Hi,
Thanks for the response. In this case, the entire set of nodes that are
in the LAM universe will not be assigned any other jobs by the scheduler
(even if they are actually not running any MPI jobs), correct? I want
the scheduler-MPI interaction to be more dynamic than that. This way I
could ask for more nodes in between iterations (or several iterations)
and if the scheduler has gotten some nodes from other completed jobs
(and there are no other queued jobs (based on priorities and other
scheduling policies), it could assign them to me and I could run the MPI
job in more nodes than I started with. After after some iterations, I
could give back some nodes when the MPI job I am running does not need
so many.
Can anyone explain to me what can let me do this? If this is currently
not possible, how much effort would it be for me to modify the LAM
sources to do this? That could be best determined by one of the
developers, I guess. The point that I am wondering about is that if this
cannot be supported, then what is the point in MPI-2 dynamic process
management in the context of a resource manager? Wondering ...!!!
Regards,
Prakash
>>> Josh Hursey <jjhursey_at_[hidden]> 05/12/05 5:34 PM >>>
The TM interface is used in lamboot to create the LAM universe. Once
the LAM universe has been created, then you can use the MPI-2 dynamic
process functionality just as if you were outside of the scheduler
environment. The limitation is that you have to work inside the LAM
universe that you created during lamboot when creating processes.
However, the TM interface doesn't support the addion/subtraction of
resources to the LAM universe (such as asking the scheduler for more
nodes).
Does that address your question?
Cheers,
Josh
On May 12, 2005, at 1:18 PM, Prakash Velayutham wrote:
> Prakash Velayutham wrote:
>
>> Hi,
>>
>> Is LAM/MPI's MPI-2 features like Dynamic Process Management
>> integrated with any Scheduler at all? I would like to work on this if
>> it does not already exist. Is there a developer's mailing list
>> seperately available?
>>
>> Regards,
>> Prakash
>
> Sorry to be posting again. I am interested to know whether the current
> TM interface of OpenPBS/PBSPro/Torque can handle dynamic process
> creation and management feature of MPI-2. If not, is there a plan to
> integrate this feature with some scheduler?
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
----
Josh Hursey
jjhursey_at_[hidden]
http://www.lam-mpi.org/
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