I agree with Terry and Eugene, but now what are we going to do about it? This is a potentially very powerful feature.
Ken > -----Original Message----- > From: devel-boun...@open-mpi.org > [mailto:devel-boun...@open-mpi.org] On Behalf Of Terry Dontje > Sent: Tuesday, October 13, 2009 7:08 AM > To: Open MPI Developers > Subject: Re: [OMPI devel] [OMPI users] cartofile > > After rereading the manpage for the umpteenth time I agree > with Eugene > that the information provided on cartofile is next to > useless. Ok, so > you describe what your node looks like but what does mpirun > or libmpi do with that information? Other than the option to > provide the cartofile it isn't obvious how a user or libmpi > uses this information. > > I've looked on the faq and wiki and have not found anything > yet on how one "current" uses cartofile. > > --td > > Eugene Loh wrote: > > This e-mail was on the users alias... see > > http://www.open-mpi.org/community/lists/users/2009/09/10710.php > > > > There wasn't much response, so let me ask another question. > How about > > if we remove the cartofile section from the DESCRIPTION > section of the > > OMPI mpirun man page? It's a lot of text that illustrates how to > > create a cartofile without saying anything about why one > would want to > > go to the trouble. What does this impact? What does it change? > > What's the motivation for doing this stuff? What's this > stuff good for? > > > > Another alternative could be to move the cartofile description to a > > FAQ page. > > > > The mpirun man page is rather long and I was thinking that > if we could > > remove some "low impact" stuff out, we could improve the overall > > signal-to-noise ratio of the page. > > > > In any case, I personally would like to know what > cartofiles are good for. > > > > Eugene Loh wrote: > >> Thank you, but I don't understand who is consuming this > information > >> for what. E.g., the mpirun man page describes the carto file, but > >> doesn't give users any indication whether they should be worrying > >> about this. > >> > >> Lenny Verkhovsky wrote: > >>> Hi Eugene, > >>> carto file is a file with a staic graph topology of your node. > >>> in the opal/mca/carto/file/carto_file.h you can see example. > >>> ( yes I know that , it should be help/man list :) ) Basically it > >>> describes a map of your node and inside interconnection. > >>> Hopefully it will be discovered automatically someday, > but for now > >>> you can describe your node manually. > >>> Best regards > >>> Lenny. > >>> > >>> On Thu, Sep 17, 2009 at 12:38 AM, Eugene Loh <eugene....@sun.com > >>> <mailto:eugene....@sun.com>> wrote: > >>> > >>> I feel like I should know, but what's a cartofile? I > guess you > >>> supply "topological" information about a host, but I > can't tell > >>> how this information is used by, say, mpirun. > >>> > > > ---------------------------------------------------------------------- > > -- > > > > _______________________________________________ > > devel mailing list > > de...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/devel > > > > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel
