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Subject: Re: [hwloc-users] Thread core affinity
From: Brice Goglin (Brice.Goglin_at_[hidden])
Date: 2011-08-01 08:51:55


"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_at_[hidden]
> <mailto:Brice.Goglin_at_[hidden]>>
>
> 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 <http://www.cineca.it> Tel: +39 051
> 6171722
>
> g.fatigati [AT] cineca.it <http://cineca.it>