NVIDIA offers a library called GDRcopy which "is a low-latency GPU memory copy library based on GPUDirect RDMA technology that allows the CPU to directly map and access GPU memory". Where GPUDirect RDMA "enables a direct path for data exchange between the GPU and a third-party peer device using standard features of PCI Express". The AMD equivalent of this is/was DirectGMA (or more precisely, the functionality enabled by the cl_amd_bus_addressable_memory flag). So my question is: does AMD offer anything like this for it's GPUs?
