This is a fork of the project https://github.com/marwan-abdellah/nvgpu-snmp which instead of using the NV-CONTROL X extension to retrieve data make a call to the nVidia binary nvidia-smi. The biggest advantage of this approach is that the snmp daemon does not need access to the X display.
radeontop lets you view GPU utilization on open Radeon drivers. Both the total usage and per-block usage are shown. All cards starting with R600 are supported.