[mpich-discuss] MPI_Comm_spawn info argument

Wesley Bland wbland at mcs.anl.gov
Fri Aug 2 17:27:44 CDT 2013

To answer your second question since Pavan covered #1, once the parent application spawns the child process(es), it gets back a new communicator called an intercommunicator. You can do communication on that communicator similarly to a normal communicator including an MPI_BARRIER. So when your child is done, you can call a barrier on both ends and be sure that you're done. 


On Friday, August 2, 2013 at 4:03 PM, Matthieu Dorier wrote:

> Hi,
> Using MPI_Comm_spawn I'd like to know how to specify the list of hosts on which to spawn the new processes. The standard http://www.mpi-forum.org/docs/mpi-3.0/mpi30-report.pdf) says that the info field have some reserved keys, but nothing to actually give the list of hostnames. The closest key is "host" but it seems to designate a single host, not a set, and not even the number of process per host.
> What would be the keys for that in mpich and would they be understood my other implementation (e.g. OpenMPI)?
> Also another question related to MPI_Comm_spawn: how can a parent application be aware that the application it spawned terminated?
> And what happens when the parent application exits before the spawned one?
> Thanks,
> Matthieu Dorier
> PhD student at ENS Cachan Brittany and IRISA
> http://people.irisa.fr/Matthieu.Dorier
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