hwlocality_gl(3) Library Functions Manual hwlocality_gl(3)
NAME
hwlocality_gl - Interoperability with OpenGL displays
SYNOPSIS
Functions
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)
Detailed Description
This interface offers ways to retrieve topology information about
OpenGL displays.
Only the NVIDIA display locality information is currently available,
using the NV-CONTROL X11 extension and the NVCtrl library.
Function Documentation
int hwloc_gl_get_display_by_osdev (hwloc_topology_t topology, hwloc_obj_t
osdev, unsigned * port, unsigned * device) [inline]
Get the OpenGL display port and device corresponding to the given hwloc
OS object. Retrieves the OpenGL display port (server) in port and
device (screen) in screen that correspond to the given hwloc OS device
object.
Returns
0 on success.
-1 if none could be found.
The topology topology does not necessarily have to match the current
machine. For instance the topology may be an XML import of a remote
host. I/O devices detection and the GL component must be enabled in the
topology.
hwloc_obj_t hwloc_gl_get_display_osdev_by_name (hwloc_topology_t topology,
const char * name) [inline]
Get the hwloc OS device object corresponding to the OpenGL display
given by name.
Returns
The hwloc OS device object describing the OpenGL display whose name
is name, built as ':port.device' such as ':0.0' .
NULL if none could be found.
The topology topology does not necessarily have to match the current
machine. For instance the topology may be an XML import of a remote
host. I/O devices detection and the GL component must be enabled in the
topology.
Note
The corresponding PCI device object can be obtained by looking at
the OS device parent object (unless PCI devices are filtered out).
hwloc_obj_t hwloc_gl_get_display_osdev_by_port_device (hwloc_topology_t
topology, unsigned port, unsigned device) [inline]
Get the hwloc OS device object corresponding to the OpenGL display
given by port and device index.
Returns
The hwloc OS device object describing the OpenGL display whose port
(server) is port and device (screen) is device.
NULL if none could be found.
The topology topology does not necessarily have to match the current
machine. For instance the topology may be an XML import of a remote
host. I/O devices detection and the GL component must be enabled in the
topology.
Note
The corresponding PCI device object can be obtained by looking at
the OS device parent object (unless PCI devices are filtered out).
Author
Generated automatically by Doxygen for Hardware Locality (hwloc) from
the source code.
Hardware Locality (hwloc) Version 2.12.0 hwlocality_gl(3)
hwloc 2.12.0 - Generated Thu May 8 15:32:24 CDT 2025