Looks to me like your 65th host is missing the dstore library - is it possible 
you don't have your paths set correctly on all hosts in your hostfile?


On Aug 10, 2014, at 1:13 PM, Lenny Verkhovsky <len...@mellanox.com> wrote:

> Hi all,
>  
> Trying to run OpenMPI ( trunk Revision: 32428 ) I faced the problem running 
> OMPI with more than 65 procs.
> It looks like MPI failes to open 66th connection even with running `hostname` 
> over tcp.
> It also seems to unrelated to specific host.
> All hosts are Ubuntu 12.04.1 LTS
> mpirun -np 66 --hostfile /proj/SSA/Mellanox/tmp//20140810_070156_hostfile.txt 
> --mca btl tcp,self hostname
> [nodename] [[4452,0],65] ORTE_ERROR_LOG: Error in file 
> base/ess_base_std_orted.c at line 288
> 
> …………………………………
> 
> It looks like environment issue, but I can’t find any limit related.
> Any ideas ?
> Thanks.
> Lenny Verkhovsky
> SW Engineer,  Mellanox Technologies
> www.mellanox.com
>  
> Office:    +972 74 712 9244
> Mobile:  +972 54 554 0233
> Fax:        +972 72 257 9400
>  
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