hwlocality_cudart(3)

NAME
hwlocality_cudart - Interoperability with the CUDA Runtime API

SYNOPSIS

  Functions
int hwloc_cudart_get_device_pci_ids (hwloc_topology_t topology, int idx, int *domain, int *bus, int *dev)
int hwloc_cudart_get_device_cpuset (hwloc_topology_t topology, int idx, hwloc_cpuset_t set)
hwloc_obj_t hwloc_cudart_get_device_pcidev (hwloc_topology_t topology, int idx)
hwloc_obj_t hwloc_cudart_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 Runtime API.

Function Documentation

  int hwloc_cudart_get_device_cpuset (hwloc_topology_t topology, int idx, hwloc_cpuset_t set) [inline]

Get the CPU set of processors that are physically close to device idx. Store in set the CPU-set describing the locality of the CUDA device whose index is idx.

Topology topology and device idx 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_cudart_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.

Returns
    0 on success.

    -1 on error, for instance if device information could not be found.

  hwloc_obj_t hwloc_cudart_get_device_osdev_by_index (hwloc_topology_t topology, unsigned idx) [inline]

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

Returns
    The hwloc OS device object describing the CUDA device whose index is idx.

    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 CUDA component must be enabled in the topology. If not, the locality of the object may still be found using hwloc_cudart_get_device_cpuset().

Note
    The corresponding PCI device object can be obtained by looking at the OS device parent object (unless PCI devices are filtered out).

    This function is identical to hwloc_cuda_get_device_osdev_by_index().

  int hwloc_cudart_get_device_pci_ids (hwloc_topology_t topology, int idx, int * domain, int * bus, int * dev) [inline]

Return the domain, bus and device IDs of the CUDA device whose index is idx. Device index idx must match the local machine.

Returns
    0 on success.

    -1 on error, for instance if device information could not be found.

  hwloc_obj_t hwloc_cudart_get_device_pcidev (hwloc_topology_t topology, int idx) [inline]

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

Returns
    The hwloc PCI device object describing the CUDA device whose index is idx.

    NULL if none could be found.

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

Author

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