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In the concurrent examples you might notice the use of hipMemcpy3DAsync to copy wavefields as planes back to the 3D host memory allocation out_h. This is because using hipMemcpyAsync to copy device memory to an address within a pinned memory allocation failed silently and produced faulty copies. Therefore it is not recommended to perform asychronous copies with pointers derived from within a pinned memory allocation. Only use the pointer returned by hipHostMalloc with asynchronous copy functions.