Ha Chi, first running MPI applications as root in not a good idea. You must create users in your rocks cluster without admin rights for all that is not system management.
Let me know a little more about how you launch this: 1) Do you run "mpirun" from the rocks frontend or from a node ? 2) Ok from ssh from the frontend to the node but BETWEEN 2 nodes ? Patrick Le 04/06/2020 à 10:02, Hà Chi Nguyễn Nhật a écrit : > Dear Patrick, > Thanks so much for your reply, > Yes, we use ssh to log on the node. From the frontend, we can ssh to > the nodes without password. > the mpirun --version in all 3 nodes are identical, openmpi 2.1.1, and > same place when testing with "whereis mpirun" > So is there any problem with mpirun causing it to not launch to other > nodes? > > Regards > HaChi > > On Thu, 4 Jun 2020 at 14:35, Patrick Bégou via users > <users@lists.open-mpi.org <mailto:users@lists.open-mpi.org>> wrote: > > 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 > > > > > -- > *Ms. Nguyen Nhat Ha Chi* > PhD student > Environmental Engineering and Management > Asian Institute of Technology (AIT) > Thailand
