Jeffrey, Thank you for pointing me in the right direction.
The problem was that the OpenMPI installation in "/home/manumachu/openmpi-4.0.3" was copied to "/scratch/manumachu/openmpi-4.0.3/OPENMPI_INSTALL." While 'which mpirun' and 'mpirun' work, It seems copying seems to break the slurm-mpirun interface. I did a fresh clean install in "/scratch/manumachu/openmpi-4.0.3/OPENMPI_INSTALL." Now it works. -- Kind Regards Ravi
