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Subject: Re: [OMPI devel] [OMPI svn-full] svn:open-mpi r21292
From: George Bosilca (bosilca_at_[hidden])
Date: 2009-05-27 20:40:46


No there is no such constraint. Rainer's commit only changed the
hardcoded value to another define, which this time can be set by the
user at configure time. However, the default value is exactly the same
as before (for MPI hostnames is set to 256).

   george.

On May 27, 2009, at 20:02 , Ralph Castain wrote:

> I can't find that max hostname constraint in the above commit
> (probably just tired eyes). However, note that ORTE doesn't have any
> hostname length constraint, so if we are now adding one to the OMPI
> layer, we have a problem.
>
> For example, in the ompi_proc_t struct, we simply point it at the
> ORTE name so we avoid impacting the memory footprint by copying the
> hostname. Thus, it isn't clear to me -where- we are restricting
> hostname lengths - can someone point it out?
>
> FWIQ: we routinely see hostnames much longer than 16 chars on the
> user list and on many clusters here. Having such a small restriction
> will cause major problems with our user base.
>
>
>
> On Wed, May 27, 2009 at 8:11 AM, Jeff Squyres <jsquyres_at_[hidden]>
> wrote:
> On May 27, 2009, at 9:54 AM, Rainer Keller wrote:
>
> > One thing to note about this change is that it will break binary
> > compatibility between 1.3/1.4 and the 1.5/1.6 series (since these
> > values are #define's, and therefore are resolved at compile time --
> > not run-time).
> Where's the break??
>
>
> My bad -- you're entirely right. I mis-read; you kept all the
> defaults exactly the same. Good!
>
> Several of my other comments are therefore invalid. :-) But the
> _OPAL_ -> OPAL_ prefix thing is still relevant (that would be the
> only _OPAL prefix that I'm aware of).
>
> --
> Jeff Squyres
> Cisco Systems
>
>
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