Hardware Locality (hwloc): Interoperability with the CUDA Driver API

Hardware Locality (hwloc) 1.9

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Interoperability with the CUDA Driver API

## Functions
static int | hwloc_cuda_get_device_pci_ids (hwloc_topology_t topology, CUdevice cudevice, int *domain, int *bus, int *dev)
static int | hwloc_cuda_get_device_cpuset (hwloc_topology_t topology, CUdevice cudevice, hwloc_cpuset_t set)
static hwloc_obj_t | hwloc_cuda_get_device_pcidev (hwloc_topology_t topology, CUdevice cudevice)
static hwloc_obj_t | hwloc_cuda_get_device_osdev (hwloc_topology_t topology, CUdevice cudevice)
static hwloc_obj_t | hwloc_cuda_get_device_osdev_by_index (hwloc_topology_t topology, unsigned idx)

## Detailed Description

This interface offers ways to retrieve topology information about CUDA devices when using the CUDA Driver API.

## Function Documentation

static int hwloc_cuda_get_device_cpuset | ( | hwloc_topology_t | topology,
|  | CUdevice | cudevice,
|  | hwloc_cpuset_t | set
| ) |  |
| inlinestatic

Get the CPU set of logical processors that are physically close to device `cudevice`.

Return the CPU set describing the locality of the CUDA device `cudevice`.

Topology `topology` and device `cudevice` must match the local machine. I/O devices detection and the CUDA component are not needed in the topology.

The function only returns the locality of the device. If more information about the device is needed, OS objects should be used instead, see hwloc_cuda_get_device_osdev() and hwloc_cuda_get_device_osdev_by_index().

This function is currently only implemented in a meaningful way for Linux; other systems will simply get a full cpuset.

static hwloc_obj_t hwloc_cuda_get_device_osdev | ( | hwloc_topology_t | topology,
|  | CUdevice | cudevice
| ) |  |
| inlinestatic

Get the hwloc OS device object corresponding to CUDA device `cudevice`.

Return the hwloc OS device object that describes the given CUDA device `cudevice`. Return NULL if there is none.

Topology `topology` and device `cudevice` must match the local machine. I/O devices detection and the NVML component must be enabled in the topology. If not, the locality of the object may still be found using hwloc_cuda_get_device_cpuset().

Note
  The corresponding hwloc PCI device may be found by looking at the result parent pointer.

static hwloc_obj_t hwloc_cuda_get_device_osdev_by_index | ( | hwloc_topology_t | topology,
|  | unsigned | idx
| ) |  |
| inlinestatic

Get the hwloc OS device object corresponding to the CUDA device whose index is `idx`.

Return the OS device object describing the CUDA device whose index is `idx`. Return NULL if there is none.

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 CUDA component must be enabled in the topology.

Note
  The corresponding PCI device object can be obtained by looking at the OS device parent object.
  This function is identical to hwloc_cudart_get_device_osdev_by_index().

static int hwloc_cuda_get_device_pci_ids | ( | hwloc_topology_t | topology,
|  | CUdevice | cudevice,
|  | int * | domain,
|  | int * | bus,
|  | int * | dev
| ) |  |
| inlinestatic

Return the domain, bus and device IDs of the CUDA device `cudevice`.

Device `cudevice` must match the local machine.

static hwloc_obj_t hwloc_cuda_get_device_pcidev | ( | hwloc_topology_t | topology,
|  | CUdevice | cudevice
| ) |  |
| inlinestatic

Get the hwloc PCI device object corresponding to the CUDA device `cudevice`.

Return the PCI device object describing the CUDA device `cudevice`. Return NULL if there is none.

Topology `topology` and device `cudevice` must match the local machine. I/O devices detection must be enabled in topology `topology`. The CUDA component is not needed in the topology.