Dear MPI people,
                               Can someone tell me why MPI_Ssend takes more time when two MPI processes are on same node ...... ?? the same two processes on different nodes take much less time for the same message exchange. I am using a supercomputing center and this happens. I was writing an algorithm to reduce the across node communication. But now I found that across node communication is cheaper than communication within a node (with 8 cores on each node).

best regards,