PT4Work/MPI6File12.cpp at main · labpak/PT4Work · GitHub

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#include "pt4.h"
#include "mpi.h"
void Solve()
{
    Task("MPI6File12");
    int flag;
    MPI_Initialized(&flag);
    if (flag == 0)
        return;
    int rank, size;
    MPI_Comm_size(MPI_COMM_WORLD, &size);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);

    char name[12];
    if (rank == 0)
        pt >> name;
    MPI_Bcast(name, 12, MPI_CHAR, 0, MPI_COMM_WORLD);

    MPI_Comm comm;
    int color = 0;

    int x = 0;
    pt >> x;

    if (x != 0)
        color = 1;

    if (color == 0)
        MPI_Comm_split(MPI_COMM_WORLD, MPI_UNDEFINED, rank, &comm);
    else
        MPI_Comm_split(MPI_COMM_WORLD, color, rank, &comm);

    if (comm == MPI_COMM_NULL)
        return;

    MPI_File f;
    MPI_File_open(comm, name, MPI_MODE_WRONLY, MPI_INFO_NULL, &f);

    MPI_Offset offs = (x - 1) * sizeof(double);
    MPI_Status s;

    int rk = 0;
    MPI_Comm_rank(comm, &rk);
    double rk2 = rk * 1.0;

    MPI_File_write_at_all(f, offs, &rk2, 1, MPI_DOUBLE, MPI_STATUSES_IGNORE);

    MPI_File_close(&f);
}