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Subject: Re: [OMPI users] using ompi-server on a single node
From: Terry Frankcombe (terry_at_[hidden])
Date: 2009-01-05 17:49:33


But why doesn't tcp work on loopback?

On Mon, 2009-01-05 at 07:25 -0700, Ralph Castain wrote:
> It is currently a known limitation - shared memory currently only
> works between procs from the same job. There is an enhancement coming
> that will remove this restriction, but it won't be out for some time.
>
> Ralph
>
> On Jan 5, 2009, at 1:06 AM, Thomas Ropars wrote:
>
> > Hi,
> >
> > I've tried to use ompi-server to connect 2 processes belonging to
> > different jobs but running on the same computer. It works when the
> > computer has a network interface up. But if the only active network
> > interface is the local loop, it doesn't work.
> >
> > According to what I understood reading the code, it is because no btl
> > component can be used in this case. "tcp" is not used because usually
> > it is the "sm" component that is used for processes on the same host.
> > But in that case it doesn't work because "sm" is supposed to work only
> > for processes of the same job.
> >
> > I know that this use-case is not very frequent :)
> > But Is there a solution to make it work ? or is it a known
> > limitation ?
> >
> > Regards
> >
> > Thomas
> >
> > _______________________________________________
> > users mailing list
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>
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