Newer
Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
/*
* Distributed under the OSI-approved Apache License, Version 2.0. See
* accompanying file Copyright.txt for details.
*
* helloBPReader.cpp: Simple self-descriptive example of how to read a variable
* to a BP File.
*
* Created on: Feb 16, 2017
* Author: William F Godoy godoywf@ornl.gov
*/
#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 */
const std::size_t Nx = 10;
std::vector<float> myFloats(Nx);
std::vector<int> myInts(Nx);
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("ReadBP");
/** Engine derived class, spawned to start IO operations */
auto bpReader = bpIO.Open("myVector.bp", adios2::Mode::Read);
if (!bpReader)
{
throw std::ios_base::failure(
"ERROR: bpWriter not created at Open\n");
}
/** Write variable for buffering */
adios2::Variable<float> *bpFloats =
bpReader->InquireVariable<float>("bpFloats");
adios2::Variable<int> *bpInts =
bpReader->InquireVariable<int>("bpInts");
/** Set selection */
adios2::Box
if (bpFloats != nullptr)
{
bpReader->Read<float>(*bpFloats, myFloats.data());
}
if (bpFloats != nullptr)
{
bpReader->Read<int>(*bpInts, myInts.data());
}
/** Create bp file, engine becomes unreachable after this*/
bpReader->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;
}