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Subject: Re: [OMPI users] How are the Open MPI processes spawned?
From: Ralph Castain (rhc_at_[hidden])
Date: 2011-12-06 15:40:25


I'll take a look at having the rsh launcher forward MCA params up to the cmd line limit, and warn if there are too many to fit. Shouldn't be too hard, I would think.

On Dec 6, 2011, at 1:28 PM, Paul Kapinos wrote:

> Hello Jeff, Ralph, all!
>
>>>> Meaning that per my output from above, what Paul was trying should have worked, no? I.e., setenv'ing OMPI_<whatever>, and those env vars should magically show up in the launched process.
>>> In the -launched process- yes. However, his problem was that they do not show up for the -orteds-, and thus the orteds don't wireup correctly.
>
> Sorry for latency, too many issues on too many area needing improvement :-/
> Well, just to clarify the long story about what I have seen:
>
> 1. got a strange start-up problem (based on bogus configuration of eth0 + known (for you, experts :o) bug in /1.5.x
>
> 2. got a workaround for (1.) by setting '-mca oob_tcp_if_include ib0 -mca btl_tcp_if_include ib0' on the command line of mpiexec => WORKS! Many thanks guys!
>
> 3. remembered that any MCA Parameters can also be defined over OMP_MCA_... envvars, tried out to set => works NOT, the hang-ups were again here. Checking how the MCA parameters are set by ompi_info - all clear, but doesn't work. My blind guess was, mpiexec does not understood there envvars in this case.
> See also http://www.open-mpi.org/community/lists/users/2011/11/17823.php
>
> Thus this issue is not about forwarding some or any OMPI_* envvars to the _processes_, but on someone step _before_ (the processes were not started correctly at all in my problem case), as Ralph wrote.
>
> The difference in behaviour if setting parameters on command line or over OMPI_*envvars matters!
>
>
> Ralph Castain wrote:
> >> Did you filed it, or someone else, or should I do it in some way?
> > I'll take care of it, and copy you on the ticket so you can see
> > what happens. I'll also do the same for the connection bug
> > - sorry for the problem :-(
>
> Ralph, many thanks for this!
>
> Best wishes and a nice evening/day/whatever time you have!
>
> Paul Kapinos
>
>
>
>
> --
> Dipl.-Inform. Paul Kapinos - High Performance Computing,
> RWTH Aachen University, Center for Computing and Communication
> Seffenter Weg 23, D 52074 Aachen (Germany)
> Tel: +49 241/80-24915
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