Greetings Mike. I'll answer today because Fri-Sat is the weekend in Israel (i.e., the MPI team at Mellanox won't see this until Sunday).
I don't have a lot of experience with RoCE; do you need a different GUID or a different subnet ID? At least in IB, the GID = GUID + Subnet ID. The GUID should be your unique port ID and the subnet ID is, well, the subnet ID. :-) Changing either of these in IB is an administrative function, not a user-level function. Meaning: I'm *guessing* that the same is true for RoCE -- changing the subnet ID (which is what I'm further guessing you need to do) should be somewhere in the root-level setup for RoCE. Once you set a different subnet ID, Open MPI should just use it. On Feb 18, 2011, at 8:17 AM, Michael Shuey wrote: > I've been looking into OpenMPI's support for RoCE (Mellanox's recent > Infiniband-over-Ethernet) lately. While it's promising, I've hit a > snag: RoCE requires lossless ethernet, and on my switches the only way > to guarantee this is with CoS. RoCE adapters cannot emit CoS priority > tags unless the client program selects an IB service level and uses a > non-default GID. > > There's a command-line option in OpenMPI to pick an IB SL, but I can't > find one for picking a different GID. Does this exist for the openib > btl? Or am I going about this the wrong way? > > -- > Mike Shuey > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
