[MPICH] How to create a Window for 2D array

[Tao He]

Dear All,

I am a newer for One Sided-Communcation. I have a question how to create a window for 2D array. For example, I create a 2D double array by this function:

double** NewMPI2_2DPointer(int n1D, int n2D)
{ double **pp;
  int error;
  error = MPI_Alloc_mem(n1D * sizeof(double*), MPI_INFO_NULL, &pp);
  if (error != MPI_SUCCESS)
  {
    printf("Memory allocation failed for PP 1D array, aborting.\n");
    MPI_Abort(MPI_COMM_WORLD, -1);
    exit(-1);
  }

  for(i=0; i<n1D; i++)
  {
    error = MPI_Alloc_mem(n2D * sizeof(double), MPI_INFO_NULL, &pp[i]);
    if (error != MPI_SUCCESS)
    {
        printf("Memory allocation failed for PP 1D array, aborting.\n");
        MPI_Abort(MPI_COMM_WORLD, -1);
       exit(-1);
    }
  }

}

I want to create a window for this memory:
Like:
     error = MPI_Win_create(pp, n1D, sizeof(double*), MPI_INFO_NULL, MPI_COMM_WORLD, &win);

or should be
    error = MPI_Win_create(pp, n1D*n2D, sizeof(double), MPI_INFO_NULL, MPI_COMM_WORLD, &win);
                                        
Which is the right? Please tell me! THanks very much!

Tao
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