Hi, we want to setup a mpi-cluster with raspberry pis. The mpi-process run in a docker-container. That’s why we need to configure the ports, that mpi uses. We found the env flag MPI_PORT_RANGE / MPIEXEC_PORT_RANGE to configure the port range, that is used by mpi. Our problem is, that this flag has no impact to the running mpi-process: root@pi1:/mnt/docker# mpiexec -f machines -env MPIEXC_PORT_RANGE 10000:10100 -n 2 ./mpi-hello [proxy:0:1@pi2] HYDU_sock_connect (utils/sock/sock.c:172): unable to connect from "pi2" to "pi1" (Connection refused) [proxy:0:1@pi2] main (pm/pmiserv/pmip.c:189): unable to connect to server pi1 at port 35994 (check for firewalls!) We tried every other combination of mpirun/mipexec and MPICH_PORT_RANGE/ MPIEXEC_PORT_RANGE. Is there any other configuration needed or something, that we are missing to specify the used ports for mpi? Regards, Mark _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss