[mvapich-discuss] mpirun_rsh: Unable to get host entry

[Champagne, Nathan J. (JSC-EV)[Jacobs Technology]]

Thanks for the suggestions. We just changed from a Myrinet switch to a Mellanox switch. We think we need to create an interface for the new switch.

Thanks,
Nathan


On Jul 22, 2011, at 7:52 AM, "Jonathan Perkins" <perkinjo at cse.ohio-state.edu> wrote:

> Hi, it looks like there is some problem with resolution of the
> hostname.  Perhaps the compute node is unable to determine how to
> reach the launching node.  This may be due to one of the components
> believing that it can reach the other by using the loopback device.
> 
> Is your launching node the same as the node its running on.  If not,
> can each node resolve the hostname of each other (either dns or
> /etc/hosts)?  There may be an issue where the hostname of the machine
> is assigned to the loopback interface on one of the machines in
> /etc/hosts.  If this is the case you can edit the /etc/hosts file so
> that the hostname is placed on the line for the external ip address of
> the machine instead.
> 
> On Thu, Jul 21, 2011 at 10:59 PM, Champagne, Nathan J. (JSC-EV)[Jacobs
> Technology] <nathan.j.champagne at nasa.gov> wrote:
>> Hello,
>> I'm using MVAPICH 1.7rc1 on a Gentoo Linux cluster with a Mellanox
>> Infiniband switch. To test the installation, I am trying to run the cxxpi
>> example as follows:
>> 
>> $ mpirun_rsh -np 1 -hostfile ./hosts_test ./cxxpi
>> [unset]: Unable to get host entry for
>> [unset]: Unable to connect to  on 46570
>> Fatal error in MPI_Init:
>> Other MPI error
>> [juggernaut:mpispawn_0][child_handler] MPI process (rank: 0, pid: 22152)
>> exited with status 1
>> $
>> 
>> The file "hosts_test" contains the host IP addresses.
>> Does anyone have any ideas that come to mind for what's happening?
>> Thanks,
>> Nathan
>> 
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>> 
>> 
> 
> 
> 
> -- 
> Jonathan Perkins
> http://www.cse.ohio-state.edu/~perkinjo