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Subject: [OMPI devel] example/Hello_c.c : mpirun run failed on two physical nodes.
From: Wang,Yanfei(SYS) (wangyanfei01_at_[hidden])
Date: 2014-03-25 06:54:32


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_at_bb-nsi-ib04 examples]# mpirun -hostfile hosts -np 2 hello_c
The command just return instantly without nothing printed.
Local machine:
[root_at_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_at_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_at_bb-nsi-ib04.bb01.*.com Distribution, ident: 1.7.5, Mar 20, 2014, 108)
[root_at_bb-nsi-ib04 examples]#
-----peer machine is ok--------
[root_at_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_at_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_at_bb-nsi-ib03.bb01.*.com Distribution, ident: 1.7.5, Mar 20, 2014, 108)
[root_at_bb-nsi-ib03 examples]#
the command run successfully, and print two message!!

Configuration details:
OpenMPI version: 1.7.5
Hostfile:
[root_at_bb-nsi-ib04 examples]# cat hosts
ib03 slots=1
ib04 slots=1
[root_at_bb-nsi-ib04 examples]#
/etc/hosts:
[root_at_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