Dear all, Howard, Dan, and I discussed the binding problem on Monday during the sessions WG time slot (thanks again for the time and input) and we came to quite a change in direction this errata is going. We were discussing what was available when for predefined handles (contemplating what *link-time constant* means) and live-testing a bit with Open-MPI. Result was that a test with MPI_Comm comm = MPI_COMM_WORLD; MPI_Init(...); MPI_Send(..., comm); works as we would expect from a link-time constant, in that the value (of the handle, not necessarily the object behind it) is known to MPI before Init and does not change. That gave rise to the question, "If that is possible, what prevents the implementation of 'lazy binding' for an MPI libary?" So this would be a question to all implementors on the list. I updated the Errata with a new suggested text (now actually allowing binding to predefined handles at any time between MPI_T initialization and finalization, as a start for discussing this thoroughly before September. https://github.com/mpi-forum/mpi-standard/pull/161/files#diff-f6fa82f9df45c2... The core idea here is that, as a library should always be able to tell apart a predefined handle from a user-defined one, it could catch any binding and postpone it until the handle is initialized. Cheers, Marc-Andre -- Dr. rer. nat. Marc-André Hermanns IT Center Group: High Performance Computing Division: Computational Science and Engineering RWTH Aachen University Seffenter Weg 23 52074 Aachen Phone: +49 241 80-24381 [email protected] www.itc.rwth-aachen.de