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Subject: Re: [hwloc-users] OpenGL GPU detection code
From: Kenneth A. Lloyd (kenneth.lloyd_at_[hidden])
Date: 2013-02-12 18:34:53

Sorry, no. Came down with the flu. (My wife likes to share.) Hopefully,
will try it in the next couple of days.

Ken Lloyd

-----Original Message-----
From: hwloc-users-bounces_at_[hidden]
[mailto:hwloc-users-bounces_at_[hidden]] On Behalf Of Brice Goglin
Sent: Tuesday, February 12, 2013 3:38 PM
To: Stefan Eilemann
Cc: Hardware locality user list
Subject: Re: [hwloc-users] OpenGL GPU detection code

Stefan (or anybody else interested in hwloc GPU support), Did you have any
chance to look at this?

Le 01/02/2013 14:57, Brice Goglin a écrit :
> I just committed big changes to the display branch (and I also merged
> latest trunk changes).
> lstopo will now report things like this:
> PCI 10de:06d1
> GPU L#0 ":0.0"
> GPU L#1 "cuda0"
> GPU L#2 "nvml0"
> The changes include:
> 1) We don't have a "display" specific OS device anymore, it's just
> another kind of GPU among cuda, opencl and nvml. The name is the X
> server display name. There are string attributes in these new GL GPU
> OS devices (lstopo -v):
> GPU L#9 (Backend=GL GPUVendor="NVIDIA Corporation" GPUModel="Tesla
> C2050") ":0.2"
> 2) The gl component is now buildable as a plugin
> 3) Given (2), we can't expose internal GL routines in the public API.
> So hwloc/gl.h is just made of inline helpers as any other hwloc/foo.h.
> It now contains functions to convert between displays (name or
> port/device) and hwloc OS devices:
> hwloc_obj_t hwloc_gl_get_display_osdev_by_port_device(hwloc_topology_t
> topology, unsigned port, unsigned device) hwloc_obj_t
> hwloc_gl_get_display_osdev_by_name(hwloc_topology_t
> topology, const char *name)
> int hwloc_gl_get_display_by_osdev(hwloc_topology_t topology,
> hwloc_obj_t osdev,unsigned *port, unsigned *device)
> If you really need the PCI device, just use osdev->parent as documented.
> If you need the locality, use hwloc_get_non_io_ancestor(topology,
> osdev)->cpuset
> See tests/gl.c for examples.
> Please review hwloc/gl.h and let me know if that works for you. I hope
> I used the words port/device/server/screen as expected.
> The last thing on my TODO list is to decide is whether we keep the "GL"
> name or switch to something among display/X11/X/... for filenames and
> function names.
> Brice

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