MPI_Send/Recv通信器数据类型错误 [英] MPI_Send/ Recv communicator datatype error

问题描述

我有以下用Fortran 90编写的基本MPI程序:

I have the following basic MPI program written in Fortran 90:

program sendRecv
include 'mpif.h'

!MPI Variables
integer ierr, numProcs, procID
!My variables
integer dat, datRec

!Init MPI
call MPI_INIT ( ierr )
!Get number of processes/ cores requested
call MPI_COMM_SIZE (MPI_COMM_WORLD, numProcs, ierr)
!Get rank of process
call MPI_COMM_RANK (MPI_COMM_WORLD, procID, ierr)

if (procID .eq. 0) then 
    dat=4

    !Send num to process 1
    call MPI_SEND (dat, 1, MPI_INT, 1, 0, MPI_COMM_WORLD, ierr)

else if (procID .eq. 1) then 
    !Recieve num from process 0
    call MPI_RECV (datRec, 1, MPI_INT, 0, MPI_ANY_SOURCE, MPI_COMM_WORLD, MPI_STATUS_SIZE, ierr)

    !Display info   
    write(*,*) "Process 1 recieved ", datRec, " from proc 0"

else 
    write(*,*)"Into else"
end if

!Finilise MPI
call MPI_FINALIZE ( ierr )

end program sendRecv

目的仅仅是从进程0发送一个整数，并在进程1中接收并显示它，但是无论我如何尝试，我都无法使它正常工作.

The purpose is just to send an integer from process 0 and receive and display it in process 1, but whatever i seem to try, i cannot get it to work.

我正在使用以下程序编译并运行该程序:

I am compiling and running this program with:

mpif90 sendRecv.f90 -o tst
mpirun -n 2 tst

正在得到这个:

[conor-Latitude-XT2:3053] *** An error occurred in MPI_Send
[conor-Latitude-XT2:3053] *** on communicator MPI_COMM_WORLD
[conor-Latitude-XT2:3053] *** MPI_ERR_TYPE: invalid datatype
[conor-Latitude-XT2:3053] *** MPI_ERRORS_ARE_FATAL (your MPI job will now abort)
--------------------------------------------------------------------------
mpirun has exited due to process rank 1 with PID 3054 on
node conor-Latitude-XT2 exiting without calling "finalize". This may
have caused other processes in the application to be
terminated by signals sent by mpirun (as reported here).
--------------------------------------------------------------------------
[conor-Latitude-XT2:03052] 1 more process has sent help message help-mpi-errors.txt / mpi_errors_are_fatal
[conor-Latitude-XT2:03052] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages

我环顾四周，但我无法发现我的错误. 任何帮助都会很棒，谢谢！

I have looked around but i just cant spot my error. Any help would be great, thanks!

推荐答案

MPI_INT对应于C和C ++的int类型. Fortran INTEGER类型由预定义的MPI数据类型MPI_INTEGER表示.

MPI_INT corresponds to the int type of C and C++. The Fortran INTEGER type is represented by the predefined MPI datatype MPI_INTEGER.

此外，您的代码中还有另一个错误.您传递MPI_STATUS_SIZE，而必须传递相同大小的整数数组，例如:

Besides there is another error in your code. You pass MPI_STATUS_SIZE whereas you have to pass an integer array of the same size, e.g.:

INTEGER status(MPI_STATUS_SIZE)

CALL MPI_SEND(..., status, ierr)

我还建议您替换

include 'mpif.h'

使用

use mpi

mpif.h是废弃的Fortran 77界面，不应在现代程序中使用. mpi模块接口本身也已被mpi_f08模块接口淘汰，但它来自MPI-3.0，仍未得到广泛实现.

mpif.h is an obsoleted Fortran 77 interface and it should not be used in modern programs. The mpi module interface itself is also obsoleted by the mpi_f08 module interface, but that comes from MPI-3.0 and is still not widely implemented.

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