I sometimes have an issue where something decides to take up 100% of my GPUs clock cycles. Activity Monitor only shows this as a solid block of usage in the activity monitor, but it doesn't give me any information as to who's using it.
With Nvidia/CUDA, I could use
nvidia-smi to tell me this, but I cannot find any equivalent on OS-X.
How do I tell what's using the GPU?
I have the rMBP with the AMD Radeon Pro 560 and an external AMD Radeon RX 570. I didn't have the activity monitor open the last time this happened, but the last time I had the symptoms it was the 560.