Well, now it's more clear.
Thanks for the informations! Regards. 2011/8/4 Samuel Thibault <samuel.thiba...@inria.fr> > Gabriele Fatigati, le Thu 04 Aug 2011 16:56:22 +0200, a écrit : > > L#0 and L#1 are physically near because hwloc consider shared caches map > when > > build topology? > > Yes. That's the whole point of sorting objects topologically first, and > numbering them afterwards. See the glossary entry for "logical index": > > “The ordering is based on topology first, and then on OS CPU numbers” > > I.e. OS CPU numbers are only used when no topology information (shared > cache etc.) provides any better sorting. > > > Because if not, i don't know how hwloc understand the physical > > proximity of cores :( > > Physical proximity of cores does not mean logical proximity. cores can > be next one to the other, and still share no cache at all. Forget the > expression "physical proximity", it does not provide any interesting > information. What matters is logical proximity. And that's *precisely* > what logical indexes express. > > Samuel > _______________________________________________ > hwloc-users mailing list > hwloc-us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-users > -- Ing. Gabriele Fatigati HPC specialist SuperComputing Applications and Innovation Department Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy www.cineca.it Tel: +39 051 6171722 g.fatigati [AT] cineca.it
