Hi, I am a fresh learner of OpenMPI programmer, and have some troubles on building mpi programming, hope some helps..
The example/helloc_c can works successfully with 2 process on local machine, however, do not work on two separate physical node. Physical two nodes: Eg: [root@bb-nsi-ib04 examples]# mpirun -hostfile hosts -np 2 hello_c The command just return instantly without nothing printed. Local machine: [root@bb-nsi-ib04 examples]# mpirun -np 2 hello_c Hello, world, I am 0 of 2, (Open MPI v1.7.5, package: Open MPI root@bb-nsi-ib04.bb01.*.com Distribution, ident: 1.7.5, Mar 20, 2014, 108) Hello, world, I am 1 of 2, (Open MPI v1.7.5, package: Open MPI root@bb-nsi-ib04.bb01.*.com Distribution, ident: 1.7.5, Mar 20, 2014, 108) [root@bb-nsi-ib04 examples]# -----peer machine is ok-------- [root@bb-nsi-ib03 examples]# mpirun -np 2 hello_c Hello, world, I am 0 of 2, (Open MPI v1.7.5, package: Open MPI root@bb-nsi-ib03.bb01.*.com Distribution, ident: 1.7.5, Mar 20, 2014, 108) Hello, world, I am 1 of 2, (Open MPI v1.7.5, package: Open MPI root@bb-nsi-ib03.bb01.*.com Distribution, ident: 1.7.5, Mar 20, 2014, 108) [root@bb-nsi-ib03 examples]# the command run successfully, and print two message!! Configuration details: OpenMPI version: 1.7.5 Hostfile: [root@bb-nsi-ib04 examples]# cat hosts ib03 slots=1 ib04 slots=1 [root@bb-nsi-ib04 examples]# /etc/hosts: [root@bb-nsi-ib04 examples]# cat /etc/hosts 192.168.71.3 ib03 192.168.71.4 ib04 SSH: Public rsa key is redistributed two machine, ib03 and ib04, and to do ssh login in without password is ok, I am sure. I am confused about this trouble, and anyone can help us? It have nothing log and error tip, could anyone tell me how to do diagnose it. BR Yanfei Wang
