I guess there is an inactive WG for generalized requests, but perhaps it makes more sense to discuss in the context of the active p2p or hybrid WG. Does anyone have any comments on this? The relevant ticket is https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/457. My motivation for revisiting this issue is that I've found a number of problems that can be addressed with MPICH-style generalized requests, including large-count nonblocking collectives. Thanks, Jeff -- Jeff Hammond [email protected] http://jeffhammond.github.io/