[ofa-general] Re: [OpenSM] How to find active routing algorithm ?

[Ira Weiny]

I think the "easiest" method at this time is to use the console via an expect
script on the SM node.  Get the routing algo out of the console output (see
"status" command).  Then have that script "push" this information to all the
nodes to be cached.  Compute nodes then simply look at this file.

You could set up a cron job to do this periodically although once OpenSM is run
it should not change.  But this would separate this script from having to know
when OpenSM is restarted...

That said, I really don't know why user jobs need to know this information.
But right now the best way to get it is via the console.

Ira

On Wed, 18 Jun 2008 16:57:45 +0530
"Keshetti Mahesh" <keshetti.mahesh at gmail.com> wrote:

> Thanks for your replies.
> 
> > If that were to be done, it would need to be done via a vendor specific
> > SM query as there is no standard for IB routing algorithms or reporting
> > this to other nodes. It would not work with other SMs or prior OpenSMs.
> > Is this really needed over IB ? Isn't some remote access to the SM node
> > sufficient for this and then use one of the methods previously described
> > on the list ?
> 
> Yes, all the above methods are sufficient to find out the active
> routing algorithm
> if the user has the remote access to the SM node. But in our subnet, SM node
> is also a compute node and when some user reserves that node for running jobs
> no one else except 'root' is allowed to enter that node. There I am
> facing the problem.
> 
> -Mahesh
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