Hi Ha Chi do you use a batch scheduler with Rocks Cluster or do you log on the node with ssh ? If ssh, can you check that you can ssh from one node to the other without password ? Ping just says the network is alive, not that you can connect.
Patrick Le 04/06/2020 à 09:06, Hà Chi Nguyễn Nhật via users a écrit : > Dear Open MPI users, > > Please help me to find the solution for the problem using mpirun with > a ROCK cluster, 3 nodes. I use the command: > mpirun -np 12 --machinefile machinefile.txt --allow-run-as-root ./wrf.exe > But mpirun was unable to access other nodes (as the below photo). But > actually I checked the connection of three nodes by command "ping > node's IP", they are well connected. > 2.png > My machinefile.txt includes IP of three nodes (frontend and 2 > connected nodes), like this: > 10.1.85.1 slots=4 > 10.1.85.254 slots=4 > 10.1.85.253 slots=4 > > My cluster is built by a ROCK cluster, with 3 nodes, CPUS 8 per each node. > *My question is: How can I connect 3 nodes to run together?* > * > * > Please advise > Thanks > Ha Chi > > -- > *Ms. Nguyen Nhat Ha Chi* > PhD student > Environmental Engineering and Management > Asian Institute of Technology (AIT) > Thailand
