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Showing content from http://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__PEER.html below:

CUDA Runtime API :: CUDA Toolkit Documentation

6.14. Peer Device Memory Access

This section describes the peer device memory access functions of the CUDA runtime application programming interface.

Functions
__host__ ​cudaError_t cudaDeviceCanAccessPeer ( int* canAccessPeer, int  device, int  peerDevice )
Queries if a device may directly access a peer device's memory.
__host__ ​cudaError_t cudaDeviceDisablePeerAccess ( int  peerDevice )
Disables direct access to memory allocations on a peer device.
__host__ ​cudaError_t cudaDeviceEnablePeerAccess ( int  peerDevice, unsigned int  flags )
Enables direct access to memory allocations on a peer device.
Functions
__host__ ​cudaError_t cudaDeviceCanAccessPeer ( int* canAccessPeer, int  device, int  peerDevice )

Queries if a device may directly access a peer device's memory.

Parameters
canAccessPeer
- Returned access capability
device
- Device from which allocations on peerDevice are to be directly accessed.
peerDevice
- Device on which the allocations to be directly accessed by device reside.
__host__ ​cudaError_t cudaDeviceDisablePeerAccess ( int  peerDevice )

Disables direct access to memory allocations on a peer device.

Parameters
peerDevice
- Peer device to disable direct access to
__host__ ​cudaError_t cudaDeviceEnablePeerAccess ( int  peerDevice, unsigned int  flags )

Enables direct access to memory allocations on a peer device.

Parameters
peerDevice
- Peer device to enable direct access to from the current device
flags
- Reserved for future use and must be set to 0

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