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 list > hwloc-devel@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/hwloc-devel
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