Interesting.  Yes, I was saying that the latest trunk does not work for me.  I 
just retested the trunk also, and no luck.
Are you launching the MPI processes on remote nodes from the HNP?

>-----Original Message-----
>From: devel-boun...@open-mpi.org [mailto:devel-boun...@open-mpi.org]
>On Behalf Of Ralph Castain
>Sent: Thursday, January 31, 2013 11:40 AM
>To: Open MPI Developers
>Subject: Re: [OMPI devel] mpirun -host does not work from r27879 and
>forward on trunk
>
>FWIW: I just tried it on the trunk head and it worked fine
>
>On Jan 31, 2013, at 8:20 AM, Ralph Castain <r...@open-mpi.org> wrote:
>
>> Ummm...that was fixed a long time ago. You might try a later version.
>>
>> Or are you saying the head of the trunk doesn't work too?
>>
>> On Jan 31, 2013, at 7:31 AM, Rolf vandeVaart <rvandeva...@nvidia.com>
>wrote:
>>
>>> I have stumbled into a problem with the -host argument.  This problem
>appears to be introduced with changeset r27879 on 1/19/2013 by rhc.
>>>
>>> With r27877, things work:
>>> [rolf@node]$ which mpirun
>>> /home/rolf/ompi-trunk-r27877/64/bin/mpirun
>>> [rolf@node]$ mpirun -np 2 -host c0-0,c0-3 hostname
>>> c0-3
>>> c0-0
>>>
>>> With r27879, things are broken:
>>> [rolf@node]$ setenv PATH /home/rolf/ompi-trunk-r27879/64/bin:${PATH}
>>> [rolf@node]$ mpirun -np 2 -host c0-0,c0-3 hostname
>>> ---------------------------------------------------------------------
>>> ----- All nodes which are allocated for this job are already filled.
>>> ---------------------------------------------------------------------
>>> -----
>>> [rolf@Fermi-Cluster nv]$
>>>
>>> Note: Could not compile r27878 so did not test that.
>>>
>>> I can only run processes on the same node as mpirun.
>>>
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