req is a 2-way ping utility for myrinet on Cplant. It is run on a service in order to request that one compute node myrinet-ping another compute node and to report back the results. It takes as arguments, first, the node id of the machine to initiate the ping, and second, the node id of the machine receiving the ping. req relies on the Cplant rtscts myrinet driver/module running on all three machines in question.
req must be run as the superuser.