Hi, I fall in a strange problem with OpenMPI 3.1 installed on a CentOS7 laptop. If no network is available I cannot launch a local mpi job on the laptop:
bash-4.2$ mpirun -np 4 hostname -------------------------------------------------------------------------- No network interfaces were found for out-of-band communications. We require at least one available network for out-of-band messaging. -------------------------------------------------------------------------- OpenMPI is built localy with Open MPI: 3.1.3rc1 Open MPI repo revision: v3.1.2-78-gc8e9819 Configure command line: '--prefix=/opt/GCC73/openmpi31x' '--enable-mpirun-prefix-by-default' '--disable-dlopen' '--enable-mca-no-build=openib' '--without-verbs' '--enable-mpi-cxx' '--without-slurm' '--enable-mpi-thread-multiple' I've tested some btl setup found with google but none solve the problem. bash-4.2$ mpirun -np 4 -mca btl ^tcp hostname or bash-4.2$ mpirun -np 4 -mca btl vader,self hostname Sarting a wifi connection (when it is available): bash-4.2$ mpirun -np 4 hostname localhost.localdomain localhost.localdomain localhost.localdomain localhost.localdomain Any suggestion is welcome Patrick
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