Problem with MPIRUN run on multi-nodes Under LINUX

HI, Dear Sir or Madam,

I am testing the Intel MPI benchmar under RedHat Linux with 2 computers: node1-rh(8 cores) and node2-rh(8 cores). After I enter the following command on the local node1-rh:

bash-4.1$ mpirun -hosts node2-rh, node1-rh -np 16 IMB-MPI1
dingjun@node1-rh's password:

*********

IMB-MPI1 did not run. This indicates the IMB-MPI1 did not run on the remote computer node2-rh.

Could you experience such a problem? please tell my your ideas on how to run a executable file on multi-nodes under Linux with the Intel MPI library. Thanks in advance.

Have a good day and I look forward to hearing from you.