[mpich-discuss] machinefile error

[Dave Goodell]

Try sshing to each node once before trying your mpiexec again.  That or find some other way to put the host key fingerprints for your cluster nodes in to the known_hosts file.

Hydra docs are here: http://wiki.mcs.anl.gov/mpich2/index.php/Using_the_Hydra_Process_Manager

-Dave

On Jul 21, 2010, at 2:24 PM CDT, SULLIVAN David (AREVA) wrote:

> Ok. Attempting to use Hydra yields the following error:
> 
> [mcnp5_1-4 at node1 ~]$ mpiexec.hydra -f nodes -n 12 mcnp5.mpi i=aw04
> o=mpi.te
> The authenticity of host 'node1 (155.55.55.5)' can't be established.
> RSA key fingerprint is 28:bd:96:b9:2c:3f:05:cc:ca:67:f6:35:70:77:17:06.
> Are you sure you want to continue connecting (yes/no)? [proxy at node2]
> HYDU_sock_connect (./utils/sock/sock.c:141): [proxy at node3] connect error
> (No route to host)
> [proxy at node2] main (./pm/pmiserv/pmi_proxy.c:108): unable to connect to
> the main server
> HYDU_sock_connect (./utils/sock/sock.c:141): connect error (No route to
> host)
> [proxy at node3] main (./pm/pmiserv/pmi_proxy.c:108): unable to connect to
> the main server
> 
> Host key verification failed.
> [mcnp5_1-4 at node1 ~]$
> 
> There is very little in the user's guide on Hydra, so I am at your mercy
> for any information.
> 
> Thanks for the help-
> 
> Dave
> 
> -----Original Message-----
> From: mpich-discuss-bounces at mcs.anl.gov
> [mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Pavan Balaji
> Sent: Wednesday, July 21, 2010 1:23 PM
> To: mpich-discuss at mcs.anl.gov
> Subject: Re: [mpich-discuss] machinefile error
> 
> 
> On 07/20/2010 10:56 AM, SULLIVAN David (AREVA) wrote:
>> If I explicitly call mpiexec.hydra I get all sorts of problems, but I 
>> think it has to do with how the nodes are set up. On advice from 
>> debianclusters.org I entered the command mpd --daemon --ncpus=4. Next 
>> to see where this is running I enter mpdtrace -l. The response is
>> node1_12345 (127.0.0.1). That ip address doesn't look like it will
> work.
> 
> What problems are you having with Hydra? There are usage instructions on
> MPD in the MPICH2 user's guide (on our website), but I suggest you try
> Hydra first.
> 
>  -- Pavan
> 
> --
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
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