ft_example_reduce.cpp

This example show how to use merge data across ranks in FasTensor .

Author

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

Version

0.1

Date

2021-05-28

Copyright

Copyright (c) 2021

/*
****************************
 
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.
 
If you have questions about your rights to use or distribute this software,
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;
 
std::vector<unsigned long long> H_size = {4};
Array<float> *H;
 
//UDF One: duplicate the original data
inline Stencil<float> udf_hist(const Stencil<float> &iStencil)
{
    if (iStencil(0) < 40)
    {
        H->SetValue(H->GetValue(0) + 1, 0);
    }
    else if (iStencil(0) >= 40 && iStencil(0) < 80)
    {
        H->SetValue(H->GetValue(1) + 1, 1);
    }
    else if (iStencil(0) >= 80 && iStencil(0) < 120)
    {
        H->SetValue(H->GetValue(2) + 1, 2);
    }
    else if (iStencil(0) >= 120)
    {
        H->SetValue(H->GetValue(3) + 1, 3);
    }
 
    return 0;
}
 
int main(int argc, char *argv[])
{
    //Init the MPICH, etc.
    AU_Init(argc, argv);
 
    // set up the chunk size and the overlap size
    std::vector<int> chunk_size = {32};
    std::vector<int> overlap_size = {0};
 
    H = new Array<float>("EP_MEMORY", H_size);
    //Input data
    Array<float> *A = new Array<float>("EP_HDF5:./test-data/testf-16-reduce.h5:/testg/testd", chunk_size, overlap_size);
 
    //Initialize H
    for (int i = 0; i < 4; i++)
    {
        H->SetValue(0, i);
    }
 
    std::cout << "Enable Local Mirros: " << std::endl;
    //Result data
    H->Clone(0);
 
    //Run
    A->Apply(udf_hist);
 
    H->Merge(AU_SUM);
 
    H->Nonvolatile("EP_HDF5:./test-data/testf-16-reduce-hist.h5:/testg/testd");
 
    //Clear
    delete A;
    delete H;
 
    AU_Finalize();
 
    return 0;
}