mpi_file_set_view似乎不起作用

Question

我刚开始学习MPI I / O，所以我得到了一个简单的测试代码，如下所示

PROGRAM main

use mpi

integer :: ierr, myrank, thefile, numprocs, &
           etype, filetype

character(len = 20) :: data_rep

integer(kind=MPI_OFFSET_KIND) :: disp, disp_get

call MPI_INIT(ierr)
call MPI_COMM_RANK(MPI_COMM_WORLD, myrank, ierr)
call mpi_comm_size(mpi_comm_world, numprocs, ierr)

thefile = 1

call MPI_FILE_OPEN(MPI_COMM_WORLD, 'testfile', &
                   MPI_MODE_WRONLY+MPI_MODE_CREATE, &
                   MPI_INFO_NULL, thefile, ierr)

disp = myrank*2

call MPI_FILE_SET_VIEW(thefile, disp, MPI_INTEGER, &
                       MPI_INTEGER, 'internal', &
                       MPI_INFO_NULL, ierr)

call mpi_file_get_view(thefile, disp_get, etype, filetype, &
                       data_rep, ierr)

print *, myrank, disp_get, etype, filetype, data_rep

call MPI_FILE_CLOSE(thefile, ierr)

call MPI_FINALIZE(ierr)

END PROGRAM main

我使用-np = 4，所以我希望输出为：

       0                     0           1           1 internal              
       1                     2           1           1 internal            
       2                     4           1           1 internal            
       3                     6           1           1 internal

相反，我得到了

       0                     0           1           1 native              
       1                     0           1           1 native              
       2                     0           1           1 native              
       3                     0           1           1 native 

好像函数mpi_file_set_view根本不起作用。有什么建议吗？

我在Ubuntu上使用了OpenMPI 1.7和ifort 13。