"PU P#0" means "PU object with physical index 0".
"P#" prefix means "physical index".
"L#" prefix means "logical index" (the one you want to use in get_obj_by_type).
Use -l or -p to switch from one to the other in lstopo.

Brice



Le 01/08/2011 14:47, Gabriele Fatigati a écrit :
Hi Brice,

so, if I inderstand well, PU P# numbers are not  the same specified  as HWLOC_OBJ_PU flag?

2011/8/1 Brice Goglin <Brice.Goglin@inria.fr>
Le 01/08/2011 12:16, Gabriele Fatigati a écrit :
> Hi,
>
> reading a hwloc-v1.2-a4 manual, on page 15, i look an example
> with 4-socket 2-core machine with hyperthreading.
>
> Core id's are not exclusive as said before. PU's id are exclusive but
> not physically sequential (I suppose)
>
> PU P#0 is in socket P#0 on Core P#0. PU P#1 is in another socket!

These indexes are "physical indexes" (that's the default in the
graphical lstopo output). But we may want to make that clearer in the doc.

Brice




--
Ing. Gabriele Fatigati

Parallel programmer

CINECA Systems & Tecnologies Department

Supercomputing Group

Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy

www.cineca.it                    Tel:   +39 051 6171722

g.fatigati [AT] cineca.it