Hi,
I think I have a bug on the Scientific Linux desktop relating to the
OpenMPI installation. It appears there is a condition which
prevents any MPI application from completing.
Bellow you can see perhaps the simplest MPI that can be written and still link to the MPI library:
x.F90
program main
use mpi
implicit none
integer :: ierror
call mpi_init(ierror)
call mpi_finalize(ierror)
end program main
I've compiled it with mpif90 -o x x.F90. Compilation goes fine, but when trying
to execute the resulting ‘x’ file, I received the following error:
libibverbs: Fatal: couldn't read uverbs ABI version.
--------------------------------------------------------------------------
[0,0,0]: OpenIB on host localhost was unable to find any HCAs.
Another transport will be used instead, although this may result in
lower performance.
--------------------------------------------------------------------------
librdmacm: couldn't read ABI version.
librdmacm: assuming: 4
libibverbs: Fatal: couldn't read uverbs ABI version.
CMA: unable to open /dev/infiniband/rdma_cm
The warnings should not be a problem as it just compalinging about not finding
a high performance interconnect network options that were compiled in and the
system will fall back to lower performance defaults.
strace gives a lot of output but shows the program is stalling with:
futex(0x26049c, FUTEX_WAIT, 2, NULL
It looks like some kind of deadlock is occurring probably relating to
the threads involved or shared memory.
I have compiled up a personal version of OpenMPI removing the OpenIB support:
./configure –prefix=/opt/local/openmpi --without-openib
This works (once I worked out that it was linking against the old
libraries at runtime) and the correct output (nothing) is produced.
Regards,
Panos
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