Open MPI logo

Hardware Locality Users' Mailing List Archives

  |   Home   |   Support   |   FAQ   |  

This web mail archive is frozen.

This page is part of a frozen web archive of this mailing list.

You can still navigate around this archive, but know that no new mails have been added to it since July of 2016.

Click here to be taken to the new web archives of this list; it includes all the mails that are in this frozen archive plus all new mails that have been sent to the list since it was migrated to the new archives.

Subject: Re: [hwloc-users] Bind current thread to a specific cpu
From: PULVERAIL Sébastien (sebastien.pulverail_at_[hidden])
Date: 2011-08-18 05:48:12

I use logical ids, so I do this :


                hwloc_obj_t cpu = hwloc_get_obj_by_type(topology,

                int err = hwloc_set_cpubind(topology, cpu->cpuset,


Is it correct ?

De : hwloc-users-bounces_at_[hidden]
[mailto:hwloc-users-bounces_at_[hidden]] De la part de Brice Goglin
Envoyé : jeudi 18 août 2011 10:25
À : Hardware locality user list
Objet : Re: [hwloc-users] Bind current thread to a specific cpu
Are you talking about logical ids (the one given by hwloc) or physical/OS
ids (the one given by the OS and possibly in strange order) ? You should
avoid using physical ids, but...
If logical, you can hwloc_get_obj_by_type() to get the corresponding object,
then use its ->cpuset.
If physical, you just need a cpuset that contains the bit corresponding to
this id. You can use hwloc_bitmap_only(set, <id>) to reset a (previously
allocated) cpuset to nothing but this id.
Le 18/08/2011 10:10, PULVERAIL Sébastien a écrit : 
I’m looking for a function that allows to bind the current thread to a
specific cpu given by its id.
I found the function hwloc_set_thread_cpubind to bind a thread to a cpuset.
I also found the function hwloc_bitmap_singlify to keep only one index in
the cpuset.
But I didn’t found anything to only keep the cpu I need in my cpuset…
Is it possible ? 
hwloc-users mailing list