ft_example_array.cpp

This example show how to use Array in FasTensor to access data.

Author

Bin Dong (dbin@.nosp@m.lbl..nosp@m.gov)

Version

0.1

Date

2021-05-28

Copyright

Copyright (c) 2021

/*
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FasTensor (FT) Copyright (c) 2021, The Regents of the University of
California, through Lawrence Berkeley National Laboratory (subject to
receipt of any required approvals from the U.S. Dept. of Energy). 
All rights reserved.
 
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please contact Berkeley Lab's Intellectual Property Office at
[email protected].
 
NOTICE.  This Software was developed under funding from the U.S. Department
of Energy and the U.S. Government consequently retains certain rights.  As
such, the U.S. Government has been granted for itself and others acting on
its behalf a paid-up, nonexclusive, irrevocable, worldwide license in the
Software to reproduce, distribute copies to the public, prepare derivative 
works, and perform publicly and display publicly, and to permit others to do so.
 
 
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*** License Agreement ***
 
FasTensor (FT) Copyright (c) 2021, The Regents of the University of
California, through Lawrence Berkeley National Laboratory (subject to
receipt of any required approvals from the U.S. Dept. of Energy). 
All rights reserved.
 
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You are under no obligation whatsoever to provide any bug fixes, patches,
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*/
 
#include <iostream>
#include <stdarg.h>
#include <vector>
#include <stdlib.h>
#include "ft.h"
 
using namespace std;
using namespace FT;
 
int main(int argc, char *argv[])
{
    //Init the MPICH, etc.
    AU_Init(argc, argv);
 
    //Input data
    Array<float> *A = new Array<float>("EP_HDF5:./test-data/testf-16x16-array.h5:/testg/testd");
 
    std::cout << "Read diagonal cells, via (...) operator: \n";
    for (int i = 0; i < 16; i++)
    {
        std::cout << A->operator()(i, i) << " , ";
    }
    std::cout << " \n\n";
 
    std::cout << "Read diagonal cells, via GetValue() method: \n";
    //Get the data by point, same as above operation
    for (int i = 0; i < 16; i++)
    {
        std::cout << A->GetValue(i, i) << " , ";
    }
    std::cout << " \n\n";
 
    for (int i = 0; i < 16; i++)
    {
        A->SetValue(0.001, i, i);
    }
    std::cout << "Read diagonal cells, after SetValue(0.001, ...) method: \n";
 
    for (int i = 0; i < 16; i++)
    {
        std::cout << A->GetValue(i, i) << " , ";
    }
    std::cout << " \n\n";
 
    std::vector<unsigned long long> start = {0, 0};
    std::vector<unsigned long long> end = {5, 5};
    std::vector<float> datav(6 * 6);
    A->ReadEndpoint(start, end, static_cast<void *>(datav.data()));
 
    std::cout << "Read vector of cells [0,0]-[5,5], via ReadEndpoint() method: \n";
    for (int i = 0; i < 6; i++)
    {
        for (int j = 0; j < 6; j++)
        {
            std::cout << datav[i * 6 + j] << ", ";
        }
        std::cout << " \n";
    }
    std::cout << " \n";
 
    //Let's update the data and write & read-back
    for (int i = 0; i < 6 * 6; i++)
    {
        datav[i] = datav[i] - 1.1;
    }
    A->WriteEndpoint(start, end, static_cast<void *>(datav.data()));
 
    std::vector<float> datav_updated(6 * 6);
    A->ReadEndpoint(start, end, static_cast<void *>(datav_updated.data()));
    std::cout << "Read vector of cells [0,0]-[5,5], after WriteEndpoint() /w each cell - 1.1: \n";
    for (int i = 0; i < 6; i++)
    {
        for (int j = 0; j < 6; j++)
        {
            std::cout << datav_updated[i * 6 + j] << ", ";
        }
        std::cout << " \n";
    }
    std::cout << " \n\n";
 
    delete A;
 
    AU_Finalize();
 
    return 0;
}