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Subject: Re: [OMPI users] how to tell if opempi is using rsh or ssh
From: Reuti (reuti_at_[hidden])
Date: 2010-09-30 04:07:24

Am 30.09.2010 um 01:40 schrieb Borenstein, Bernard S:

> We are eliminating the use of rsh at our company and I'm trying to test out openmpi with the Nasa Overflow program using ssh.
> I've been testing other MPI's (MPICH1 and LAM/MPI) and if I tried to use rsh the programs would just die when running
> using PBS. I submitted my Overflow job using --mca plm_rsh_agent rsh and was surprised to see the job run.

You can check the real used communication method with on a node:

$ ps -e f

(f w/o -) which will give you the process tree layout. It might even be possible that you use the TM (task manager) which is built into PBS and even don't need ssh. For SGE I operate our clusters w/o rsh and ssh limited to admin staff, but with a tight integration it's still possible for users to run parallel programs (and they don't need passphraseless keys which I would suggest to replace with hostbased authentication anyway).

-- Reuti

> Does this setting fail over to ssh if rsh is not available or should it just use rsh only??? Also is there any command
> (this is a linux cluster) to see if ssh is being used. I'm trying to definitely make sure that it is using ssh and not rsh.
> rsh has been turned off on these nodes, so I'm pretty sure it's using ssh, but want to make sure.
> Thanx in advance for any help that can be provided.
> Bernie Borenstein
> The Boeing Company
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