Upgrade to OMPI v4 or at least something in the v3 series. If you continue to 
have a problem, then set PMIX_MCA_ptl=tcp in your environment.

On Jul 26, 2019, at 12:12 PM, Kulshrestha, Vipul via users 
<users@lists.open-mpi.org <mailto:users@lists.open-mpi.org> > wrote:

 I am trying to setup my open-mpi application to run under grid.
 It works sometimes, but sometimes I get the below error. I have contacted my 
grid site administrator and the message from them is that they cannot change 
the TMPDIR path used in the grid configuration.
 I have tried setting TNPDIR, but it does not help (probably because grid 
engine resets it).
 What other alternatives do I have?
 One other curious question is that why does open-mpi creates such a large 
name? I understand that part of this path is dependent on TMPDIR value, but 
even after that it adds additional unnecessary characters like 
“openmpi-sessions-<5 digit number>@<machine name>_0/<another 5 digit number>”, 
which could have been shortened to something like “omp-<5 digit 
number>@<machine name>_0/<5 digit number>” and saving 14 characters (almost 15% 
of possible length).
 PMIx has detected a temporary directory name that results
in a path that is too long for the Unix domain socket:
     Temp dir: /var/spool/sge/wv2/tmp/<9 digit grid job id>.1.<16 character 
<mailto:.q/openmpi-sessions-43757@%3c12>  character machine name>_0/50671
 Try setting your TMPDIR environmental variable to point to
something shorter in length
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