If you are going to allow windows with different communicators, then you might as well use separate fence calls. Otherwise, you are introducing a brand-new kind of object - one that involves the union of non-disjoint groups of processes. I don’t think this is a good idea. Bill William Gropp Director, Parallel Computing Institute Thomas M. Siebel Chair in Computer Science University of Illinois Urbana-Champaign On Aug 8, 2014, at 10:50 AM, Rolf Rabenseifner <[email protected]> wrote:

Dynamic Windows also require that all have the same communicator (because same win handle).