Hi there, My application uses MPI to run parallel jobs on a single node, so I have no need of any support for communication between nodes. However, when I use mpirun to launch my application I see strange errors such as:
-------------------------------------------------------------------------- No network interfaces were found for out-of-band communications. We require at least one available network for out-of-band messaging. -------------------------------------------------------------------------- [nid23206:10697] [[33772,1],0] ORTE_ERROR_LOG: Unable to open a TCP socket for out-of-band communications in file oob_tcp_listener.c at line 113 [nid23206:10697] [[33772,1],0] ORTE_ERROR_LOG: Unable to open a TCP socket for out-of-band communications in file oob_tcp_component.c at line 584 -------------------------------------------------------------------------- It looks like orte_init failed for some reason; your parallel process is likely to abort. There are many reasons that a parallel process can fail during orte_init; some of which are due to configuration or environment problems. This failure appears to be an internal failure; here's some additional information (which may only be relevant to an Open MPI developer): orte_oob_base_select failed --> Returned value (null) (-43) instead of ORTE_SUCCESS -------------------------------------------------------------------------- /home/leeping/opt/qchem-4.2/ext-libs/openmpi/lib/libmpi.so.1(+0xfeaa9)[0x2b77e9de5aa9] /home/leeping/opt/qchem-4.2/ext-libs/openmpi/lib/libmpi.so.1(ompi_btl_openib_connect_base_select_for_local_port+0xd0)[0x2b77e9de13a0] It seems like in each case, OpenMPI is trying to use some feature related to networking and crashing as a result. My workaround is to deduce the components that are crashing and disable them in my environment variables like this: export OMPI_MCA_btl=self,sm export OMPI_MCA_oob=^tcp Is there a better way to do this - i.e. explicitly prohibit OpenMPI from using any network-related feature and run only on the local node? Thanks, - Lee-Ping
