Re: OpenMPI Fortran: 'Error reading module mpi' and unexpected but silent termination

On 2007-10-30, Koen Poppe <MyFirstName.MyLastName@xxxxxxxxxxxxxxxxxxx> wrote:


Hello,

I'm encountering very strange behaviour with the very basic MPI/Fortran
program listed at the end of the message on a system running KUbuntu and
with the following compilers:
- gcc (GCC) 4.1.2 (Ubuntu 4.1.2-0ubuntu4)
- GNU-Fortran compiler, 4.3.0 20071002 (experimental)
- OpenMPI 1.1-2.3

Koen,

As I am guiding you with your master's thesis, let me add some additional
comments to your post.

First of all: apparently something went wrong while you were copy-pasting
your program... I've cleaned up the formatting a bit. Here it is:

---> cut here <---------------------------

program test_mpi

implicit none

!use mpi
include 'mpif.h'

integer :: rank, nb, ierr


print *,"right before mpi_init"
call mpi_init( ierr )

print *, "right before mpi_comm_rank"
call mpi_comm_rank(MPI_COMM_WORLD, rank, ierr)
print *,"Hello, I'm processor ", rank

print *,"right before mpi_finalize"
call mpi_finalize(ierr)

end program test_mpi

-------> end cut <-----------------------


So now what exactly is our problem...

If we try to compile this using

bartv@kortrijk:~/mpi_test$ mpif90 test_mpi.f90

Then we get the errors:

/tmp/cc0CK30o.o: In function `MAIN__':
test_mpi.f90:(.text+0x88): undefined reference to `mpi_init_'
test_mpi.f90:(.text+0x105): undefined reference to `mpi_comm_rank_'
test_mpi.f90:(.text+0x1f6): undefined reference to `mpi_finalize_'
collect2: ld returned 1 exit status

Apparently, as we have found, these undefined references can be solved
by adding the -fsecond-underscore option to the mpif90 wrapper command:

bartv@kortrijk:~/mpi_test$ mpif90 test_mpi.f90 -fsecond-underscore
bartv@kortrijk:~/mpi_test$

Which seems to compile fine. However, you are right. When we try to
run the program using the command

bartv@kortrijk:~/mpi_test$ mpirun -np 4 a.out

we only get the output:

right before mpi_init
right before mpi_init
right before mpi_init
right before mpi_init

so it seems like the program stops at the mpi_init subroutine and never
gets passed that.

We are hoping that somebody in this group can give us some advice on why
the program seems to stop at the mpi_init command. All help welcome.

Thanks,
Bart

PS: for the record: we are trying this on a Kubuntu system using

bartv@kortrijk:~/mpi_test$ mpif90 --version | head -1
GNU Fortran (GCC) 4.3.0 20071002 (experimental) [trunk revision 128946]

and OpenMPI as our MPI-library:

bartv@kortrijk:~/mpi_test$ dpkg --list | grep openmpi
ii openmpi-bin 1.1-2.3 high performance message passing library
ii openmpi-common 1.1-2.3 high performance message passing library
ii openmpi-dev 1.1-2.3 high performance message passing library
ii openmpi-libs0 1.1-2.3 high performance message passing library
.

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