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Subject: Re: [OMPI users] ssh between nodes
From: Randall Svancara (rsvancara_at_[hidden])
Date: 2012-02-29 16:16:21


Depends on which launcher you are using. My understanding is that you can
use torque to launch the MPI processes on remote nodes, but you must
compile this support into OpenMPI. Please, someone correct me if I am
wrong.

For most clusters I work with and manage, we use passwordless keys. The
reason is that sometimes MPI implementations, like those provided by many
vendords do not supply the requisite functionality to integrate with
Torque, such as the Intel's OpenMPI tools or Comsol's bundled MPI
implementation as an example.

So really, it boils down to your needs.

Thanks

Randall

On Wed, Feb 29, 2012 at 1:09 PM, Denver Smith <denver.smith_at_[hidden]> wrote:

> Hello,
>
> On my cluster running moab and torque, I cannot ssh without a password
> between compute nodes. I can however request multiple node jobs fine. I was
> wondering if passwordless ssh keys need to be set up between compute nodes
> in order for mpi applications to run correctly.
>
> Thanks
>
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-- 
Randall Svancara
Know Your Linux? <http://www.knowyourlinux.com/>