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

[Roberto Fichera]

On 03/03/2011 03:38 PM, Pavan Balaji wrote:
> 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.

Nice to know!

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

This is really nice!!! It might solve my problem once I'll implement dynamic resource allocation.
How can I provide my own node's list to hydra?

>
>  -- Pavan
>