Cardinal

STAR-CCM+ MPI job failure

STAR-CCM+ encounters errors when running MPI jobs using Intel MPI or Open MPI, displaying the following message:

ib_iface.c:1139 UCX ERROR Invalid active_speed on mlx5_0:1: 128

This issue occurs because the UCX library (v1.8) bundled with STAR-CCM+ only supports Mellanox InfiniBand EDR, whereas the Cardinal cluster utilizes newer Mellanox InfiniBand NDR (Next Data Rate) fabric. Because UCX v1.8 cannot recognize the NDR speed, STAR-CCM+ fails to communicate across the network.

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