Running this command: guix shell python python-mpi4py openmpi -- mpirun -n 12 python3 \ -c "from mpi4py import MPI; comm = MPI.COMM_WORLD; print(comm.Get_rank())"
should print the numbers 0-11. Instead it prints 0 11 times. The same behavior occurs in a container or pure environment. This breaks any code using mpi4py, because ranks >0 must be available for multi-threaded code to work.
