in each case, if get_nbobjs_by_type return 0, also if the machine is NUMA, hwloc can't build the NUMA-aware topolog, so the NUMA capability is not usable. Is it right?

2011/8/28 Samuel Thibault <samuel.thibault@inria.fr>

Brice Goglin, le Sun 28 Aug 2011 12:36:31 +0200, a écrit :

> > Is there a hwloc routine to check this?
>

> get_nbobjs_by_type(topology, HWLOC_OBJ_NODE) tells how many NUMA node
> objects exist.
> If you get >1, the machine is NUMA.
> If the non-NUMA case, I think you can get 0 or 1 depending on whether
> the OS is NUMA-aware or not (not sure we should remove this possible
> difference).

The useful difference is that 0 means we don't know, while 1 means we do
know there is only one node.

Samuel

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