[OMPI users] Recommended tool to measure packet counters

Is there a preferred method/tool among developers of MPI-library for checking the count of the packets transmitted by the network card during two-sided communication? Is the use of iptables -I INPUT -i eth0 iptables -I OUTPUT -o eth0 recommended ? Thanks, Siddhartha

[OMPI users] Configuration for rendezvous and eager protocols: two-sided comm

Hi In OpenMPI, are MPI_Send, MPI_Recv (and friends) implemented using rendezvous protocol or eager protocol? If both, is there a way to choose one or the other during runtime or while building the library? If there is a threshold of the message size that dictates the protocol to be used, is ther