- add P2P staging buffer copy.
- If copy device does not have sufficient access permissions, fall back
to staging buffer.
- improve docs for which copy device is used.
[ROCm/hip commit: dcabc9dbf7]
- set USE_PEER_TO_PEER=3 (requires HCC "am_memtracker_update_peers")
- when enabling peer, turn it on for previously allocated memory.
- hipDeviceCanAccessPeer is no longer self-ware (self does not qualify
as a peer)
- device peerlist always includes self, so when we call allow_access
we never remove self access.
- hipDeviceReset() removes old peer mappings.
[ROCm/hip commit: 83f0de7806]
- Ensure proper device is set before each command.
- Add command line switches:
+bool p_memcpyWithPeer = false; // use the peer device for the P2P copy
+bool p_mirrorPeers = false; // in addition to mapping current to peer
space, map peer to current space.
+int p_peerDevice = -1; // explicly specify which peer to use, else
use p_gpuDevice + 1.
[ROCm/hip commit: c2d37b4bbd]
Ben Sander