We intend to provide support for a default MPI_COMM_SELF implementation of shared memory windows in ch3. Shared memory windows are fully implemented in Nemesis, but not ch3, so if you were to try using them right now with sock, you would get a not implemented error. If anyone needs this (presumably for portability), I'd be happy to bump the priority on ticket #1666.

How is this not a no-op implementation for MPI_COMM_SELF? All you need to support is load-store on local memory, no? Jeff -- Jeff Hammond Argonne Leadership Computing Facility University of Chicago Computation Institute [email protected] / (630) 252-5381 http://www.linkedin.com/in/jeffhammond https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond