MPI on virtual nodes

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To run MPI on virtual nodes one has to specify the interface. The argument (to mpirun) needed is:

--mca btl_tcp_if_include tun0

Alternatively one may specify the network to be used for communication to cover both real and virtual node networks: --mca btl_tcp_if_include 192.168.100.0/23

Source for more knowledge: http://stackoverflow.com/questions/10466119/mpi-send-stops-working-after-mpi-barrier/10473106#10473106

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