Thanks for the tips, Steve. I'll do my best to respond, but I may need 
your help to investigate some of these completely.

Torque is allocating multiple nodes for the job (as verified by the 
qstat -n command).

We purchased the cluster from a turnkey cluster provider, and have been 
able to distribute MPI jobs running a plain "mpirun" command and having 
it automatically distribute across the assigned nodes. I assume that 
means that the Torque+MPI integration is correctly wired up?

I am not using mpirun to execute the R script. I am either

  * (interactive) loading the job interactively, opening R, loading
    Rmpi, then running the commands
  * (batch) submitting a script which uses the Rscript interpreter to Torque

Should I be using the mpirun command? Is there a command I can run to 
test that out?

Thanks,
Jeff

On 1/22/2012 1:41 PM, Stephen Weston wrote:
> Have you verified that Torque is allocating multiple nodes for your job?
> If so, are you using some sort of mpirun command to execute your
> R script?  Are you using one of the mpirun --hostfile or --machinefile
> options to tell mpirun what nodes to execute on, or are you depending
> on MPI/Torque integration to get the allocated hosts?  Open MPI must
> be configured with the --with-tm option for Torque integration, for example.
>
> - Steve
>
>
> On Fri, Jan 20, 2012 at 4:53 PM, Jeff Allen<lists@jdadesign.net>  wrote:
>> I have been able to successfully setup snow (0.3-5) and Rmpi (0.5-9) on my
>> RedHat 5 cluster, and have it working perfectly for jobs that don't span
>> multiple nodes.
>>
>> We're using Torque for resource management, so I start a job with access to
>> multiple nodes and load Snow. Unfortunately, not matter what size cluster I
>> try to make, all of the workers end up running on the same host -- leaving
>> the other hosts idle.
>>
>> I'm no expert with MPI or snow, so I'm really not sure how to approach
>> debugging this.
>>
>> Any input would be much appreciated!
>>
>> Jeff
>>
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>> R-sig-hpc@r-project.org
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