PTP Communication problems when using a single process

 
Hi,

I am confused about the the following. Any help'd be
appreciated.

I have a very simple program:

##########################
int id, ntasks, tag=100;
int msg[2];	
  
MPI::Init(argc, argv);
ntasks = MPI::COMM_WORLD.Get_size();	
id = MPI::COMM_WORLD.Get_rank();	

msg[0] = id;	
msg[1] = ntasks;

MPI::COMM_WORLD.Send(msg, 2, MPI::INT, 0, tag);
MPI::COMM_WORLD.Recv(msg, 2, MPI::INT, 0, tag);
  
MPI::Finalize();
###############################

The problem is that the same process is both sender
and receiver (I know that it does not make sense too
much, but I need to test something with this code). 

If I use ethernet (ch_p4), it works fine.  But running
it on myri core-dumps during receiving.

Does anybody have an idea what's happening?

Thanks in advance,

Eylul



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