Re: [Starpu-devel] hwloc CUDA plugin missing

[Alfredo Buttari <alfredo.buttari@enseeiht.fr>]

yes it does. I am actually on a sirocco node of plafrim using module hardware/hwloc/2.0.3 so you can try it yourself. The reason I am asking is that I'm trying to figure out how proxylists are built in the lws scheduler and I cannot make any sense of what I see. Here is an example that prints the proxylist for each CUDA worker (workids from 0 to 3)

CUDA --  workid: 0   bindid:20   type:8

 0, 1,  2,  3, 22, 23, 16, 17, 18, 19, 20, 21,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15

CUDA --  workid: 1   bindid:21   type:8

 1,  2,  3, 22, 23,  0, 16, 17, 18, 19, 20, 21,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15

CUDA --  workid: 2   bindid:22   type:8

 2,  3, 22, 23,  0,  1, 16, 17, 18, 19, 20, 21,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15

CUDA --  workid: 3   bindid:23   type:8

 3, 22, 23,  0,  1,  2, 16, 17, 18, 19, 20, 21,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15

(here workids 4-23 are CPUs).

For example I do not understand why wid 1 is the closest worker to wid 0 but not the other way around. 

I thought the warning message was related to a problem which can explain this.

On Thu, Feb 7, 2019 at 3:02 PM Samuel Thibault <samuel.thibault@inria.fr> wrote:

Alfredo Buttari, le jeu. 07 févr. 2019 14:04:11 +0100, a ecrit:
> [starpu][_starpu_init_machine_config] Warning: could not find location of
> CUDA0, do you have the hwloc CUDA plugin installed?
>
> hwloc is installed on my system with static CUDA support and not through a
> plugin because ltdl is not available. Is there anything I can do to get around
> this problem?

Mmm, having cuda support statically built in shouldn't be posing
problem, it's odd that you get the warning. Does lstopo show the GPUs?

That being said, we are not really making much use of the information
yet, so I have lowered the visibility of this warning.

Samuel

--

-----------------------------------------
Alfredo Buttari, PhD
CNRS-IRIT
2 rue Camichel, 31071 Toulouse, France
http://buttari.perso.enseeiht.fr