Error message: fluent_mpi.6.3.26: Rank 0:0: MPI_Init: ibv_create_qp() failed
fluent_mpi.6.3.26: Rank 0:0: MPI_Init: Can't initialize RDMA device

On some operating systems the default amount of physical memory that can be pinned/locked by a user application is set to a low value and must be explicitly increased. A value recommended by Intel is 90% of the physical memory. Therefore, for a system with 8 GB of memory the following should be added to the /etc/security/limits.conf file on all machines in the cluster:

soft memlock 7500000
hard memlock 7500000

The computer must be re-booted after making this change

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