Thanks Brice for the detailed info. So, can I say that if obj->nodeset is all 1s, it is a no NUMA mode setup?
Thanks, Swati On Monday, September 26, 2016, Brice Goglin <brice.gog...@inria.fr> wrote: > Hello > > If there's no NUMA node object in your hwloc topology, it means your > machine isn't NUMA (there's a single NUMA node), or your system doesn't > report NUMA information at all (missing NUMA support in the kernel, etc). > > This is an old design choice that is not convenient. So we'll change that > in the upcoming hwloc 2.0. There will always be at least one NUMA node > object (just like in lspcu). > > In the meantime, the meaning of obj->nodeset isn't very useful when > there's no NUMA object anyway. If you really need to look at obj->nodeset > on non-NUMA machines, you'll get either NULL or a "full" "infinite" bitmap > (meaning "the entire machine memory", as explained in the description of > the nodeset attribute of the object structure https://www.open-mpi.org/ > projects/hwloc/doc/v1.11.4/a00038.php#a08f0d0e16c619a6e653526cbee4ffea3). > > By the way, you're not supposed to look at internal nodeset fields (ulongs > and ulongs_count). For instance, there's another field saying that the > bitmap is infinite. All these are private details not meant to be > understood by users. Things like hwloc_bitmap_asprintf() or "lstopo -.xml" > would show that obj->nodeset is 0xf...f which means "infinite" or "full". > > Again, these infinite nodesets will go away in the upcoming hwloc 2.0. > > Brice > > > > > > > Le 27/09/2016 01:35, Swati Agrawal a écrit : > > Hi All, > > I have recently started using hwloc and stuck with a case where there are > no NUMA nodes. I see that when i run "lscpu" command, it shows me there is > 1 Numa Node and all the PUs are in this node. > But when i try reading the nodeset for my object using > hwloc_get_non_io_ancestor_obj(..), I see below output: > > obj->nodeset->ulongs_count = 1; > obj->nodeset->ulongs[0] = 18446744073709551615 (UINT64 MAX Value). > > What does this actually mean? > > Thanks, > Swati > > > _______________________________________________ > hwloc-devel mailing listhwloc-de...@lists.open-mpi.org > <javascript:_e(%7B%7D,'cvml','hwloc-devel@lists.open-mpi.org');>https://rfd.newmexicoconsortium.org/mailman/listinfo/hwloc-devel > > >
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