Hi Doug, On 06/23/2010 08:01 AM, Douglas Miller wrote:

Right, the amount of code to maintain does increase, especially in the case that nothing is deprecated. My concern is for the performance of "common use" cases, which I think are where only one synchronization mode is used (is this not true? are there any "real" codes using this?).

From your description it is (somewhat) clear that the code complexity does increase, but to me it's not clear that it becomes more inefficient. Why does the possibility that an RMA operation might happen sometime later make it more inefficient? They way the MPI standard is structured is that RMA operations can happen anytime between Win_create/alloc and Win_free, which seems like an "epoch" in terms of your expectation. -- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji