On Aug 4, 2008, at 12:59 AM, Mark Borgerding wrote:
You should be able to merge each child communicator from each
accept thread into a global comm anyway.
Can you elaborate? I am struggling to see how to implement this. A
pointer to sample code would be helpful.
Specifically, I'd like to be able to have a single process merge/
join/aggregate a bunch of intercommunicators into one group and have
a single communicator for it. FWIW, the intercommunicators are
point-to-point from several calls to MPI_Comm_join.
I *think* George Bosilca sent some sample code about this across one
of the OMPI lists (users or devel) a long time ago. I'm not 100% sure
about that, though...
I unfortunately forget the trick that he used. :-\
MPI_Group_union looks promising, but I cannot see any way of
retrieving the communicator given a group.
A communicator contains a group, not the other way around. You can
make a communicator from a group, though (see MPI_COMM_CREATE), but I
don't think it'll do what you want in this case.
--
Jeff Squyres
Cisco Systems
