On 12/27/2012 12:56 PM US Central Time, Jeff Hammond wrote:

I don't disagree with your interpretation, but I am always hesitant to assert my understanding of the text in the absence of input from those who were present when it was written.

I'll file an MPI Forum ticket and see what happens.

This does look like something that's ill-defined in the standard. A ticket to address in MPI-3.1 is a good idea. Lisandro: till this is fixed in the standard, the workaround will be to commit all datatypes. -- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji