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Subject: Re: [OMPI devel] Fwd: [OMPI svn-full] svn:open-mpi r21686
From: Ralph Castain (rhc_at_[hidden])
Date: 2009-07-15 15:50:53


The routed comm system relies on each daemon having complete information as
to where every process is located, so the expectation was that only full
maps would ever be sent. Thus, the nidmap code is setup to always send a
full map.

I don't know how to even generate a "partial" map. I assume you are doing
something offline? Is this to update changed info? If so, you'll also have
to do something to update the daemon's maps or the comm system will break
down.

Ralph

On Wed, Jul 15, 2009 at 1:40 PM, George Bosilca <bosilca_at_[hidden]>wrote:

> I have a question regarding the mapping. How can I declare a partial
> mapping ? In fact I only care about how some of the processes are mapped on
> some specific nodes. Right now if the rmaps doesn't contain information
> about all nodes, we give up (before this patch we segfaulted).
>
> Does it means we always have to declare the whole mapping or it's just that
> we overlooked this strange case?
>
> george.
>
> Begin forwarded message:
>
> Author: bosilca
>> Date: 2009-07-15 15:36:53 EDT (Wed, 15 Jul 2009)
>> New Revision: 21686
>> URL: https://svn.open-mpi.org/trac/ompi/changeset/21686
>>
>> Log:
>> Reorder the nidmap encoding function. Add a check to make sure we don't
>> write
>> outside the boundaries of the allocated array.
>>
>> However, the problem is still there. If we have rmaps file containing only
>> partial information the num_procs get set to the wrong value (the number
>> of
>> hosts in the rmaps file instead of the number of processes requested on
>> the
>> command line).
>>
>
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