Hello This bug is about L3 cache locality only, everything else should be fine, including cache sizes. Few applications use that locality information, so I assume it doesn't matter for PETSc scaling. We can work around the bug by loading a XML topology. There's no easy way to build that correct XML, but I can do it manually if you send your current broken topology (lstopo foo.xml and send this foo.xml).
Brice Le 27/10/2015 09:43, Fabian Wein a écrit : > Hello, > > I'm new to the list and new to the mpi-business, too. > > Our 4*12 Opteron 6238 system is very similar to the one from the > original poster and I get the same error message. > Any use in posting my logs? > > I compiled the latest hwloc, no change. our System is Ubunut 14.4 LTS > with kernel 3.13. and our bios is not updated. > > The system scales very fine with OpenMP but fails to give any > realistic scaling using PETSc (both for the standard > streaming benchmark and quick tests with a given application). > > As far as I understand the system is fine, just the information > gathering fails, right?! > > Do you know if the hwloc issue relates with our poor PETSc scaling? Is > there a way to configure the topology > manually? > > To me it appears that an bios update wouldn't help, right?! I wouldn't > try it if it is not nesessary. I'm a user with sudo accesss, > not an administrator but we have no admin for the system. > > Thanks, > > Fabian > _______________________________________________ > hwloc-users mailing list > hwloc-us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-users > Link to this post: > http://www.open-mpi.org/community/lists/hwloc-users/2015/10/1201.php
