I have a hello world program that runs without prompting for password with plm_rsh_agent but not with orte_rsh_agent, I mean it runs but only after prompting for a password:

<path>/bin/mpirun --machinefile mpihosts.dat -np 16 -mca plm_rsh_agent /usr/bin/rsh ./test_setup

Hello from process            2

Hello from process            5

Hello from process           12

Hello from process            6

Hello from process            0

Hello from process            4

Hello from process            3

Hello from process            7

Hello from process           14

Hello from process            8

Hello from process            1

Hello from process            9

Hello from process     &n bsp;     10

Hello from process           11

Hello from process           13

Hello from process           15

<path>bin/mpirun --machinefile mpihosts.dat -np 16 -mca orte_rsh_agent /usr/bin/rsh./test_setup

bloscel@f8312's password:        

I didn’t notice anything about this in the FAQ except that orte_rsh_agent is newer than plm_rsh_agent.  Did I miss some critical piece of information?  Why do these options behave differently?

Thanks