Is this a debug build of OMPI? In other words, was it configured with 
—enable-debug? If so, you can get some further output to see what is causing 
the problem by adding the following to your cmd line:

—leave-session-attached —mca plm_base_verbose 5  —mca state_base_verbose 5

BTW: what version of OMPI are you using?


> On Sep 27, 2015, at 8:47 AM, Filippo Spiga <spiga.fili...@gmail.com> wrote:
> 
> Hello,
> 
> I am trying to run OpenMPI on a cluster where I am only allow to use RSH to 
> spawn processes across compute nodes. I modified my mpirun command in this 
> way:
> 
> mpirun -np 48 --hostfile ./hostfile --mca plm_rsh_agent "rsh" 
> /central_storage/osu_barrier
> 
> the file "hostfile" contain the machine where I am running mpirun plus 
> another node. Libraries and osu_barrier are located in a central storage 
> mounted by all nodes. The processes osu_barrier are spawn correctly across 
> two nodes but no output is returned and the command seems stuck. Any idea 
> what can I look at to try to solve this issue?
> 
> Thanks
> 
> --
> Mr. Filippo SPIGA, M.Sc.
> http://fspiga.github.io ~ skype: filippo.spiga
> 
> «Nobody will drive us out of Cantor's paradise.» ~ David Hilbert
> 
> *****
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