[mpich-discuss] Communicator conundrum

[Thakur, Rajeev]

One way to do it is described here: https://trac.mpich.org/projects/mpich/ticket/495

Rajeev

> On Aug 22, 2017, at 4:36 PM, Michael L. Stokes <Michael.Stokes at uah.edu> wrote:
> 
> I do apologize if this is going to the wrong group so please recommend another group if inappropriate. I do see it as a possible implementation issue.
> 
> I have a main program that spawns an MPI process A, and a second spawn from main that spawns MPI process B.  What I need is to create a communicator between processes A and B.  I don't see a way to do this with the current implementation.
> 
> I do see a way to do this if the local_comm and the peer_comm arguments in the MPI_Intercomm_create() function called in A and B could be the parent_comm in both processes.  Since you can't use the same argument for local_comm and peer_comm in the current implementation, I don't see a path forward.
> 
> Am I missing something here?  Is there another way to create a comm between A and B?
> 
> Thanks
> Mike
> 
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