If you're compiling Open MPI from source, you need the -devel package so that the libnuma header files are installed (and therefore Open MPI [i.e., the hwloc embedded in Open MPI] can include those header files and then compile support for libnuma).
Can I also test the numa capability via a hwloc command line tool? I tried it also with configuring open-mpi to use my manually built hwloc, it didn't change anything.
Fabian
