view.c

来自「The example for Boor USING MPI2」· C语言 代码 · 共 32 行

#include "mpi.h"
int main( int argc, char *argv[] )
{
    MPI_Aint     lb, extent;
    MPI_Datatype etype, filetype, contig;
    MPI_Offset   disp;
    MPI_File     fh;
    int buf[1000];

    MPI_Init( &argc, &argv );
    /* ... other application code ... */
    MPI_File_open(MPI_COMM_WORLD, "/pfs/datafile", 
		  MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh);

    MPI_Type_contiguous(2, MPI_INT, &contig);
    lb     = 0;
    extent = 6 * sizeof(int);
    MPI_Type_create_resized(contig, lb, extent, &filetype);
    MPI_Type_commit(&filetype);

    disp  = 5 * sizeof(int);    /* assume displacement in this file view 
				   is of size equal to 5 integers */ 
    etype = MPI_INT;
    
    MPI_File_set_view(fh, disp, etype, filetype, "native", 
		      MPI_INFO_NULL);
    MPI_File_write(fh, buf, 1000, MPI_INT, MPI_STATUS_IGNORE);
    /* ... */
    MPI_Finalize();
    return 0;
}