Well, almost. Recall that one of the benefits of splitting the spawn from the
creation of the intercommunicator is that it gives us the SPAWN_MULTIPLE
semantics basically for free. In the new proposal, we don't know at spawn time
whether we'll be spawning additional groups and merging with them, so we can't
really build the new MPI_COMM_WORLD for the children until the attach/detach.
But in the common case we will probably not(?) be spawning multiple groups, so
an implementation might simply create a communicator for every spawned group
and then just merge them later if needed.
-- Eric Salo Silicon Graphics Inc. "Do you know what the (415)933-2998 2011 N. Shoreline Blvd, 7L-802 last Xon said, just email@example.com Mountain View, CA 94043-1389 before he died?"