Hi Brendan I doubt this kind of config has gotten any testing with OMPI. Could you rerun with
--mca btl_base_verbose 100 added to the command line and post the output to the list? Howard Brendan Myers <brendan.my...@soft-forge.com> schrieb am Fr. 20. Jan. 2017 um 15:04: > Hello, > > I am attempting to get Open MPI to run over 2 nodes using a switch and a > single breakout cable with this design: > > (100GbE)QSFP ßà 2x (50GbE)QSFP > > > > Hardware Layout: > > Breakout cable module A connects to switch (100GbE) > > Breakout cable module B1 connects to node 1 RoCE NIC (50GbE) > > Breakout cable module B2 connects to node 2 RoCE NIC (50GbE) > > Switch is Mellanox SN 2700 100GbE RoCE switch > > > > · I am able to pass RDMA traffic between the nodes with perftest > (ib_write_bw) when using the breakout cable as the IC from both nodes to > the switch. > > · When attempting to run a job using the breakout cable as the IC > Open MPI aborts with failure to initialize open fabrics device errors. > > · If I replace the breakout cable with 2 standard QSFP cables the > Open MPI job will complete correctly. > > > > > > This is the command I use, it works unless I attempt a run with the > breakout cable used as IC: > > *mpirun --mca btl openib,self,sm --mca btl_openib_receive_queues > P,65536,120,64,32 --mca btl_openib_cpc_include rdmacm -hostfile > mpi-hosts-ce /usr/local/bin/IMB-MPI1* > > > > If anyone has any idea as to why using a breakout cable is causing my jobs > to fail please let me know. > > > > Thank you, > > > > Brendan T. W. Myers > > brendan.my...@soft-forge.com > > Software Forge Inc > > > _______________________________________________ > > users mailing list > > users@lists.open-mpi.org > > https://rfd.newmexicoconsortium.org/mailman/listinfo/users
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