On 06/16/2013 10:02 AM, Jim Dinan wrote:

If the channel is unordered, a message after the iflush can increment the counter, while one before the iflush has not yet completed. So, the counter is not enough to mark a particular point in time.

Ah, good point.

An implementation of iflush as flush should still be valid, right? Just

No. You cannot do this if the user only uses TEST. MPI_WIN_IFLUSH(&req); while (MPI_TEST(req) is not done); -- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji