Add --display-map to your mpirun cmd line On Apr 24, 2012, at 1:33 PM, Tom Rosmond wrote:
> Jeff, > > Yes, I would be interested in such a plugin. But be advised that I am > strictly a fortran programmer, so if it requires any C/C++ talent, I > would be in trouble. So maybe, before jumping into that, I would like > to be able to look at what processor/node mapping Open-mpi is actually > giving me. Is there an environmental variable or an MCA option I can > add to my 'mpirun' command line that would give that to me? I am > running 1.5.4. > > T. Rosmond > > > On Tue, 2012-04-24 at 15:11 -0400, Jeffrey Squyres wrote: >> On Apr 24, 2012, at 3:01 PM, Tom Rosmond wrote: >> >>> My question is this: If the cartesian mapping is done so the two >>> spacial dimensions are the 'most rapidly varying' in equivalent 1-D >>> processor mapping, will Open-mpi automatically assign those 2 dimensions >>> 'on-node', and assign the 'ensemble' dimension as the slowest varying >>> and across nodes? If not, how can we guarantee this to happen? >> >> >> Sadly, the MPI mapping functions in Open MPI are effectively no-ops -- if >> you ask for re-ordering, OMPI says "sure!" but then gives you back exactly >> the same mapping. :-( >> >> That being said, the mapping functionality is actually a plugin in Open MPI >> (in the "topo" framework). It would not be too difficult to write a plugin >> for the mapping that you want. >> >> Would this be of interest to you? I'd be happy to talk you through the >> process of writing such a plugin. >> > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
