Im getting “ibv_create_qp: returned 0 byte(s) for max inline data” errors; what is this, and how do I fix it?
Prior to Open MPI v1.0.2, the OpenFabrics (then known as “OpenIB”) verbs BTL component did not check for where the OpenIB API could return an erroneous value (0) and it would hang during startup. Starting with v1.0.2, error messages of the following form are reported: [0,1,0][btl_openib_endpoint.c:889:mca_btl_openib_endpoint_create_qp] ibv_create_qp: returned 0 byte(s) for max inline data This is caused by an error in older versions of the OpenIB user library. Upgrading your OpenIB stack to recent versions of the OpenFabrics software should resolve the problem. See this post on the Open MPI user’s list for more details: http://www.open-mpi.org/community/lists/users/2006/03/0737.php 20. My bandwidth seems [far] smaller than it should be; why? Can this be fixed? Open MPI, by default, uses a pipelined RDMA protocol. Additionally, in the v1.0 series of Open MPI, small messages use send/receive semantics (instead of RDMA — small message RDMA was added in the v1.1 series). For some applicat
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