Peer to peer device memory access#
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hipError_t hipDeviceCanAccessPeer(int *canAccessPeer, int deviceId, int peerDeviceId)#
Determine if a device can access a peer’s memory.
Returns “1” in
canAccessPeer
if the specifieddevice
is capable of directly accessing memory physically located on peerDevice , or “0” if not.Returns “0” in
canAccessPeer
if deviceId == peerDeviceId, and both are valid devices : a device is not a peer of itself.- Parameters:
canAccessPeer – [out] Returns the peer access capability (0 or 1)
deviceId – [in] - device from where memory may be accessed.
peerDeviceId – [in] - device where memory is physically located
- Returns:
hipSuccess,
- Returns:
hipErrorInvalidDevice if deviceId or peerDeviceId are not valid devices
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hipError_t hipDeviceEnablePeerAccess(int peerDeviceId, unsigned int flags)#
Enable direct access from current device’s virtual address space to memory allocations physically located on a peer device.
Memory which already allocated on peer device will be mapped into the address space of the current device. In addition, all future memory allocations on peerDeviceId will be mapped into the address space of the current device when the memory is allocated. The peer memory remains accessible from the current device until a call to hipDeviceDisablePeerAccess or hipDeviceReset.
Returns hipSuccess, hipErrorInvalidDevice, hipErrorInvalidValue,
- Parameters:
peerDeviceId – [in] Peer device to enable direct access to from the current device
flags – [in] Reserved for future use, must be zero
- Returns:
hipErrorPeerAccessAlreadyEnabled if peer access is already enabled for this device.
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hipError_t hipDeviceDisablePeerAccess(int peerDeviceId)#
Disable direct access from current device’s virtual address space to memory allocations physically located on a peer device.
Returns hipErrorPeerAccessNotEnabled if direct access to memory on peerDevice has not yet been enabled from the current device.
- Parameters:
peerDeviceId – [in] Peer device to disable direct access to
- Returns:
hipSuccess, hipErrorPeerAccessNotEnabled
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hipError_t hipMemGetAddressRange(hipDeviceptr_t *pbase, size_t *psize, hipDeviceptr_t dptr)#
Get information on memory allocations.
See also
hipCtxCreate, hipCtxDestroy, hipCtxGetFlags, hipCtxPopCurrent, hipCtxGetCurrent, hipCtxSetCurrent, hipCtxPushCurrent, hipCtxSetCacheConfig, hipCtxSynchronize, hipCtxGetDevice
- Parameters:
pbase – [out] - BAse pointer address
psize – [out] - Size of allocation
dptr- – [in] Device Pointer
- Returns:
hipSuccess, hipErrorNotFound
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USE_PEER_NON_UNIFIED#