::cout << "\n";
}
}
else
{
std::cout << "Variable inlineFloats000 not found\n";
}
if (inlineString && rank == 0)
{
std::string myString;
inlineReader.Get(inlineString, myString, adios2::Mode::Sync);
std::cout << "inlineString: " << myString << "\n";
}
inlineReader.EndStep();
// all deferred block info are now valid - need data pointers to be
// valid, filled with data
}
int main(int argc, char *argv[])
{
int rank = 0, size = 1;
#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);
adios2::ADIOS adios(MPI_COMM_WORLD);
#else
adios2::ADIOS adios;
#endif
// Application variable
std::vector<float> myFloats = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
const std::size_t Nx = myFloats.size();
try
{
// Inline uses single IO for write/read
adios2::IO inlineIO = adios.DeclareIO("InlineReadWrite");
/// WRITE
inlineIO.SetEngine("Inline");
inlineIO.SetParameter("verbose", "4");
/** global array: name, { shape (total dimensions) }, { start
* (local) },
* { count (local) }, all are constant dimensions */
const unsigned int variablesSize = 10;
std::vector<adios2::Variable<float>> inlineFloats(variablesSize);
adios2::Variable<std::string> inlineString =
inlineIO.DefineVariable<std::string>("inlineString");
for (unsigned int v = 0; v < variablesSize; ++v)
{
std::string namev("inlineFloats");
if (v < 10)
{
namev += "00";
}
else if (v < 100)
{
namev += "0";
}
namev += std::to_string(v);
inlineFloats[v] = inlineIO.DefineVariable<float>(namev, {size * Nx}, {rank * Nx}, {Nx},
adios2::ConstantDims);
}
/** global single value variable: name */
adios2::Variable<unsigned int> inlineTimeStep =
inlineIO.DefineVariable<unsigned int>("timeStep");
adios2::Engine inlineWriter = inlineIO.Open("myWriteID", adios2::Mode::Write);
adios2::Engine inlineReader = inlineIO.Open("myReadID", adios2::Mode::Read);
for (unsigned int timeStep = 0; timeStep < 3; ++timeStep)
{
inlineWriter.BeginStep();
if (rank == 0) // global single value, only saved by rank 0
{
inlineWriter.Put<unsigned int>(inlineTimeStep, timeStep);
}
// template type is optional, but recommended
for (unsigned int v = 0; v < variablesSize; ++v)
{
// Note: Put is deferred, so all variables will see v == 9
// and myFloats[0] == 9, 10, or 11
myFloats[rank] = static_cast<float>(v + timeStep + rank);
inlineWriter.Put(inlineFloats[v], myFloats.data());
}
const std::string myString("Hello from rank: " + std::to_string(rank) +
" and timestep: " + std::to_string(timeStep));
if (rank == 0)
{
inlineWriter.Put(inlineString, myString);
}
inlineWriter.EndStep();
DoAnalysis(inlineIO, inlineReader, rank, timeStep);
}
}
catch (std::exception const &e)
{
std::cout << "Caught exception from rank " << rank << "\n";
std::cout << e.what() << "\n";
#if ADIOS2_USE_MPI
return MPI_Abort(MPI_COMM_WORLD, 1);
#else
return 1;
#endif
}
#if ADIOS2_USE_MPI
MPI_Finalize();
#endif
return 0;
}
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