NAME

       Peer Context Memory Access -

   Functions
       CUresult cuCtxDisablePeerAccess (CUcontext peerContext)
           Disables direct access to memory allocations in a peer context and unregisters any registered
           allocations.
       CUresult cuCtxEnablePeerAccess (CUcontext peerContext, unsigned int Flags)
           Enables direct access to memory allocations in a peer context.
       CUresult cuDeviceCanAccessPeer (int *canAccessPeer, CUdevice dev, CUdevice peerDev)
           Queries if a device may directly access a peer device's memory.

Detailed Description

       \brief direct peer context memory access functions of the low-level CUDA driver API (cuda.h)

       This section describes the direct peer context memory access functions of the low-level CUDA driver
       application programming interface.

Function Documentation

   CUresult cuCtxDisablePeerAccess (CUcontext peerContext)
       Returns CUDA_ERROR_PEER_ACCESS_NOT_ENABLED if direct peer access has not yet been enabled from
       peerContext to the current context.

       Returns CUDA_ERROR_INVALID_CONTEXT if there is no current context, or if peerContext is not a valid
       context.

       Parameters:
           peerContext - Peer context to disable direct access to

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED,
           CUDA_ERROR_PEER_ACCESS_NOT_ENABLED, CUDA_ERROR_INVALID_CONTEXT,

       Note:
           Note that this function may also return error codes from previous, asynchronous launches.

       See also:
           cuDeviceCanAccessPeer, cuCtxEnablePeerAccess

   CUresult cuCtxEnablePeerAccess (CUcontext peerContext, unsigned int Flags)
       If both the current context and peerContext are on devices which support unified addressing (as may be
       queried using CU_DEVICE_ATTRIBUTE_UNIFIED_ADDRESSING) and same major compute capability, then on success
       all allocations from peerContext will immediately be accessible by the current context. See Unified
       Addressing for additional details.

       Note that access granted by this call is unidirectional and that in order to access memory from the
       current context in peerContext, a separate symmetric call to cuCtxEnablePeerAccess() is required.

       There is a system-wide maximum of eight peer connections per device.

       Returns CUDA_ERROR_PEER_ACCESS_UNSUPPORTED if cuDeviceCanAccessPeer() indicates that the CUdevice of the
       current context cannot directly access memory from the CUdevice of peerContext.

       Returns CUDA_ERROR_PEER_ACCESS_ALREADY_ENABLED if direct access of peerContext from the current context
       has already been enabled.

       Returns CUDA_ERROR_TOO_MANY_PEERS if direct peer access is not possible because hardware resources
       required for peer access have been exhausted.

       Returns CUDA_ERROR_INVALID_CONTEXT if there is no current context, peerContext is not a valid context, or
       if the current context is peerContext.

       Returns CUDA_ERROR_INVALID_VALUE if Flags is not 0.

       Parameters:
           peerContext - Peer context to enable direct access to from the current context
           Flags - Reserved for future use and must be set to 0

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED,
           CUDA_ERROR_PEER_ACCESS_ALREADY_ENABLED, CUDA_ERROR_TOO_MANY_PEERS, CUDA_ERROR_INVALID_CONTEXT,
           CUDA_ERROR_PEER_ACCESS_UNSUPPORTED, CUDA_ERROR_INVALID_VALUE

       Note:
           Note that this function may also return error codes from previous, asynchronous launches.

       See also:
           cuDeviceCanAccessPeer, cuCtxDisablePeerAccess

   CUresult cuDeviceCanAccessPeer (int * canAccessPeer, CUdevice dev, CUdevice peerDev)
       Returns in *canAccessPeer a value of 1 if contexts on dev are capable of directly accessing memory from
       contexts on peerDev and 0 otherwise. If direct access of peerDev from dev is possible, then access may be
       enabled on two specific contexts by calling cuCtxEnablePeerAccess().

       Parameters:
           canAccessPeer - Returned access capability
           dev - Device from which allocations on peerDev are to be directly accessed.
           peerDev - Device on which the allocations to be directly accessed by dev reside.

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_DEVICE

       Note:
           Note that this function may also return error codes from previous, asynchronous launches.

       See also:
           cuCtxEnablePeerAccess, cuCtxDisablePeerAccess

Author

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Version 6.0                                        15 Aug 2015                     Peer Context Memory Access(3)