[OMPI users] OpenMPI and names of the nodes in a cluster

[Patrick Begou via users]

Hi all,

we are facing a serious problem with OpenMPI (4.0.2) that we have 
deployed on a cluster. We do not manage this large cluster and the names 
of the nodes do not agree with Internet standards for protocols: they 
contain a "_" (underscore) character.

So OpenMPI complains about this and do not run.

I've tried to use IP instead of host names in the host file without any 
success.

Is there a known workaround for this as requesting the administrators to 
change the nodes names on this large cluster may be difficult.

Thanks

Patrick