Function rcudnn_sys::cudaDeviceEnablePeerAccess [−][src]
pub unsafe extern "C" fn cudaDeviceEnablePeerAccess(
peerDevice: c_int,
flags: c_uint
) -> cudaError_t
Expand description
\brief Enables direct access to memory allocations on a peer device.
On success, all allocations from \p peerDevice will immediately be accessible by the current device. They will remain accessible until access is explicitly disabled using ::cudaDeviceDisablePeerAccess() or either device is reset using ::cudaDeviceReset().
Note that access granted by this call is unidirectional and that in order to access memory on the current device from \p peerDevice, a separate symmetric call to ::cudaDeviceEnablePeerAccess() is required.
Note that there are both device-wide and system-wide limitations per system configuration, as noted in the CUDA Programming Guide under the section “Peer-to-Peer Memory Access”.
Returns ::cudaErrorInvalidDevice if ::cudaDeviceCanAccessPeer() indicates that the current device cannot directly access memory from \p peerDevice.
Returns ::cudaErrorPeerAccessAlreadyEnabled if direct access of \p peerDevice from the current device has already been enabled.
Returns ::cudaErrorInvalidValue if \p flags is not 0.
\param peerDevice - Peer device to enable direct access to from the current device \param flags - Reserved for future use and must be set to 0
\return ::cudaSuccess, ::cudaErrorInvalidDevice, ::cudaErrorPeerAccessAlreadyEnabled, ::cudaErrorInvalidValue \notefnerr \note_init_rt \note_callback
\sa ::cudaDeviceCanAccessPeer, ::cudaDeviceDisablePeerAccess, ::cuCtxEnablePeerAccess