[OMPI devel] Dropped message for the non-existing communicator

[Terry Dontje]

I am seeing the message "Dropped message for the non-existing 
communicator" when running hpcc with np=124 against r19845.  This seems 
to be pretty reproducible at np=124.  When the job prints out the 
message above some set of processes are in an MPI_Bcast and the 15 
processes reporting the message are stuck in MPI_Barrier. 

I am not sure how related this is to #1408 since I am not invoking the 
hierarchical collectives.  I just wanted to see if anyone else has tried 
to run hpcc at such an np size with any success.

My next steps are to try to run this with the latest trunk and to narrow 
down the failing case.

--td