View your GPU utilization, both for the total activity percent and individual blocks.
Requires access to /dev/dri/cardN files or /dev/mem (root privileges).
R600 and up, even Southern Islands should work fine. Works with both the open drivers and AMD Catalyst.
For the amdgpu driver, only the mem path is currently supported - for those cards, this means radeontop won't run on the default Ubuntu kernels that block /dev/mem.
The total GPU utilization is also valid for OpenCL loads; the other blocks are only useful in GL loads.
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