FW: [torqueusers] help with use of PVM with Torque

Egan Ford egan at sense.net
Thu Dec 1 09:20:30 MST 2005


export PVM_RSH=/usr/bin/ssh to use ssh.

> -----Original Message-----
> From: torqueusers-bounces at supercluster.org 
> [mailto:torqueusers-bounces at supercluster.org] On Behalf Of 
> Mikko Huhtala
> Sent: Thursday, December 01, 2005 2:47 AM
> To: torqueusers at supercluster.org
> Subject: Re: FW: [torqueusers] help with use of PVM with Torque
> 
> 
> Chris Samuel writes:
>  > On Thursday 01 December 2005 06:48, 
> Daniel.G.Roberts at sanofi-aventis.com wrote:
>  > 
>  > > The trick is to start the master pvmd on a compute node 
> and then add the
>  > > slaves..
>  > 
>  > The problem is that I believe that it uses rsh/ssh 
> internally to launch those 
>  > slaves on other compute nodes and the cluster has rsh/ssh 
> completely 
>  > disabled. :-(
>  > 
>  > I was wondering if you could use mpiexec to launch the pvm 
> daemons, but I 
>  > don't know enough about PVM to know whether it could work..
>  > 
> 
> We got around this problem by allowing rsh without passwords between
> the batch nodes, but denying it from anywhere else, including the
> interactive nodes. This is easy to do with xinetd and sshd
> configuration (root is allowed to ssh everywhere, of course). This
> way, the pvm daemons can be started and killed from the job script. As
> far as I know, the current version of PVM does not work with anything
> else besides rsh.
> 
> The problem is that this setup allows the users to bypass the batch
> system by writing a job script that uses rsh to launch processes the
> batch nodes. We have relatively few users and they can more or less be
> trusted, so this setup has worked for us.
> 
> Mikko
> 
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