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I want to create a file and write to it using msi4py. I was given this code from my instructor, in C++.

#include "stdafx.h"
#include <iostream>
using namespace std;

#include <mpi.h>

int main(int argc, char *argv[])

 const int size = 10;
 MPI_File fh;
 int rank;
 int buf[size];
 MPI_Status status;

 MPI_Init(&argc, &argv);
 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
 MPI_File_open(MPI_COMM_WORLD, "test.txt", MPI_MODE_CREATE 

I know this code is creating an array from 0-9 (size 10) and adding 65 to each element in the array. I found code from msi4py documentation that writes:

from mpi4py import MPI
import numpy as np

comm = MPI.COMM_WORLD
rank = comm.Get_rank()
size = comm.Get_size()

amode = MPI.MODE_WRONLY|MPI.MODE_CREATE
fh = MPI.File.Open(comm, "./datafile.txt", amode)

item_count = 10

buffer = np.empty(item_count, dtype='i')
buffer[:] = rank

filetype = MPI.INT.Create_vector(item_count, 1, size)
filetype.Commit()

displacement = MPI.INT.Get_size()*rank
fh.Set_view(displacement, filetype=filetype)

fh.Write_all(buffer)
filetype.Free()
fh.Close()

In the datafile.txt file, it just shows empty square '[]' brackets. How can I write an array to a file using this setup?

python python-3.x pycharm mpi mpi4py

share|improve this question

asked Mar 28 at 18:24

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622 bronze badges

add a comment
 | 

0

I want to create a file and write to it using msi4py. I was given this code from my instructor, in C++.

#include "stdafx.h"
#include <iostream>
using namespace std;

#include <mpi.h>

int main(int argc, char *argv[])

 const int size = 10;
 MPI_File fh;
 int rank;
 int buf[size];
 MPI_Status status;

 MPI_Init(&argc, &argv);
 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
 MPI_File_open(MPI_COMM_WORLD, "test.txt", MPI_MODE_CREATE 

I know this code is creating an array from 0-9 (size 10) and adding 65 to each element in the array. I found code from msi4py documentation that writes:

from mpi4py import MPI
import numpy as np

comm = MPI.COMM_WORLD
rank = comm.Get_rank()
size = comm.Get_size()

amode = MPI.MODE_WRONLY|MPI.MODE_CREATE
fh = MPI.File.Open(comm, "./datafile.txt", amode)

item_count = 10

buffer = np.empty(item_count, dtype='i')
buffer[:] = rank

filetype = MPI.INT.Create_vector(item_count, 1, size)
filetype.Commit()

displacement = MPI.INT.Get_size()*rank
fh.Set_view(displacement, filetype=filetype)

fh.Write_all(buffer)
filetype.Free()
fh.Close()

In the datafile.txt file, it just shows empty square '[]' brackets. How can I write an array to a file using this setup?

python python-3.x pycharm mpi mpi4py

share|improve this question

asked Mar 28 at 18:24

Kontrol EgoKontrol Ego

622 bronze badges

add a comment
 | 

I want to create a file and write to it using msi4py. I was given this code from my instructor, in C++.

#include "stdafx.h"
#include <iostream>
using namespace std;

#include <mpi.h>

int main(int argc, char *argv[])

 const int size = 10;
 MPI_File fh;
 int rank;
 int buf[size];
 MPI_Status status;

 MPI_Init(&argc, &argv);
 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
 MPI_File_open(MPI_COMM_WORLD, "test.txt", MPI_MODE_CREATE 

I know this code is creating an array from 0-9 (size 10) and adding 65 to each element in the array. I found code from msi4py documentation that writes:

from mpi4py import MPI
import numpy as np

comm = MPI.COMM_WORLD
rank = comm.Get_rank()
size = comm.Get_size()

amode = MPI.MODE_WRONLY|MPI.MODE_CREATE
fh = MPI.File.Open(comm, "./datafile.txt", amode)

item_count = 10

buffer = np.empty(item_count, dtype='i')
buffer[:] = rank

filetype = MPI.INT.Create_vector(item_count, 1, size)
filetype.Commit()

displacement = MPI.INT.Get_size()*rank
fh.Set_view(displacement, filetype=filetype)

fh.Write_all(buffer)
filetype.Free()
fh.Close()

In the datafile.txt file, it just shows empty square '[]' brackets. How can I write an array to a file using this setup?

python python-3.x pycharm mpi mpi4py

share|improve this question

asked Mar 28 at 18:24

Kontrol EgoKontrol Ego

622 bronze badges

#include "stdafx.h"
#include <iostream>
using namespace std;

#include <mpi.h>

int main(int argc, char *argv[])

 const int size = 10;
 MPI_File fh;
 int rank;
 int buf[size];
 MPI_Status status;

 MPI_Init(&argc, &argv);
 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
 MPI_File_open(MPI_COMM_WORLD, "test.txt", MPI_MODE_CREATE 

from mpi4py import MPI
import numpy as np

comm = MPI.COMM_WORLD
rank = comm.Get_rank()
size = comm.Get_size()

amode = MPI.MODE_WRONLY|MPI.MODE_CREATE
fh = MPI.File.Open(comm, "./datafile.txt", amode)

item_count = 10

buffer = np.empty(item_count, dtype='i')
buffer[:] = rank

filetype = MPI.INT.Create_vector(item_count, 1, size)
filetype.Commit()

displacement = MPI.INT.Get_size()*rank
fh.Set_view(displacement, filetype=filetype)

fh.Write_all(buffer)
filetype.Free()
fh.Close()

share|improve this question

asked Mar 28 at 18:24

Kontrol EgoKontrol Ego

622 bronze badges

share|improve this question

asked Mar 28 at 18:24

Kontrol EgoKontrol Ego

622 bronze badges

asked Mar 28 at 18:24

Kontrol EgoKontrol Ego

622 bronze badges

asked Mar 28 at 18:24

Kontrol EgoKontrol Ego

622 bronze badges