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Subject: Re: [OMPI users] Dynamic process tutorials?
From: Brian Budge (brian.budge_at_[hidden])
Date: 2010-07-12 11:07:53


Hi Jody -

Thanks for the reply. is there a way of "fusing" intercommunicators?
Let's say I have a higher level node scheduler, and it makes a new
node available to a COMM that is already running. So the master
spawns another process for that node. How can the new process
communicate with the other already started processes?

Also, how can you specify with MPI_Comm_spawn/multiple() how do you
specify IP addresses on which to start the processes?

If my higher level node scheduler needs to take away a process from my
COMM, is it good/bad for that node to call MPI_Finalize as it exits?

I would prefer not to use any of the MPI command-line utilities
(mpirun/mpiexec) if that's possible.

Thanks,
  Brian

On Sat, Jul 10, 2010 at 11:53 PM, jody <jody.xha_at_[hidden]> wrote:
> Hi Brian
> When you spawn processes with MPI_Comm_spawn(), one of the arguments
> will be set to an intercommunicator of thes spawner and the spawnees.
> You can use this intercommunicator as the communicator argument
> in the MPI_functions.
>
> Jody
> On Fri, Jul 9, 2010 at 5:56 PM, Brian Budge <brian.budge_at_[hidden]> wrote:
>> Hi all -
>>
>> I've been looking at the dynamic process features of mpi-2.  I have managed
>> to actually launch processes using spawn, but haven't seen examples for
>> actually communicating once these processes are launched.  I am additionally
>> interested in how processes created through multiple spawn calls can
>> communicate.
>>
>> Does anyone know of resources that describe these topics?  My google-fu must
>> not be up to par :)
>>
>> Thanks,
>>   Brian
>>
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