rroute is a 2-way ping utility for myrinet on Cplant. It is run on a service or compute node to test myrinet connectivity via a specified route. It takes as argument a space-separated list of route bytes in the form 0xST where S and T are hex digits. This list is intended to form a valid myrinet path to some destination node in the myrinet netowrk.
rroute is a C program that makes ioctl() calls to the portals and rtscts devices.
rroute is similar to the vping utility except that, on the command line, it takes a route rather than a node id. It sends an RPING message to the node in question, waits for an ack (for a hardcoded time interval), and reports on the result.
rroute is also similar to aroute which sends an APING message. The difference is in the action of the receiving node. For an RPING message, the return route is parsed out of the message itself -- it is the reverse of the route used to send the message. When a destination node receives an APING messages it parses out the sender's node id and the return route is the one indexed by that id in it's in-memory routing table.
rroute must be run as the superuser.