For the most part Rosetta does not use the GPU. There are some isolated features which have GPU support, but the vast majority of computation in most Rosetta protocols is CPU only. So I’m not surprised that an arbitrary RosettaScript shows no activity on the GPU.
(If there’s a particular mover/filter/etc. which you believe from reading the documentation should have GPU support but doesn’t seem to be using it, then we can look into it, but unless the documentation explicitly mentions GPU support, I would assume that things in Rosetta are CPU only.)
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