[mpich-discuss] MPI_Comm_spawn(), dynamic distribution and hydra

[Pavan Balaji]

Roberto,

On 03/03/2011 02:47 AM, Roberto Fichera wrote:
>> Hydra doesn't currently have the capability to request for more
>> resources from a resource manager. It can only query for the
>> allocated resources.
>
> So it means that at this time I have to use directly the resource
> manager API, right?
>
> What about to perform the MPI boot process on freshly allocated
> nodes? Do you have any suggestion how to make it?

The host list Hydra manages is static currently. It queries this from 
the resource manager at launch time. However, if you specify the host 
name to launch on using the info argument to comm_spawn, it will bypass 
the node list Hydra detected and use these nodes.

Note that Hydra does not have a boot-up process. It's automatically done 
internally for you.

  -- Pavan

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji