I want to try that tomorrow. Currently I use open-mpi, ist it worth buying intel-mpi? We have the C++ and Fortran compilers but not mpi up to now.
Might it be an issue with the hwloc xml file? My idea is, if it would help to temporarily install an older kernel - 3.2 was reported to work - and get the xml file for exactly my machine by a working hwloc. Might this work? Anyway, I’ll learn from experimenting with this stuff and will understand our machine better which might end up in more efficient coding in the end :) Thanks for your help Brice and to the community, Fabian > Am 27.10.2015 um 16:05 schrieb Brice Goglin <brice.gog...@inria.fr>: > > I guess the next step would be to look at how these tasks are placed on > the machine. There are 8 NUMA nodes on the machine. Maybe 9 is where it > starts placing a second task per NUMA node? > For OMPI, --report-bindings may help. I am not sure about MPICH. > > Brice > > > > Le 27/10/2015 15:52, Fabian Wein a écrit : >> On 10/27/2015 03:42 PM, Brice Goglin wrote: >>> I guess the problem is that your OMPI uses an old hwloc internally. That >>> one may be too old to understand recent XML exports. >>> Try replacing "Package" with "Socket" everywhere in the XML file. >> >> Thanks! That was it. >> >> I now get almost perfectly reproducible results. >> >> np speedup >> 1 1.0 >> 2 1.99 >> 3 2.98 >> 4 3.98 >> 5 4.89 >> 6 5.9 >> 7 6.89 >> 8 7.87 >> 9 5.44 >> 10 6.04 >> 11 6.55 >> 12 7.0 >> 13 7.75 >> 14 8.24 >> 15 8.41 >> 16 9.4 >> 17 7.33 >> 18 7.16 >> 19 8.05 >> 20 8.39 >> >> What still puzzles me is the almost perfect speedup up to eight and >> than the >> drop down. But for the beginning 8 is already good! >> >> Thanks again, >> >> 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/2015/10/1210.php > > _______________________________________________ > 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/2015/10/1210.php
