[OMPI users] Open MPI process cannot do send-receive message correctly on a distributed memory cluster

[Jack Bryan]

Hi, 

I have a Open MPI program, which works well on a Linux shared memory multicore 
(2 x 6 cores) machine.

But, it does not work well on a distributed cluster with Linux Open MPI.

I found that the the process sends out some messages to other processes, which 
can not receive them. 

What is the possible reason ? 

I do not change anything of the program. 

Any help is really appreciated. 

Thanks