[mpich-discuss] Only Run as root

[Tanner L. Nelson]

Good morning,



We have a small cluster in an isolated environment. Our lead has spearheaded a reinstall to get away from Bright Cluster Manager and CentOS. This is the first time our project has done anything like this, and we have hit a snag that we believe is MPI-related.



As root:

*       Job runs as expected (verified with 2 nodes)
*       mpirun with host file, same result



As user account:

*       Single node works
*       2 nodes, job hangs with no error output that we can find



To us, and our colleagues at our main Computing Center, it seems related to permissions/authentication. But everything we know to check has been checked several times (i.e. user can ssh to nodes 001-002 where root was successful, user was not; permissions on mpi directory 755, even tried 777 just to rule it out).



Details I believe may be asked:

*       RHEL9
*       Mpich4.2.3 was compiled with gcc11.5.0
*       Consistent results with scheduler and mpirun
*       Tested HPL and our primary application, both built against the same mpich version



Hoping we can get some suggestions. Thanks in advance!





Respectfully,

Tanner Nelson



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