[slurm-users] problems with slurm and openmpi

[Riccardo Veraldi]

Hello,
after trynig hard for over 10 days I am forced to write to the list.
I am not able to have SLURM work with openmpi. Openmpi compiled binaries
won't run on slurm, while all non openmpi progs run just fine under "srun".
I am using SLURM 18.08.5 building the rpm from the tarball: rpmbuild -ta
slurm-18.08.5-2.tar.bz2
prior to bulid SLURM I installed openmpi 4.0.0 which has built in pmix
support. the pmix libraries are in /usr/lib64/pmix/ which is the default
installation path.

The problem is that hellompi is not working if I launch in from srun. of
course it runs outside slurm.

[psanagpu105:10995] OPAL ERROR: Not initialized in file pmix3x_client.c at
line 113
--------------------------------------------------------------------------
The application appears to have been direct launched using "srun",
but OMPI was not built with SLURM's PMI support and therefore cannot
execute. There are several options for building PMI support under
SLURM, depending upon the SLURM version you are using:

  version 16.05 or later: you can use SLURM's PMIx support. This
  requires that you configure and build SLURM --with-pmix.

  Versions earlier than 16.05: you must use either SLURM's PMI-1 or
  PMI-2 support. SLURM builds PMI-1 by default, or you can manually
  install PMI-2. You must then build Open MPI using --with-pmi pointing
  to the SLURM PMI library location.

Please configure as appropriate and try again.
--------------------------------------------------------------------------
*** An error occurred in MPI_Init
*** on a NULL communicator
*** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
***    and potentially your MPI job)
[psanagpu105:10995] Local abort before MPI_INIT completed completed
successfully, but am not able to aggregate error messages, and not able to
guarantee that all other processes were killed!
srun: error: psanagpu105: task 0: Exited with exit code 1

I really have no clue. I even reinstalled openmpi on a specific different
path /opt/openmpi/4.0.0
anyway seems like slurm does not know how to fine the MPI libraries even
though they are there and right now in the default path /usr/lib64

even using --mpi=pmi2 or --mpi=openmpi does not fix the problem and the
same error message is given to me.
srun --mpi=list
srun: MPI types are...
srun: none
srun: openmpi
srun: pmi2


Any hint how could I fix this problem ?
thanks a lot

Rick
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